How to Show Row Index in Row Header in WPF DataGrid?

This sample illustrates how to show row index in row header in the WPF DataGrid (SfDataGrid).

DataGrid consider the GridSummaryRow and StackedHeaderRow while getting the data row index. You can avoid these rows by adding the converter to Text property of TextBlock.

XAML

<Style TargetType="syncfusion:GridRowHeaderCell">
    <Setter Property="Background" Value="Transparent" />
    <Setter Property="BorderBrush" Value="Gray" />
    <Setter Property="BorderThickness" Value="0,0,1,1" />
    <Setter Property="Padding" Value="0,0,0,0" />
    <Setter Property="FontFamily" Value="Segoe UI" />
    <Setter Property="FontSize" Value="12" />
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="IsTabStop" Value="False" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="syncfusion:GridRowHeaderCell">
                <Border
                    x:Name="PART_RowHeaderCellBorder"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}">
                    <Grid>
                        <TextBlock Text="{Binding RowIndex, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource rowIndexValueconverter}}" />
                    </Grid>
                </Border>

            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

C#

public class RowIndexValueConverter : IValueConverter
{
    SfDataGrid dataGrid = Application.Current.MainWindow.FindName("sfDataGrid") as SfDataGrid;

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        int firstRowIndex = dataGrid.GetFirstDataRowIndex();
        int lastRowIndex = dataGrid.GetLastDataRowIndex();
        if (value == null || (int)value > lastRowIndex || (int)value < firstRowIndex)
            return string.Empty;
        return (int)value - firstRowIndex + 1;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Requirements to run the demo

Visual Studio 2015 and above versions