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V25.1
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    TreeListCustomizeSummaryDisplayTextEventArgs Class

    Contains data for the CustomizeSummaryDisplayText event.

    Namespace: DevExpress.Blazor

    Assembly: DevExpress.Blazor.v25.1.dll

    NuGet Package: DevExpress.Blazor

    #Declaration

    C#
    public class TreeListCustomizeSummaryDisplayTextEventArgs :
        GridCustomizeSummaryDisplayTextEventArgsBase

    #Remarks

    Use TreeListCustomizeSummaryDisplayTextEventArgs (Value, DisplayText, and so on) to specify the summary display text and access other TreeList data.

    The following code sample calculates the sum of March Sales values of selected TreeList rows:

    Run Demo: Custom Summary

    Razor
    @inject ISalesByRegionDataProvider SalesByRegionDataProvider
    <DxTreeList @ref="TreeList"
                Data="Data"
                KeyFieldName="ID"
                ParentKeyFieldName="RegionID"
                ShowAllRows="true"
                CustomSummary="TreeList_CustomSummary"
                CustomizeSummaryDisplayText="TreeList_CustomizeSummaryDisplayText"
                SelectedDataItemsChanged="TreeList_SelectedDataItemsChanged">
        <Columns>
            <DxTreeListSelectionColumn Width="50px" />
            <DxTreeListDataColumn FieldName="Region" Width="15%" />
            <DxTreeListDataColumn FieldName="MarchSales" DisplayFormat="c0" Width="25%" />
            <DxTreeListDataColumn FieldName="SeptemberSales" DisplayFormat="c0" Width="15%" />
            <DxTreeListDataColumn FieldName="MarchChange" DisplayFormat="p2" Width="15%" />
            <DxTreeListDataColumn FieldName="SeptemberChange" DisplayFormat="p2" Width="15%" />
            <DxTreeListDataColumn FieldName="MarketShare" DisplayFormat="p0" Width="15%" />
        </Columns>
        <TotalSummary>
            <DxTreeListSummaryItem SummaryType="TreeListSummaryItemType.Count" FieldName="Region" />
            <DxTreeListSummaryItem SummaryType="TreeListSummaryItemType.Sum" FieldName="MarchSales" />
            <DxTreeListSummaryItem SummaryType="TreeListSummaryItemType.Custom" FieldName="MarchSales" Name="Custom" />
        </TotalSummary>
    </DxTreeList>
    
    @code {
        ITreeList TreeList { get; set; }
        object Data { get; set; }
        protected override void OnInitialized() {
            Data = SalesByRegionDataProvider.GenerateData();
        }
        void TreeList_CustomSummary(TreeListCustomSummaryEventArgs e) {
            switch(e.SummaryStage) {
                case TreeListCustomSummaryStage.Start:
                    e.TotalValue = 0m;
                    break;
                case TreeListCustomSummaryStage.Calculate:
                    if(e.TreeList.IsDataItemSelected(e.DataItem))
                        e.TotalValue = (decimal)e.TotalValue + (decimal)e.GetRowValue("MarchSales");
                    break;
            }
        }
        void TreeList_CustomizeSummaryDisplayText(TreeListCustomizeSummaryDisplayTextEventArgs e) {
            if(e.Item.Name == "Custom")
                e.DisplayText = string.Format("Sum of Selected ({0}): {1:c0}", e.TreeList.SelectedDataItems.Count, e.Value);
        }
        void TreeList_SelectedDataItemsChanged(IReadOnlyList<object> newSelection) {
            TreeList.RefreshSummary();
        }
    }
    

    Blazor TreeList - Summary for Selection

    #Inheritance

    Object
    DevExpress.Blazor.Internal.GridEventArgsBase
    DevExpress.Blazor.Internal.GridCustomizeSummaryDisplayTextEventArgsBase
    TreeListCustomizeSummaryDisplayTextEventArgs
    See Also