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WPF DataGrid (SfDataGrid) provides support to show the column summary. If the DataContext of SfDataGrid is ViewModel, you can bind SummaryColumns to a property in ViewModel using the AttachedProperty of type List<GridSummaryColumn>. Refer to the following code example to define the AttachedProperty of type List<GridSummaryColumn>. public class SfDataGridAttachedProperty
{
public static readonly DependencyProperty DynamicSummaryColumnsProperty = DependencyProperty.RegisterAttached("DynamicSummaryColumns",
typeof(List<GridSummaryColumn>),
typeof(SfDataGridAttachedProperty)
, new FrameworkPropertyMetadata(null, OnDynamicSummaryColumnsChanged));
public static void SetDynamicSummaryColumns(UIElement element, List<GridSummaryColumn> value)
{
element.SetValue(DynamicSummaryColumnsProperty, value);
}
public static List<GridSummaryColumn> GetDynamicSummaryColumns(UIElement element)
{
return (List<GridSummaryColumn>)element.GetValue(DynamicSummaryColumnsProperty);
}
private static void OnDynamicSummaryColumnsChanged(DependencyObject d, DependencyPropertyChangedEventArgs args)
{
SfDataGrid grid = d as SfDataGrid;
if (grid.TableSummaryRows.Count() > 1)
{
grid.TableSummaryRows.Clear();
}
GridTableSummaryRow gsr = new GridTableSummaryRow();
gsr.ShowSummaryInRow = false;
var list = ((List<GridSummaryColumn>)args.NewValue);
foreach (var item in list)
{
gsr.SummaryColumns.Add(item);
}
grid.TableSummaryRows.Add(gsr);
}
}
Refer to the following code example to populate GridSummaryColumn in Viewmodel. internal class ViewModel : INotifyPropertyChanged
{
private List<GridSummaryColumn> _summarycols;
public List<GridSummaryColumn> SummaryColumns
{
get { return _summarycols; }
set
{
_summarycols = value;
RaisePropertyChanged("SummaryColumns");
}
}
public ViewModel()
{
PopulateEmployeeDetails();
SetSummaryColumns();
}
private void SetSummaryColumns()
{
SummaryColumns = new List<GridSummaryColumn>();
SummaryColumns.Add(new GridSummaryColumn()
{
MappingName = "EmployeeID",
Name = "EmployeeID",
SummaryType = SummaryType.CountAggregate,
Format = "Total: {Count}"
});
SummaryColumns.Add(new GridSummaryColumn()
{
MappingName = "EmployeeSalary",
Name = "EmployeeSalary",
SummaryType = SummaryType.DoubleAggregate,
Format = "Total: {Sum}"
});
}
}
Refer to the following code example to bind the attached property in SfDataGrid. <Syncfusion:SfDataGrid x:Name="sfdatagrid"
local:SfDataGridAttachedProperty.DynamicSummaryColumns="{Binding SummaryColumns}"
ItemsSource="{Binding EmployeeDetails}">
</Syncfusion:SfDataGrid>
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