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Columns in Blazor Tree Grid component

The column definitions are used as the datasource schema in the Tree Grid. This plays a vital role in rendering column values in the required format. The tree grid operations such as sorting, filtering and searching etc. are performed based on column definitions. The Field property of TreeGridColumns tag helper is necessary to map the data source values in Tree Grid columns.

If the column Field is not specified in the dataSource, the column values will be empty.

If the Field name contains dot operator, it is considered as complex binding.

TreeColumnIndex property denotes the column that is used to expand and collapse child rows.

Header template

You can customize the header element by using the HeaderTemplate property.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid ModelType="@model" Height="400" DataSource="@TreeGridData" IdMapping="EmployeeID" ParentIdMapping="ParentId" TreeColumnIndex="0">
    <TreeGridColumns>
        <TreeGridColumn Field="Name" HeaderText="Name" Width="160">
            <HeaderTemplate>
                    <div>
                        <span class="e-icon-userlogin e-icons employee"></span> Name
                    </div>
            </HeaderTemplate>
        </TreeGridColumn>
        <TreeGridColumn Field="Designation" HeaderText="Designation" Width="120"></TreeGridColumn>
        <TreeGridColumn Field="EmpID" HeaderText="Progress" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Country" HeaderText="Priority" Width="100"></TreeGridColumn>
        </TreeGridColumns>
</SfTreeGrid>

<style>

    @@font-face {
        font-family: 'ej2-headertemplate';
        src: url(data:application/x-font-ttf;charset=utf-8;base64,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) format('truetype');
        font-weight: normal;
        font-style: normal;
    }

    .e-grid .e-icon-userlogin::before {
        font-family: 'ej2-headertemplate';
        width: 15px !important;
        content: '\e702';
    }

    .e-grid .e-icon-calender::before {
        font-family: 'ej2-headertemplate';
        width: 15px !important;
        content: '\e960';
    }
</style>


@code{
    public Employee model = new Employee();
    public IEnumerable<Employee> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = Employee.GetTemplateData();
    }
}

namespace TreeGridComponent.Data {

public class Employee
    {
        public string Name { get; set; }
        public string Designation { get; set; }
        public string EmpID { get; set; }
        public string Contact { get; set; }
        public int? ParentId { get; set; }
        public TreeData Treedata { get; set; }

        public static List<Employee> GetTemplateData()
        {
            List<Employee> DataCollection = new List<Employee>();
            DataCollection.Add(new Employee { Name = "Robert King",Designation = "Chief Executive Officer",EmpID = "EMP001",Country = "USA",ParentId = null,Treedata = new TreeData() { ID = 21}});
            DataCollection.Add(new Employee { Name = "David william",Designation = "Vice President",EmpID = "EMP004",Country = "USA",ParentId = 1,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Nancy Davolio",Designation = "Marketing Executive",EmpID = "EMP035",Country = "USA",ParentId = 1,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Andrew Fuller",Designation = "Sales Representative",EmpID = "EMP045",Country = "UK",ParentId = 1,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Anne Dodsworth",FullName = "AnneDodsworth",Designation = "Sales Representative",EmployeeID = 5,EmpID = "EMP091",Country = "USA",ParentId = null,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Michael Suyama",FullName = "MichaelSuyama",Designation = "Sales Representative",EmployeeID = 6,EmpID = "EMP110",Country = "UK",ParentId = 5,Treedata = new TreeData() { ID = 21 }});
            return DataCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Header Template

For Templated Tree Grid component, ModelType property of Tree Grid should be defined.

Header text

By default, column header title is displayed from column Field value. To override the default header title, you have to define the HeaderText value.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="160"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Priority" HeaderText="Priority" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{

    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public string Priority { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",Progress = 80,Priority = "Low",ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Critical",ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",Duration = 6,Priority = "High",Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",Duration = 4,Progress = 80,Priority = "Critical",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Low",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",Duration = 6,Progress = 77,Priority = "High",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",Duration = 6,Progress = 77,Priority = "Low",ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Header Text

If both the Field and HeaderText are not defined in the column, the column renders with empty header text.

