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IGridSelectionChanges Interface

Allows you to track selection changes in the Grid.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v22.2.dll

NuGet Package: DevExpress.Blazor

Declaration

public interface IGridSelectionChanges

Remarks

The Grid supports multiple row selection. The SelectedDataItems property specifies data items that correspond to the selected rows.

You can handle the SelectedDataItemsChanged event to respond to selection changes. The IGridSelectionChanges interface allows you to get data items that were added and removed from selection. To do this, cast the event handler’s parameter to this interface and use the SelectedDataItems and DeselectedDataItems properties.

The following example handles the SelectedDataItemsChanged event to display information about selection changes:

@using Microsoft.EntityFrameworkCore
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
@implements IDisposable

<DxGrid Data="GridDataSource"
        AllowSelectRowByClick="true"
        SelectedDataItems="@SelectedDataItems"
        SelectedDataItemsChanged="OnSelectedDataItemsChanged"
        KeyFieldName="ProductId">
    <Columns>
        <DxGridDataColumn FieldName="ProductName" />
        <DxGridDataColumn FieldName="UnitPrice" />
        <DxGridDataColumn FieldName="QuantityPerUnit" />
        <DxGridDataColumn FieldName="UnitsInStock" />
    </Columns>
</DxGrid>

<br />
<div><b>Added to selection</b>: @SelectedItemsInfo</div>
<div><b>Removed from selection</b>: @DeselectedItemsInfo</div>

@code {
    IEnumerable<object> GridDataSource { get; set; }
    NorthwindContext Northwind { get; set; }
    IReadOnlyList<object> SelectedDataItems { get; set; }
    string SelectedItemsInfo { get; set; }
    string DeselectedItemsInfo { get; set; }

    protected override void OnInitialized() {
        Northwind = NorthwindContextFactory.CreateDbContext();
        GridDataSource = Northwind.Products
            .ToList();
        SelectedDataItems = GridDataSource.Skip(1).Take(2).ToList();
    }

    void OnSelectedDataItemsChanged(IReadOnlyList<object> newSelection) {
        if (newSelection is IGridSelectionChanges changes) {
            SelectedItemsInfo = string.Join(";  ", changes.SelectedDataItems
                .Cast<Product>()
                .Select(p => p.ProductName)
            );
            DeselectedItemsInfo = string.Join(";  ", changes.DeselectedDataItems
                .Cast<Product>()
                .Select(p => p.ProductName)
            );
        }
        SelectedDataItems = newSelection;
    }

    public void Dispose() {
        Northwind?.Dispose();
    }
}

Blazor Grid Selected Data Item Changed

See Also