Editing in Blazor Tree Grid Component

17 Dec 202224 minutes to read

The Tree Grid component has options to dynamically insert, delete and update records. Editing feature is enabled by using the TreeGridEditSettings property and it requires a primary key column for CRUD operations.

To know more about editing feature in Blazor tree grid component, you can check on this video.

To define the primary key, set the TreeGridColumn.IsPrimaryKey to true in particular column.

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" >
    <TreeGridEditSettings AllowEditing="true"/>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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();
    }
}

C#

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 editing can be disabled for a particular column, by specifying TreeGridColumn.AllowEditing to false.

NOTE

To perform the editing operation in the Blazor Tree Grid, it is recommended to mention the respective model class type (List), in the Tree Grid's dataSource property value.

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

Toolbar with edit option

The tree grid toolbar has the built-in items to execute Editing actions. It can be defined by using the Toolbar property.

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId"
TreeColumnIndex="1" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Update", "Cancel" })">
    <TreeGridEditSettings AllowEditing="true" AllowAdding="true" AllowDeleting="true"/>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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();
    }
}

C#

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;
        }
    }
}

Default column values on add new

The tree grid provides an option to set the default value for the columns when adding a new record in it. To set a default value for the particular column by defining the TreeGridColumn.DefaultValue.

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Update", "Cancel" })">
    <TreeGridEditSettings AllowEditing="true" AllowAdding="true" AllowDeleting="true" ShowDeleteConfirmDialog="true" />
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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" DefaultValue="@DefaultVal" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    public List<TreeData.BusinessObject> TreeGridData { get; set; }

    public int DefaultVal { get; set; } = 45;

    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

C#

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;
        }
    }
}

Disable editing for particular column

The editing can be disabled for particular columns by using the TreeGridColumn.AllowEditing.

In the following demo, editing is disabled for the Duration column.

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Update", "Cancel" })">
    <TreeGridEditSettings AllowEditing="true" AllowAdding="true" AllowDeleting="true" ShowDeleteConfirmDialog="true" />
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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" AllowEditing="false" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
        <TreeGridColumn Field="Progress" HeaderText="Progress" Width="100" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

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

C#

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;
        }
    }
}

Adding row position

The Tree Grid control provides the support to add the new row in the top, bottom, above selected row, below selected row and child position of tree grid content using the TreeGridEditSettings.NewRowPosition property. By default, a new row will be added at the top of the tree grid.

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Update", "Cancel" })">
    <TreeGridEditSettings AllowEditing="true" AllowAdding="true" AllowDeleting="true" NewRowPosition="RowPosition.Child" />
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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();
    }
}

C#

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 examples shows how to set new row position as Child in tree grid.

Confirmation messages

Delete confirmation

The delete confirm dialog can be shown when deleting a record by defining the ShowDeleteConfirmDialog as true

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Update", "Cancel" })">
    <TreeGridEditSettings AllowEditing="true" AllowAdding="true" AllowDeleting="true" ShowDeleteConfirmDialog="true"/>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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>
    </TreeGridColumns>
</SfTreeGrid>

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

C#

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;
        }
    }
}

NOTE

The ShowDeleteConfirmDialog supports all type of edit modes.

Troubleshoot: Editing works only for first row

The Editing functionalities can be performed based upon the primary key value of the selected row. If IsPrimaryKey is not defined in the tree grid, then edit or delete action take places the first row.

Event trace while editing

While the editing operation is getting executed, the following events are notified:

• OnActionBegin
• OnActionComplete

In both events, the editing operation type is returned in the RequestType parameter of the event arguments. In addition, the event arguments return the edited row data.

The RequestType values for the editing operations are listed in the below table.

RequestType	OnActionBegin	OnActionComplete
BeginEdit	Before editing operation begins	After editing operation is completed
Add	Before add operation begins	After add operation is completed
Delete	Before delete operation begins	After delete operation is completed
Save	Before save operation begins	After save operation is completed
Cancel	Before cancel operation begins	After cancel operation is completed

The following sample code demonstrates the different RequestType parameters of OnActionBegin and OnActionComplete events while performing editing operations.

