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DxTreeList.GetDataColumns() Method

Returns a data column collection.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.2.dll

NuGet Package: DevExpress.Blazor

#Declaration

C#
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