How to use NumberFormatInfo in the SummaryColumn of the GridTableSummaryRow?

In the SfDataGrid, you can use NumberFormatInfo in the SummaryColumn of the GridTableSummaryRow by deriving a new class from GridTableSummaryCellRenderer and override its OnUpdateEditBinding virtual method. 

public class GridTableSummaryCellRendererExt : GridTableSummaryCellRenderer
    {
        public override void OnUpdateEditBinding(DataColumnBase column, Syncfusion.UI.Xaml.Grid.GridTableSummaryCell element, object dataContext)
        {
            //Check whether the datacontext is SummaryRecordEntry
            var record = dataContext as SummaryRecordEntry;
            if (!(dataContext is SummaryRecordEntry))
                return;
 
            //Process each SummaryColumn and get the display text of corresponding summary
            foreach (ISummaryColumn summaryColumn in record.SummaryRow.SummaryColumns)
            {
                if (!summaryColumn.MappingName.Contains(column.GridColumn.MappingName))
                    continue;
 
                string summarytext = string.Empty;
                if (record.SummaryRow.ShowSummaryInRow)
                    summarytext = SummaryCreator.GetSummaryDisplayTextForRow(record, this.DataGrid.View);
                else
                    summarytext = SummaryCreator.GetSummaryDisplayText(record, column.GridColumn.MappingName, this.DataGrid.View);
 
                if (!string.IsNullOrEmpty(summarytext))
                {
                    //Create new number format and apply it to summary columns 
                    NumberFormatInfo format = new NumberFormatInfo();
                    format.NumberDecimalDigits = 3;
                    format.NumberDecimalSeparator = "*";
                    format.NumberGroupSeparator = ",";
                    //Number format is applied to summary columns
                    element.Content = Convert.ToDouble(double.Parse(summarytext, NumberStyles.Currency)).ToString("N", format);
                }
            }
        }
    }

Refer to the following code example to remove the default GridTableSummaryCellRenderer and add the customized GridTableSummaryCellRendererExt to the renderer’s collection in the SfDataGrid.

public MainWindow()
{
    InitializeComponent();
    //Customized GridTableSummaryCellRendererExt is added to the CellRenderers collection
    grid.CellRenderers.Remove("TableSummary");
    grid.CellRenderers.Add("TableSummary", new GridTableSummaryCellRendererExt()); 
}

The above formatting is applied to summary values as follows.

Figure 1:NumberFormatInfo is applied to summary values

Sample Links:

WPF

WinRT

WP

UWP