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Select datagrid rows based on certain condition in Blazor DataGrid component

You can select specific rows in the datagrid based on some conditions by using the SelectRows method in the DataBound event of the DataGrid component.

This is demonstrated in the below sample code where the index value of datagrid rows with Freight column value greater than 10 are stored in the RowDataBound event and then selected in the DataBound event,

@using Syncfusion.Blazor.Grids

<SfGrid @ref="DefaultGrid" DataSource="@Orders" AllowPaging="true">
    <GridSelectionSettings Type="SelectionType.Multiple"></GridSelectionSettings>
    <GridEvents RowDataBound="OnRowDataBound" DataBound="OnDataBound" TValue="Order"></GridEvents>
    <GridPageSettings PageSize="8"></GridPageSettings>
    <GridColumns>
        <GridColumn Field=@nameof(Order.OrderID) HeaderText="Order ID" TextAlign="TextAlign.Right" Width="120"></GridColumn>
        <GridColumn Field=@nameof(Order.CustomerID) HeaderText="Customer Name" TextAlign="TextAlign.Right" Width="120"></GridColumn>
        <GridColumn Field=@nameof(Order.OrderDate) HeaderText=" Order Date" Format="d" Type=ColumnType.Date TextAlign="TextAlign.Right" Width="120"></GridColumn>
        <GridColumn Field=@nameof(Order.Freight) HeaderText="Freight" Format="C2" TextAlign="TextAlign.Right" Width="120"></GridColumn>
    </GridColumns>
</SfGrid>

@code{
    private SfGrid<Order> DefaultGrid;

    public List<Order> Orders { get; set; }

    public List<int> SelectedNodeIndex = new List<int>();

    protected override void OnInitialized()
    {
        Orders = Enumerable.Range(1, 75).Select(x => new Order()
        {
            OrderID = 1000 + x,
            CustomerID = (new string[] { "ALFKI", "ANANTR", "ANTON", "BLONP", "BOLID" })[new Random().Next(5)],
            Freight = 2.5 * x,
            OrderDate = DateTime.Now.AddDays(-x),
        }).ToList();
    }
    public class Order
    {
        public int? OrderID { get; set; }
        public string CustomerID { get; set; }
        public DateTime? OrderDate { get; set; }
        public double? Freight { get; set; }
    }

    public void OnDataBound(object args)
    {
        // The filtered index values are selected
        this.DefaultGrid.SelectRows(SelectedNodeIndex);
    }

    public void OnRowDataBound(RowDataBoundEventArgs<Order> args)
    {
        // Freight values greater than 10 are filtered by comparing the primary column values
        if (args.Data.Freight > 10)
        {
            var dataSource = this.DefaultGrid.DataSource;
            var index = 0;
            foreach (var data in dataSource)
            {
                if (data.OrderID == args.Data.OrderID)
                {
                    SelectedNodeIndex.Add(index);
                    break;
                }
                index++;
            }
        }
    }
}