Format

To format cell values based on specific culture, use the Format property of TreeGridColumns tag helper. The Tree Grid uses Internalization library to format the number values.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" >
    <TreeGridColumns>
        <TreeGridColumn Field="OrderID" HeaderText="Order ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="OrderName" HeaderText="Order Name" Width="160"></TreeGridColumn>
        <TreeGridColumn Field="Price" HeaderText="Price" Width="100" Format="C2" Type="Syncfusion.Blazor.Grids.ColumnType.Number" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{

    public List<TreeDataFormat> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeDataFormat.GetDataFormat().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeDataFormat
{
    public TreeDataFormat() { }
    public int OrderID { get; set; }
    public string OrderName { get; set; }
    public double Price { get; set; }
    public int? ParentId { get; set; }
    
    public static List<TreeDataFormat> GetDataFormat()
    {
        List<TreeDataFormat> data = new List<TreeDataFormat>()
            {
                new TreeDataFormat() { OrderID= 1,OrderName= "Order 1",ParentId = null,Price=133.66 },
                new TreeDataFormat() { OrderID= 11, ParentId = 1, OrderName= "Mackerel", Price= 28.20},
                new TreeDataFormat() { OrderID= 12, ParentId = 1, OrderName= "Mackerel", Price= 25.92},
                new TreeDataFormat() { OrderID= 13, ParentId = 1, OrderName= "Mackerel", Price= 52.68},
                new TreeDataFormat() { OrderID= 14, ParentId = 1, OrderName= "Mackerel", Price= 11.25},
                new TreeDataFormat() { OrderID= 15, ParentId = 1, OrderName= "Mackerel", Price= 15.61},
                new TreeDataFormat() { OrderID= 2,OrderName= "Order 2",ParentId = null,Price=212.33},
                new TreeDataFormat() { OrderID= 21, ParentId = 2, OrderName= "Tilapias",Price= 55.50},
                new TreeDataFormat() { OrderID= 22, ParentId = 2, OrderName= "White Shrimp", Price= 41.70},
                new TreeDataFormat() { OrderID= 23, ParentId = 2, OrderName= "Fresh Cheese",Price= 39.20},
                new TreeDataFormat() { OrderID= 24, ParentId = 2, OrderName= "Blue Veined Cheese",Price= 38.76},
                new TreeDataFormat() { OrderID= 25, ParentId = 2, OrderName= "Butter", Price= 37.17}};
        return data;
    }
}
}

By default, the number and date values are formatted in en-US locale.

Number formatting

The number or integer values can be formatted using the below format strings.

Format	Description	Remarks
N	Denotes numeric type.	The numeric format is followed by integer value as N2, N3. etc which denotes the number of precision to be allowed.
C	Denotes currency type.	The currency format is followed by integer value as C2, C3. etc which denotes the number of precision to be allowed.
P	Denotes percentage type	The percentage format expects the input value to be in the range of 0 to 100. For example the cell value 0.2 is formatted as 20%. The percentage format is followed by integer value as P2, P3. etc which denotes the number of precision to be allowed.

Date formatting

You can format date values using built-in date format string.

For built-in date format you can specify Format property as string (Example: d).

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" >
    <TreeGridColumns>
        <TreeGridColumn Field="OrderID" HeaderText="Order ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="OrderName" HeaderText="Order Name" Width="160"></TreeGridColumn>
        <TreeGridColumn Field="OrderDate" HeaderText="Order Date" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="160"></TreeGridColumn>
        <TreeGridColumn Field="Price" HeaderText="Price" Width="100" Format="C2" Type="Syncfusion.Blazor.Grids.ColumnType.Number" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{

    public List<TreeDataFormat> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeDataFormat.GetDataFormat().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeDataFormat
{
    public TreeDataFormat() { }
    public int OrderID { get; set; }
    public string OrderName { get; set; }
    public double Price { get; set; }
    public int? ParentId { get; set; }
    
    public static List<TreeDataFormat> GetDataFormat()
    {
        List<TreeDataFormat> data = new List<TreeDataFormat>()
            {
                new TreeDataFormat() { OrderID= 1,OrderName= "Order 1",ParentId = null,Price=133.66 },
                new TreeDataFormat() { OrderID= 11, ParentId = 1, OrderName= "Mackerel", Price= 28.20},
                new TreeDataFormat() { OrderID= 12, ParentId = 1, OrderName= "Mackerel", Price= 25.92},
                new TreeDataFormat() { OrderID= 13, ParentId = 1, OrderName= "Mackerel", Price= 52.68},
                new TreeDataFormat() { OrderID= 14, ParentId = 1, OrderName= "Mackerel", Price= 11.25},
                new TreeDataFormat() { OrderID= 15, ParentId = 1, OrderName= "Mackerel", Price= 15.61},
                new TreeDataFormat() { OrderID= 2,OrderName= "Order 2",ParentId = null,Price=212.33},
                new TreeDataFormat() { OrderID= 21, ParentId = 2, OrderName= "Tilapias",Price= 55.50},
                new TreeDataFormat() { OrderID= 22, ParentId = 2, OrderName= "White Shrimp", Price= 41.70},
                new TreeDataFormat() { OrderID= 23, ParentId = 2, OrderName= "Fresh Cheese",Price= 39.20},
                new TreeDataFormat() { OrderID= 24, ParentId = 2, OrderName= "Blue Veined Cheese",Price= 38.76},
                new TreeDataFormat() { OrderID= 25, ParentId = 2, OrderName= "Butter", Price= 37.17}};
        return data;
    }
}
}

The following output is displayed as a result of the above code example.

