TreeListCustomizeSummaryDisplayTextEventArgs Class
Contains data for the CustomizeSummaryDisplayText event.
Namespace: DevExpress.Blazor
Assembly: DevExpress.Blazor.v24.2.dll
NuGet Package: DevExpress.Blazor
#Declaration
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:
@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();
}
}