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Cancel", "Update" })" ParentIdMapping="ParentId" TreeColumnIndex="1" >
    <TreeGridEditSettings AllowAdding="true" AllowEditing="true" AllowDeleting="true"></TreeGridEditSettings>
    <TreeGridEvents OnActionBegin="ActionBegin" OnActionComplete="ActionComplete" TValue="TreeData.BusinessObject"></TreeGridEvents>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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();
    }
    public void ActionBegin(ActionEventArgs<TreeData.BusinessObject> args)
    {
        if (args.RequestType == Syncfusion.Blazor.Grids.Action.BeginEdit)
        {
            // Triggers before editing operation starts
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Add)
        {
            // Triggers before add operation starts
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Cancel)
        {
            // Triggers before cancel operation starts
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Save)
        {
            // Triggers before save operation starts
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Delete)
        {
            // Triggers before delete operation starts
        }
    }

    public void ActionComplete(ActionEventArgs<TreeData.BusinessObject> args)
    {
        if (args.RequestType == Syncfusion.Blazor.Grids.Action.BeginEdit)
        {
            // Triggers once editing operation completes
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Add)
        {
            // Triggers once add operation completes
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Cancel)
        {
            // Triggers once cancel operation completes
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Save)
        {
            // Triggers once save operation completes
        }
        else if (args.RequestType == Syncfusion.Blazor.Grids.Action.Delete)
        {
            // Triggers once delete operation completes
        }
    }
}

C#

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",Duration = 8,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;
        }
    }
}

Performing CRUD operations programmatically

Perform the CRUD operations like Add, Update, Delete by using the AddRecord, UpdateRow, DeleteRow methods.

• AddRecord - Add a new record into the tree grid.
• UpdateRow - Update an existing record in a tree grid.
• DeleteRow - Delete a selected row from the tree grid.

RAZOR

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

<SfButton @onclick="Add"> Add </SfButton>
<SfButton @onclick="Update"> Update Parent Task 1 </SfButton>
<SfButton @onclick="Delete"> Delete the selected row </SfButton>

<SfTreeGrid @ref="treegrid" DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" >
    <TreeGridEditSettings AllowAdding="true" AllowEditing="true" AllowDeleting="true"/>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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();
    }
    public async Task Add()
    {
        TreeData.BusinessObject adddata = new TreeData.BusinessObject()
        {
            TaskId = 100,
            TaskName = "New Record",
            Duration = 5,
            Progress = 65,
            Priority = "Low",
            ParentId = null
        };
        await this.treegrid.AddRecord(adddata);
    }

    public async Task Update()
    {
        TreeData.BusinessObject data = new TreeData.BusinessObject() {  TaskId = 1,TaskName = "Updated Task",Duration = 45,Progress = 50,Priority = "Low",ParentId = null };
        await this.treegrid.UpdateRow(1, data);
    }

    public async Task Delete()
    {
        await this.treegrid.DeleteRecord();
    }
}

C#

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",Duration = 8,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 GIF represents the tree grid with Add, Update, and Delete items.

Cancel CRUD operation by using condition

Cancel the default CRUD operation by specifying the Cancel property as true based on the corresponding RequestType property values of the event argument.

Cancel CRUD operation for Row/Dialog edit mode

For Row or Dialog edit mode, you have to specify the Cancel property as true based on the corresponding RequestType property values in the OnActionBegin event.

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Cancel", "Update" })" ParentIdMapping="ParentId" TreeColumnIndex="1" >
    <TreeGridEditSettings AllowAdding="true" AllowEditing="true" AllowDeleting="true" Mode="Syncfusion.Blazor.TreeGrid.EditMode.Row"></TreeGridEditSettings>
    <TreeGridEvents OnActionBegin="ActionBeginHandler" TValue="TreeData.BusinessObject"></TreeGridEvents>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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();
    }
    public void ActionBeginHandler(ActionEventArgs<TreeData.BusinessObject> args)
    {
        if (args.RequestType.Equals(Syncfusion.Blazor.Grids.Action.BeginEdit) && args.Data.TaskId > 5)
        {
            args.Cancel = true;
        }
        if (args.RequestType.Equals(Syncfusion.Blazor.Grids.Action.Save) && args.Action == "Edit" && args.Data.TaskId > 6)
        {
            args.Cancel = true;
        }
        if (args.RequestType.Equals(Syncfusion.Blazor.Grids.Action.Save) && args.Action == "Add" && args.Data.TaskId > 7)
        {
            args.Cancel = true;
        }
        if (args.RequestType.Equals(Syncfusion.Blazor.Grids.Action.Delete))
        {
            args.Cancel = true;
        }
    }
}

C#

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",Duration = 8,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;
        }
    }
}

Custom external edit form

Perform the edit operation of tree grid in a custom external form. The edit operation can be done by the RowSelected event and UpdateRow method of tree grid.