Date Format

AutoFit specific columns

The AutoFitColumns method resizes the column to fit the widest cell’s content without wrapping. You can autofit a specific column at initial rendering by invoking the AutoFitColumns method in DataBound event.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid @ref="TreeGrid" DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1">
    <TreeGridEvents DataBound="OnDataBound" TValue="TreeData.BusinessObject"></TreeGridEvents>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="160"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Priority" HeaderText="Priority" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    SfTreeGrid<TreeData.BusinessObject> TreeGrid;

    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }

    private void OnDataBound(object e)
    {
        this.TreeGrid.AutoFitColumns(new List<string>() { "TaskName" });
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public string Priority { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",Progress = 80,Priority = "Low",ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Critical",ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",Duration = 6,Priority = "High",Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",Duration = 4,Progress = 80,Priority = "Critical",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Low",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",Duration = 6,Progress = 77,Priority = "High",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",Duration = 6,Progress = 77,Priority = "Low",ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

AutoFit Columns

You can autofit all the columns by invoking the AutoFitColumns method without column names.

Reorder

Reordering can be done by drag and drop of a particular column header from one index to another index within the treegrid. To enable reordering, set the AllowReordering to true.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowReordering="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90"></TreeGridColumn>
        <TreeGridColumn  Field="Duration" HeaderText="Duration" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

You can disable reordering a particular column by setting the AllowReordering property of TreeGridColumns tag helper to false.

Reorder multiple columns

Multiple columns can be reordered at a time by using the ReorderColumns method.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<button id="reorderMultipleCols" @onclick="click">Reorder</button>

<SfTreeGrid @ref="TreeGrid" IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowReordering="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    SfTreeGrid<TreeData.BusinessObject> TreeGrid;
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
    private void click()
    {
        this.TreeGrid.ReorderColumns(new List<string>() { "TaskId", "Duration" }, "Progress");
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Progress = 80,ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,Progress = 80,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

Lock columns

You can lock columns by using LockColumn property. The locked columns will be moved to the first position. Also you can’t reorder its position.

In the below example, Duration column is locked and its reordering functionality is disabled.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowReordering="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Duration" LockColumn="true" HeaderText="Duration" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,Progress = 80,ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,Progress = 80,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Lock Columns

Column resizing

Column width can be resized by clicking and dragging the right edge of the column header. While dragging, the width of the respective column will be resized immediately. Each column can be auto resized by double-clicking the right edge of the column header to fit the width of that column based on the widest cell content. To enable column resize, set the AllowResizing property to true.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowResizing="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Duration" LockColumn="true" HeaderText="Duration" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Progress = 80,ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,Progress = 80,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

You can disable resizing for a particular column by setting the AllowResizing property of TreeGridColumns tag helper to false.

In RTL mode, you can click and drag the left edge of the header cell to resize the column.

Min and max width

Column resize can be restricted between minimum and maximum width by defining the MinWidth and MaxWidth properties of TreeGridColumns tag helper.

In the following sample, minimum and maximum width are defined for Duration, and Task Name columns.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowResizing="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" MinWidth="170" MaxWidth="250" Width="180"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" MinWidth="50" MaxWidth="150" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",Progress = 80,Priority = "Low",ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Critical",ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",Duration = 6,Priority = "High",Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",Duration = 4,Progress = 80,Priority = "Critical",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Low",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",Duration = 6,Progress = 77,Priority = "High",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",Duration = 6,Progress = 77,Priority = "Low",ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

