WPF DataGrid Grouping with sums and other fields

Question

I have a DataGrid that is bound to collection and that I want to be grouped. Here is the code

Collection:

private string _ID;
private string _Descri         


        

Answer 1

You could use a converter that's passed the Items property of the group header e.g.

<Window.Resources>
    <local:GroupsToTotalConverter x:Key="groupsConverter" />
</Window.Resources>

<Expander.Header>
    <StackPanel Orientation="Horizontal">
        <TextBlock Text="{Binding Path=Name}" Margin="5"/>
        <TextBlock Text="total" Margin="5" />
        <TextBlock Text="{Binding Path=Items, Converter={StaticResource groupsConverter}}" Margin="5" />
    </StackPanel>

where the converter performs the calculation and passes back the total as the string for the text block:

public class GroupsToTotalConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is ReadOnlyObservableCollection<Object>)
        {
            var items = (ReadOnlyObservableCollection<Object>)value;
            Decimal total = 0;
            foreach (GroupItem gi in items)
            {
                total += gi.Amount;
            }
            return total.ToString();
        }
        return "";
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return value;
    }
}

As for the description I'd suggest also grouping by that, and writing another converter to pull out the description from the Items in a similar manner to above.