DxGrid.RefreshSummary() Method

Refreshes all total and group summary values in the grid.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

public void RefreshSummary()

Remarks

Call the RefreshSummary method to update custom summary values that change dynamically.

In the example below, the grid’s custom summary displays the sum of Total values for selected grid rows. The RefreshSummary method updates the custom summary value when a user selects new rows.

Run Demo: Grid - Custom Summary

<DxGrid @ref="Grid"
        Data="@Data"
        SelectedDataItems="@SelectedDataItems"
        SelectedDataItemsChanged="Grid_SelectedDataItemsChanged"
        CustomSummary="Grid_CustomSummary"
        CustomizeSummaryDisplayText="Grid_CustomizeSummaryDisplayText">
    <Columns>
        <DxGridSelectionColumn />
        <DxGridDataColumn FieldName="OrderId" Caption="Order ID"/>
        <DxGridDataColumn FieldName="CustomerId" Caption="Customer">
            <EditSettings>
                <DxComboBoxSettings Data="Customers" ValueFieldName="CustomerId" TextFieldName="ContactName"/>
            </EditSettings>
        </DxGridDataColumn>
        <DxGridDataColumn FieldName="OrderDate" />
        <DxGridDataColumn FieldName="ShipCountry" />
        <DxGridDataColumn FieldName="ShipCity" />
        <DxGridDataColumn FieldName="ShippedDate" />
        <DxGridDataColumn FieldName="Total" DisplayFormat="c" />
    </Columns>
    <TotalSummary>
        <DxGridSummaryItem SummaryType="GridSummaryItemType.Custom" Name="Custom" FieldName="Total" />
        <DxGridSummaryItem SummaryType="GridSummaryItemType.Sum"
                           FieldName="Total"
                           DisplayText="Grand Total: {0}"
                           ValueDisplayFormat="c0" />
    </TotalSummary>
</DxGrid>

@code {
    IEnumerable<object> Data { get; set; }
    IReadOnlyList<Customer> Customers { get; set; }
    IReadOnlyList<object> SelectedDataItems { get; set; }
    IGrid Grid { get; set; }
    @* ... *@
    void Grid_CustomSummary(GridCustomSummaryEventArgs e) {
        switch(e.SummaryStage) {
            case GridCustomSummaryStage.Start:
                e.TotalValue = 0m;
                break;
            case GridCustomSummaryStage.Calculate:
                if(e.Grid.IsDataItemSelected(e.DataItem))
                    e.TotalValue = (decimal)e.TotalValue + (decimal)e.GetRowValue("Total");
                break;
        }
    }
    void Grid_CustomizeSummaryDisplayText(GridCustomizeSummaryDisplayTextEventArgs e) {
        if(e.Item.Name == "Custom")
            e.DisplayText = string.Format("Sum of Selected ({0}): {1:c0}", SelectedDataItems.Count, e.Value);
    }
    void Grid_SelectedDataItemsChanged(IReadOnlyList<object> newSelection) {
        SelectedDataItems = newSelection;
        Grid.RefreshSummary();
    }
}

For more information about summaries in the Grid component, refer to the following topic: Summary in Blazor Grid.

Implements

RefreshSummary()