Resize stacked column

Stacked columns can be resized by clicking and dragging the right edge of the stacked column header. While dragging, the width of the respective child columns will be resized at the same time. You can disable resize for particular stacked column by setting AllowResizing as false to its columns.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowResizing="true">
    <TreeGridColumns>
        <TreeGridColumn HeaderText="Order Details" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Columns="@( new List<TreeGridColumn>() {
               new TreeGridColumn { Field = "ID", Width = "110", HeaderText = "Order ID", TextAlign= Syncfusion.Blazor.Grids.TextAlign.Right  },
               new TreeGridColumn { Field = "Name", Width = "220", HeaderText = "Order Name",  TextAlign= Syncfusion.Blazor.Grids.TextAlign.Left },
               new TreeGridColumn { Field = "OrderDate", Width = "120", HeaderText = "Order Date",  TextAlign= Syncfusion.Blazor.Grids.TextAlign.Right, Format="yMd", Type="Syncfusion.Blazor.Grids.ColumnType.Date" }} )">
        </TreeGridColumn>
        <TreeGridColumn HeaderText="Shipment Details" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Center" Columns="@( new List<TreeGridColumn>() {
               new TreeGridColumn { Field = "ShipmentCategory", Width = "170", HeaderText = "Shipment Category" },
               new TreeGridColumn { Field = "ShippedDate", Width = "140", Format="yMd", HeaderText = "Shipment Date", Type="Syncfusion.Blazor.Grids.ColumnType.Date", TextAlign= Syncfusion.Blazor.Grids.TextAlign.Right },
               new TreeGridColumn { Field = "Units", Width = "90", HeaderText = "Units", TextAlign= Syncfusion.Blazor.Grids.TextAlign.Right }} )">
        </TreeGridColumn>
        <TreeGridColumn HeaderText="Price Details" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Center" Columns="@( new List<TreeGridColumn>() {
               new TreeGridColumn { Field = "UnitPrice", Width = "180", HeaderText = "Price per unit", Format = "C2", Type="Syncfusion.Blazor.Grids.ColumnType.Number", TextAlign= Syncfusion.Blazor.Grids.TextAlign.Right },
               new TreeGridColumn { Field = "Price", HeaderText = "Total Price", Width="160", Format="C", Type="Syncfusion.Blazor.Grids.ColumnType.Number", TextAlign= Syncfusion.Blazor.Grids.TextAlign.Right }} )">
        </TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>


@code{
    public List<ShipmentData> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = ShipmentData.GetShipmentData().ToList();
    }
}

namespace TreeGridComponent.Data {

public class ShipmentData
{
    public int ID { get; set; }
    public string Name { get; set; }
    public int Units { get; set; }
    public string Category { get; set; }
    public int UnitPrice { get; set; }
    public int Price { get; set; }
    public int? ParentID { get; set; }
    public string ShipmentCategory { get; set; }
    public DateTime ShippedDate { get; set; }
    public DateTime OrderDate { get; set; }
    public List<ShipmentData> Children { get; set; }

    public static List<ShipmentData> GetShipmentData()
    {
        List<ShipmentData> DataCollection = new List<ShipmentData>() {

        new ShipmentData() { ID = 1,Name = "Order 1",Categoy = "Seafood",Units = 1395,UnitPrice = 47,Price = 65565,ParentID = null,OrderDate = new DateTime(2017, 3, 2),ShippedDate = new DateTime(2017, 9, 2),ShipmentCategory = "Seafood"},
        new ShipmentData() { ID = 11,Name = "Mackerel",Category = "Frozen Seafood",Units = 235,UnitPrice = 12,Price = 2820,ParentID = 1,OrderDate = new DateTime(2017, 3, 3),ShippedDate = new DateTime(2017, 10, 3),ShipmentCategory = "Frozen Seafood"},
        new ShipmentData() { ID = 12,Name = "Yellowfin Tuna",Category = "Frozen Seafood",Units = 324,UnitPrice = 8,Price = 2592,ParentID = 1,OrderDate = new DateTime(2017, 3, 5),ShippedDate = new DateTime(2017, 10, 5),ShipmentCategory = "Frozen Seafood"},
        new ShipmentData() { ID = 13,Name = "Herrings",Category = "Frozen Seafood",Units = 488,UnitPrice = 11,Price = 5368,ParentID = 1,OrderDate = new DateTime(2017, 8, 5),ShippedDate = new DateTime(2017, 5, 15),ShipmentCategory = "Frozen Seafood"},
        new ShipmentData() { ID = 14,Name = "Preserved Olives",Category = "Edible",Units = 125,UnitPrice = 9,Price = 1125,ParentID = 1,OrderDate = new DateTime(2017, 6, 10),ShippedDate = new DateTime(2017, 6, 17),ShipmentCategory = "Edible"},
        new ShipmentData() { ID = 15,Name = " Sweet corn Frozen ",Category = "Edible",Units = 223,UnitPrice = 7,Price = 1561,ParentID = 1,OrderDate = new DateTime(2017, 7, 12),ShippedDate = new DateTime(2017, 7, 19),ShipmentCategory = "Edible"},
        new ShipmentData() { ID = 2,Name = "Order 2",Category = "Products",Units = 1944,UnitPrice = 58,Price = 21233,ParentID = null,OrderDate = new DateTime(2017, 1, 10),ShippedDate = new DateTime(2017, 1, 16),ShipmentCategory = "Seafood",Children = new List<ShipmentData>()},
        new ShipmentData() { ID = 21,Name = "Tilapias",Category = "Frozen Seafood",Units = 278,UnitPrice = 15,Price = 4170,ParentID = 2,OrderDate = new DateTime(2017, 2, 5),ShippedDate = new DateTime(2017, 2, 12),ShipmentCategory = "Frozen Seafood"},
        new ShipmentData() { ID = 22,Name = "White Shrimp",Category = "Frozen Seafood",Units = 560,UnitPrice = 7,Price = 3920,ParentID = 2,OrderDate = new DateTime(2017, 5, 22),ShippedDate = new DateTime(2017, 5, 29),ShipmentCategory = "Frozen Seafood"},
        new ShipmentData() { ID = 23,Name = "Fresh Cheese",Category = "Dairy",Units = 323,UnitPrice = 12,Price = 3876,ParentID = 2,OrderDate = new DateTime(2017, 6, 8),ShippedDate = new DateTime(2017, 6, 15),ShipmentCategory = "Dairy"},
        new ShipmentData() { ID = 24,Name = "Blue Veined Cheese",Category = "Dairy",Units = 370,UnitPrice = 15,Price = 5550,ParentID = 2,OrderDate = new DateTime(2017, 7, 10),ShippedDate = new DateTime(2017, 7, 17),ShipmentCategory = "Dairy"},
        new ShipmentData() { ID = 25,Name = "Butter",Category = "Dairy",Units = 413,UnitPrice = 9,Price = 3717,ParentID = 2,OrderDate = new DateTime(2017, 9, 18),ShippedDate = new DateTime(2017, 9, 25),ShipmentCategory = "Dairy"}
        };
        return DataCollection;
    }
}
}

