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V25.1
  • DxTreeList.GetDataColumns() Method

    Returns a data column collection.

    Namespace: DevExpress.Blazor

    Assembly: DevExpress.Blazor.v25.1.dll

    NuGet Package: DevExpress.Blazor

    Declaration

    public IReadOnlyList<ITreeListDataColumn> GetDataColumns()

    Returns

    Type Description
    IReadOnlyList<ITreeListDataColumn>

    The data column collection.

    Remarks

    Call the GetDataColumns method to get a collection of data columns declared in the TreeList’s markup. To obtain a collection of all TreeList columns, call the GetColumns() method.

    @inject EmployeeTaskService EmployeeTaskService
    
    <style>
        .my-button{
            width: 150px;
            margin-bottom: 5px;
            margin-top: 5px;
        }
    </style>
    
    <DxTreeList @ref="@TreeList"
                Data="TreeListData"
                KeyFieldName="Id"
                ParentKeyFieldName="ParentId"
                @bind-SelectedDataItems="@SelectedDataItems">
        <Columns>       
            <DxTreeListDataColumn FieldName="EmployeeName" VisibleIndex="2" />
            <DxTreeListDataColumn FieldName="Name" VisibleIndex="1" />
            <DxTreeListDataColumn FieldName="StartDate" />
            <DxTreeListDataColumn FieldName="DueDate" />
            <DxTreeListSelectionColumn VisibleIndex="0" Width="50"/>
        </Columns>
    </DxTreeList>
    
    <DxButton Click="@OnGetDataColumns" Text="Get Data Columns" CssClass="my-button" />
    <div><b>Data Columns</b>: @ColumnInfo</div>
    
    @code {
        List<EmployeeTask> TreeListData { get; set; }
        ITreeList TreeList { get; set; }
        string ColumnInfo { get; set; }
        IReadOnlyList<object> SelectedDataItems { get; set; }
    
        protected override void OnInitialized() {
            TreeListData = EmployeeTaskService.GenerateData();
        }
        void OnGetDataColumns() {
            var columns = TreeList.GetDataColumns().Select(
                (column) => (column as ITreeListDataColumn).FieldName
            );
            ColumnInfo = string.Join("; ", columns);
        }
    }
    

    Blazor TreeList Get Data Columns

    Implements

    See Also