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V25.1
  • DxTreeList.DeselectDataItems(IEnumerable<Object>) Method

    Deselects rows that correspond to the specified data items.

    Namespace: DevExpress.Blazor

    Assembly: DevExpress.Blazor.v25.1.dll

    NuGet Package: DevExpress.Blazor

    Declaration

    public void DeselectDataItems(
        IEnumerable<object> dataItems
    )

    Parameters

    Name Type Description
    dataItems IEnumerable<Object>

    A data item collection.

    Remarks

    The following methods allow you to manage TreeList selection:

    Call the DeselectDataItems method to deselect rows that correspond to the specified data items. To select rows, pass data items to the SelectDataItems method. To access selected data items, implement two-way binding for the SelectedDataItems property or handle the SelectedDataItemsChanged event.

    The following example selects and deselects rows that correspond to the second and third data items:

    @inject EmployeeTaskService EmployeeTaskService
    
    <DxTreeList @ref="MyTreeList"
                Data="TreeListData"
                KeyFieldName="Id"
                ParentKeyFieldName="ParentId"
                AllowSelectRowByClick="true"
                @bind-SelectedDataItems="@SelectedDataItems">
        <Columns>
            <DxTreeListDataColumn FieldName="Name" Caption="Task" />
            <DxTreeListDataColumn FieldName="EmployeeName" />
            <DxTreeListDataColumn FieldName="StartDate" />
            <DxTreeListDataColumn FieldName="DueDate" />
        </Columns>
        <ToolbarTemplate>
            <DxToolbar>
                <Items>
                    <DxToolbarItem Click="() => MyTreeList.SelectDataItems(dataItems)" Text="Select Data Items" />
                    <DxToolbarItem Click="() => MyTreeList.DeselectDataItems(dataItems)" Text="Deselect Data Items" />
                </Items>
            </DxToolbar>
        </ToolbarTemplate>
    </DxTreeList>
    
    @code {
        ITreeList MyTreeList { get; set; }
        List<EmployeeTask> TreeListData { get; set; }
        IReadOnlyList<object> SelectedDataItems { get; set; }
        IEnumerable<object> dataItems { get; set; }
    
        protected override void OnInitialized() {
            TreeListData = EmployeeTaskService.GenerateData();
            dataItems = TreeListData.Skip(1).Take(2).ToList();
        }
    }
    

    Blazor TreeList Select and Deselect Data Items

    For more information about selection in the TreeList component, refer to the following topic: Selection and Focus in Blazor TreeList.

    See Also