Touch interaction

When the right edge of the header cell is tapped, a floating handler will be visible over the right border of the column. To resize the column, tap and drag the floating handler as needed.

The following screenshot represents the column resizing in touch device.

Column template

The column Template has options to display custom element instead of a field value in the column.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;
@inject Microsoft.AspNetCore.Components.NavigationManager UriHelper

<SfTreeGrid ModelType="@model" Height="400" DataSource="@TreeGridData" IdMapping="EmployeeID" ParentIdMapping="ParentId" TreeColumnIndex="0">
    <TreeGridColumns>
        <TreeGridColumn Field="Name" HeaderText="Name" Width="160"></TreeGridColumn>
        <TreeGridColumn HeaderText="Employee Image" Width="80">
            <Template>
                @{
                    var employee = (context as Employee);
                    <div class="image">
                        <img src="@UriHelper.ToAbsoluteUri($"images/TreeGrid/{employee.Name}.png")" alt="@employee.EmployeeID" />
                    </div>
                }
            </Template>
        </TreeGridColumn>
        <TreeGridColumn Field="DOB" HeaderText="DOB" Width="10" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Format="yMd"></TreeGridColumn>
        <TreeGridColumn Field="Designation" HeaderText="Designation" Width="120"></TreeGridColumn>
        <TreeGridColumn Field="EmployeeID" HeaderText="Employee ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Country" HeaderText="Country" Width="100"></TreeGridColumn>
        </TreeGridColumns>
</SfTreeGrid>

@code{
    public Employee model = new Employee();
    public IEnumerable<Employee> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = Employee.GetTemplateData();
    }
}

namespace TreeGridComponent.Data {

public class Employee
    {
        public string Name { get; set; }
        public string FullName { get; set; }
        public DateTime? DOB { get; set; }
        public string Designation { get; set; }
        public string EmpID { get; set; }
        public int? EmployeeID { get; set; }
        public string Country { get; set; }
        public string Address { get; set; }
        public string Contact { get; set; }
        public int? ParentId { get; set; }
        public TreeData Treedata { get; set; }

        public static List<Employee> GetTemplateData()
        {
            List<Employee> DataCollection = new List<Employee>();