RAZOR

@using TreeGridComponent.Data;
@using Syncfusion.Blazor.TreeGrid;
@using Syncfusion.Blazor.Grids;
@using Syncfusion.Blazor.Buttons
@using Syncfusion.Blazor.DropDowns
@using Syncfusion.Blazor.Inputs

<div class="row">
    <div class="col-md-6">
        <div>
            <div class="form-row">
                <div class="form-group col-md-12">
                    <label for="TaskIdedit">TaskId</label>
                    <input class="form-control" @bind="@(data.TaskId)" type="number" disabled />
                </div>
            </div>
            <div class="form-row">
                <div class="form-group col-md-12">
                    <label for="Tasknameedit">TaskName</label>
                    <SfTextBox ID="TaskName" @bind-Value="@(data.TaskName)"></SfTextBox>
                </div>
            </div>
            <div class="form-row">
                <div class="form-group col-md-12">
                    <label for="Progressedit">Progress</label>
                    <SfNumericTextBox ID="Progress" TValue="int" @bind-Value="@data.Progress"></SfNumericTextBox>
                </div>
            </div>
            <div class="form-row">
                <div class="form-group col-md-12">
                    <label for="Priorityedit">Priority</label>
                    <SfDropDownList ID="Priority" @bind-Value="@data.Priority" TItem="Prior" TValue="string" DataSource="@Prioritize">
                        <DropDownListFieldSettings Value="Priority" Text="Priority"></DropDownListFieldSettings>
                    </SfDropDownList>
                </div>
            </div>
        </div>
        <SfButton @onclick="Save">Save</SfButton>
    </div>
    <div class="col-md-6">
        <SfTreeGrid @ref="treegrid" DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Update", "Cancel" })">
            <TreeGridEditSettings AllowEditing="true" AllowAdding="true" AllowDeleting="true" Mode="Syncfusion.Blazor.TreeGrid.EditMode.Row" />
            <TreeGridEvents RowSelected="RowSelectHandler" TValue="TreeData.BusinessObject"></TreeGridEvents>
            <TreeGridColumns>
                <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" Width="80" TextAlign="Syncfusion.Blazor.Grids.TextAlign.Right"></TreeGridColumn>
                <TreeGridColumn Field="TaskName" HeaderText="Task Name" Width="160"></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>
    </div>
</div>

@code{
    SfTreeGrid<TreeData.BusinessObject> treegrid;
    public TreeData.BusinessObject data = new TreeData.BusinessObject();
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    public List<Prior> Prioritize { get; set; } = new List<Prior>()
    {
        new Prior(){ Priority="Critical"},
        new Prior(){ Priority="High"},
        new Prior(){ Priority="Low"}
    };
    public class Prior
    {
        public string Priority { get; set; }
    }
    async Task Save()
    {
        await this.treegrid.UpdateRow(1, data);
    }
    public void RowSelectHandler(RowSelectEventArgs<TreeData.BusinessObject> args)
    {
        data = args.Data;
    }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
    }
}

C#

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",Duration = 8,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 GIF represent the tree grid with the Custom External form editing,

Edit enum column

Edit the enum type data in the tree grid column using the EditTemplate feature of the tree grid.

In the following sample, the SfDropDownList component is rendered in the EditTemplate for the Priority column and the enumerated list data can be bound as two-way binding (@bind-Value).

RAZOR

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

<SfTreeGrid DataSource="@TreeGridData" IdMapping="TaskId" ParentIdMapping="ParentId" TreeColumnIndex="1" Toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Cancel", "Update" })" >
    <TreeGridEditSettings AllowAdding="true" AllowEditing="true" AllowDeleting="true" Mode="Syncfusion.Blazor.TreeGrid.EditMode.Row"/>
    <TreeGridColumns>
        <TreeGridColumn Field="TaskId" HeaderText="Task ID" IsPrimaryKey="true" 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">
            <EditTemplate>
                @{
                    var Order = (context as TreeData.BusinessObject);
                    <SfDropDownList @ref="DropDownList" ID="Edge" DataSource="@DropDownEnumValue" @bind-Value="@((context as TreeData.BusinessObject).Priority)" TValue="Prioritize" TItem="string" Placeholder="Priority Detail" FloatLabelType="FloatLabelType.Always">
                    </SfDropDownList>
                }
            </EditTemplate>
        </TreeGridColumn>
    </TreeGridColumns>
</SfTreeGrid>

@code{
    SfDropDownList<Prioritize, string> DropDownList;
    public List<string> DropDownEnumValue = new List<string>();
    public enum Prioritize
    {
        High = 0,
        Low = 1,
        Critical = 2
    }
    public List<TreeData.BusinessObject> TreeGridData { get; set; }
    protected override void OnInitialized()
    {
        this.TreeGridData = TreeData.GetSelfDataSource().ToList();
        foreach (string item in Enum.GetNames(typeof(Prioritize)))
        {
            DropDownEnumValue.Add(item);
        }
    }
}

C#

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

See also

• Cascading DropDownList while Editing in Blazor TreeGrid