            DataCollection.Add(new Employee { Name = "Robert King",FullName = "RobertKing",Designation = "Chief Executive Officer",EmployeeID = 1,EmpID = "EMP001",Address = "507 - 20th Ave. E.Apt. 2A, Seattle",Contact = "(206) 555-9857",Country = "USA",DOB = new DateTime(1963, 2, 15),ParentId = null,Treedata = new TreeData() { ID = 21}});
            DataCollection.Add(new Employee { Name = "David william",FullName = "DavidWilliam",Designation = "Vice President",EmployeeID = 2,EmpID = "EMP004",Address = "722 Moss Bay Blvd., Kirkland",Contact = "(206) 555-3412",Country = "USA",DOB = new DateTime(1971, 5, 20),ParentId = 1,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Nancy Davolio",FullName = "NancyDavolio",Designation = "Marketing Executive",EmployeeID = 3,EmpID = "EMP035",Address = "4110 Old Redmond Rd., Redmond",Contact = "(206) 555-8122",Country = "USA",DOB = new DateTime(1966, 3, 19),ParentId = 1,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Andrew Fuller",FullName = "AndrewFuller",Designation = "Sales Representative",EmployeeID = 4,EmpID = "EMP045",Country = "UK",DOB = new DateTime(1980, 9, 20),ParentId = 1,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Anne Dodsworth",FullName = "AnneDodsworth",Designation = "Sales Representative",EmployeeID = 5,EmpID = "EMP091",Country = "USA",ParentId = null,Treedata = new TreeData() { ID = 21 }});
            DataCollection.Add(new Employee { Name = "Michael Suyama",FullName = "MichaelSuyama",Designation = "Sales Representative",EmployeeID = 6,EmpID = "EMP110",Country = "UK",ParentId = 5,Treedata = new TreeData() { ID = 21 }});
            return DataCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Column Template

Tree Grid actions such as editing, filtering and sorting etc. will depend upon the column Field. If the Field is not specified in the template column, the tree grid actions cannot be performed.

For Templated Tree Grid component, ModelType property of Tree Grid should be defined.

Using condition template

You can render the template elements based on condition.

In the following code, checkbox is rendered based on Duration field value.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;
@using Syncfusion.Blazor.Buttons;

<SfTreeGrid DataSource="@TreeGridData" ModelType="@model" Id="TreeGrid" AllowPaging="true" ParentIdMapping="ParentID" IdMapping="TaskID" TreeColumnIndex="2">
        <TreeGridColumns>
            <TreeGridColumn HeaderText="Template Column" Width="90">
                <Template>
                    @{
                        @if (@context.Duration > 1)
                        {
                            <SfCheckBox Checked="true"></SfCheckBox>
                        }
                        else
                        {
                            <SfCheckBox Checked="false"></SfCheckBox>
                        }
                    }
                </Template>
            </TreeGridColumn>
            <TreeGridColumn Field="TaskID" HeaderText="Task ID" IsPrimaryKey="true" Width="60"></TreeGridColumn>
            <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="120"></TreeGridColumn>
            <TreeGridColumn Field="StartDate" HeaderText=" Start Date" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Format="yMd" Width="90" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
            <TreeGridColumn Field="Duration" HeaderText="Duration" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
            <TreeGridColumn Field="Progress" HeaderText="Progress" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
        </TreeGridColumns>
</SfTreeGrid>


@code{
    public SelfReferenceData model = new SelfReferenceData();
    public List<SelfReferenceData> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = SelfReferenceData.GetTree().ToList();
    }
}

namespace TreeGridComponent.Data {

public class SelfReferenceData
{
    public static List<SelfReferenceData> tree = new List<SelfReferenceData>();
    [Key]
    public int TaskID { get; set; }
    public string TaskName { get; set; }
    public DateTime StartDate { get; set; }
    public String Progress { get; set; }
    public int Duration { get; set; }
    public int? ParentID { get; set; }
    public SelfReferenceData() { }

    public static List<SelfReferenceData> GetTree()
    {
        if (tree.Count == 0)
        {
            int root = -1;
            for (var t = 1; t <= 60; t++)
            {
                Random ran = new Random();
                string math = (ran.Next() % 3) == 0 ? "High" : (ran.Next() % 2) == 0 ? "Release Breaker" : "Critical";
                string progr = (ran.Next() % 3) == 0 ? "Started" : (ran.Next() % 2) == 0 ? "Open" : "In Progress";
                root++;
                int rootItem = tree.Count + root + 1;
                tree.Add(new SelfReferenceData() { TaskID = rootItem, TaskName = "Parent Task " + rootItem.ToString(), StartDate = new DateTime(1992, 06, 07), ParentID = null, Progress = progr, Priority = math, Duration = ran.Next(1, 50) });
                int parent = tree.Count;
                for (var c = 0; c < 10; c++)
                {
                    root++;
                    string val = ((parent + c + 1) % 3 == 0) ? "Low" : "Critical";
                    int parn = parent + c + 1;
                    progr = (ran.Next() % 3) == 0 ? "In Progress" : (ran.Next() % 2) == 0 ? "Open" : "Validated";
                    int iD = tree.Count + root + 1;
                    tree.Add(new SelfReferenceData() { TaskID = iD, TaskName = "Child Task " + iD.ToString(), StartDate = new DateTime(1992, 06, 07), ParentID = rootItem, Progress = progr, Priority = val, Duration = ran.Next(1, 50) });
                    if ((((parent + c + 1) % 3) == 0))
                    {
                        int immParent = tree.Count;
                        for (var s = 0; s < 3; s++)
                        {
                            root++;
                            string Prior = (immParent % 2 == 0) ? "Validated" : "Normal";
                            tree.Add(new SelfReferenceData() { TaskID = tree.Count + root + 1, TaskName = "Sub Task " + (tree.Count + root + 1).ToString(), StartDate = new DateTime(1992, 06, 07), ParentID = iD, Progress = (immParent % 2 == 0) ? "On Progress" : "Closed", Priority = Prior, Duration = ran.Next(1, 50) });
                        }
                    }
                }
            }
        }
        return tree;
    }
}
}

For Templated Tree Grid component, ModelType property of Tree Grid should be defined.

Column type

Column type can be specified using the Type property of TreeGridColumn tag helper. It specifies the type of data the column binds.

If the Format is defined for a column, the column uses Type to select the appropriate format option (number or date).

Tree Grid column supports the following types:

string
number
boolean
date
datetime

If the Type is not defined, it will be determined from the first record of the DataSource.

The column menu has options to integrate features like sorting, filtering, and autofit. It will show a menu with the integrated feature when users click on multiple icon of the column. To enable column menu, you need to define the ShowColumnMenu property as true.

The default items are displayed in following table.

Item	Description
SortAscending	Sort the current column in ascending order.
SortDescending	Sort the current column in descending order.
AutoFit	Auto fit the current column.
AutoFitAll	Auto fit all columns.
Filter	Show the filter option as given in FilterSettings.Type

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" ShowColumnMenu="true" AllowFiltering="true"
             AllowSorting="true" AllowResizing="true">
    <TreeGridFilterSettings Type="Syncfusion.Blazor.TreeGrid.FilterType.Menu"/>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" MinWidth="170" MaxWidth="250" Width="180"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" MinWidth="50" MaxWidth="150" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",Duration = 10,Progress = 70,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",Progress = 80,ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",Duration = 5,Progress = 65,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",Duration = 6,Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",Duration = 10,Progress = 70,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",Duration = 4,Progress = 80,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",Duration = 5,Progress = 65,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",Duration = 6,Progress = 77,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",Duration = 6,Progress = 77,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Column Menu

You can disable column menu for a particular column by defining the ShowColumnMenu property of TreeGridColumn tag helper as false.

Checkbox column

To render checkboxes in existing column, you need to set ShowCheckbox property of TreeGridColumn as true.

It is also possible to select the rows hierarchically using checkboxes in Tree Grid by enabling AutoCheckHierarchy property. When we check on any parent record checkbox then the child record checkboxes will get checked.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AutoCheckHierarchy="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" ShowCheckbox="true" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Progress = 80,ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,Progress = 70,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,Progress = 80,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,Progress = 65,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,Progress = 77,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Checkbox Column

Responsive columns

You can toggle column visibility based on media queries which are defined at the HideAtMedia. The HideAtMedia accepts valid Media Queries.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AutoCheckHierarchy="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" HideAtMedia="max-width: 700px" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" ShowCheckbox="true" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" HideAtMedia="max-width: 500px" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Responsive Columns

Controlling Tree Grid actions

You can enable or disable tree grid action for a particular column by setting the AllowFiltering, and AllowSorting properties of TreeGridColumn tag helper.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowFiltering="true" AllowSorting="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" AllowSorting="false" AllowFiltering="false" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration"  TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

Show/hide columns by external button

You can show or hide tree grid columns dynamically using external buttons by invoking the ShowColumns or HideColumns method.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<button id="hide" @onclick="HideColumns">Hide Column</button>
<button id="show" @onclick="ShowColumns">Show Column</button>

<SfTreeGrid @ref="TreeGrid" IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowFiltering="true" AllowSorting="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" AllowSorting="false" AllowFiltering="false" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="StartDate" HeaderText=" Start Date" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Format="yMd" Type="Syncfusion.Blazor.Grids.ColumnType.Date" Width="90">
        </TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    SfTreeGrid<TreeData.BusinessObject> TreeGrid;
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
    private void HideColumns()
    {
        this.TreeGrid.HideColumns(new List<string>() { "Task ID", "Duration" }); //hide by HeaderText
    }
    private void ShowColumns()
    {
        this.TreeGrid.ShowColumns(new List<string>() { "Task ID", "Duration" }); //show by HeaderText
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public DateTime? StartDate { get; set;}
            public int? Duration { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",StartDate = new DateTime(2017, 10, 23),Duration = 10,ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",StartDate = new DateTime(2017, 10, 23),Duration = 4,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",StartDate = new DateTime(2017, 10, 24),Duration = 5,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",StartDate = new DateTime(2017, 10, 25),Duration = 6,ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

Complex data binding

You can achieve complex data binding in the tree grid by using the dot(.) operator in the Field.

index.razor

treegriddata.cs

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1" AllowFiltering="true" AllowSorting="true">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" AllowSorting="false" AllowFiltering="false" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Assignee.FirstName" HeaderText="First Name" Width="90"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    SfTreeGrid TreeGrid;
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public Employee Assignee { get; set; }
            public int? Duration { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",Duration = 10,ParentId = null,Assignee = new Employee() { FullName = "Nancy", EmpID ="EMP001", Country = "USA" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",Duration = 7,ParentId = 1,Assignee = new Employee() { FullName = "Andrew", EmpID ="EMP004", Country = "USA" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",Duration = 5,ParentId = 2,Assignee = new Employee() { FullName = "Janet", EmpID ="EMP035", Country = "USA" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",Duration = 6,ParentId = 3,Assignee = new Employee() { FullName = "Margaret", EmpID ="EMP045", Country = "UK" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",Duration = 10,ParentId = null,Assignee = new Employee() { FullName = "steven", EmpID ="EMP091", Country = "USA" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",Duration = 4,ParentId = 5,Assignee = new Employee() { FullName = "Micheal", EmpID ="EMP092", Country = "USA" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",Duration = 5,ParentId = 5,Assignee = new Employee() { FullName = "Robert", EmpID ="EMP093", Country = "UK" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",Duration = 6,ParentId = 5,Assignee = new Employee() { FullName = "Laura", EmpID ="EMP094", Country = "USA" } });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",Duration = 6,ParentId = 5,Assignee = new Employee() { FullName = "Anne", EmpID ="EMP095", Country = "UK" } });
            return BusinessObjectCollection;
        }
    }

    public class Employee
    {
        public string Country { get; set; }
        public string FullName { get; set; }
        public string EmpID { get; set; }
        public int? ParentId { get; set; }
    }
}

The following output is displayed as a result of the above code example.

Complex Data Binding

How to render boolean values as checkbox

To render boolean values as checkbox in columns, you need to set DisplayAsCheckBox property as true.

index.razor

treegriddata.cs

@using TreeGridComponent.Data
@using Syncfusion.Blazor.TreeGrid;

<SfTreeGrid IdMapping="TaskId" ParentIdMapping="ParentId" DataSource="@TreeGridData" TreeColumnIndex="1">
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="160"></TreeGridColumn>
        <TreeGridColumn Field="Duration" HeaderText="Duration" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Approved" HeaderText="Approved" DisplayAsCheckBox="true" Width="80"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

namespace TreeGridComponent.Data {

public class TreeData
    {
        public class BusinessObject
        {
            public int TaskId { get; set;}
            public string TaskName { get; set;}
            public int? Duration { get; set;}
            public int? Progress { get; set;}
            public bool Approved { get; set;}
            public int? ParentId { get; set;}
        }

        public static List<BusinessObject> GetSelfDataSource()
        {
            List<BusinessObject> BusinessObjectCollection = new List<BusinessObject>();
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 1,TaskName = "Parent Task 1",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 2,TaskName = "Child task 1",Progress = 80,Priority = "Low",ParentId = 1 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 3,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Critical",ParentId = 2 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 4,TaskName = "Child task 3",Duration = 6,Priority = "High",Progress = 77,ParentId = 3 });
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 5,TaskName = "Parent Task 2",Duration = 10,Progress = 70,Priority = "Critical",ParentId = null});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 6,TaskName = "Child task 1",Duration = 4,Progress = 80,Priority = "Critical",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 7,TaskName = "Child Task 2",Duration = 5,Progress = 65,Priority = "Low",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 8,TaskName = "Child task 3",Duration = 6,Progress = 77,Priority = "High",ParentId = 5});
            BusinessObjectCollection.Add(new BusinessObject() { TaskId = 9,TaskName = "Child task 4",Duration = 6,Progress = 77,Priority = "Low",ParentId = 5});
            return BusinessObjectCollection;
        }
    }
}

The following output is displayed as a result of the above code example.

Checkbox

Please provide additional information

Thank you for your feedback and comments.We will rectify this as soon as possible!

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