There might be an easier way to do this but I got it to work by using the GetIndex() method on the DataGridRow class. This returns the index in to the data source so might not be exactly what you're after.
![enter image description here](https://i.stack.imgur.com/sgXHs.png)
the xaml
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:local="clr-namespace:WpfApplication1"
Title="MainWindow" Height="350" Width="525">
<DataGrid>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding RelativeSource={RelativeSource AncestorType=DataGridRow}, Converter={local:RowToIndexConverter}}" />
</DataGrid.Columns>
<DataGrid.Items>
<sys:String>a</sys:String>
<sys:String>b</sys:String>
<sys:String>c</sys:String>
<sys:String>d</sys:String>
<sys:String>e</sys:String>
</DataGrid.Items>
</DataGrid>
</Window>
and the converter.
public class RowToIndexConverter : MarkupExtension, IValueConverter
{
static RowToIndexConverter converter;
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
DataGridRow row = value as DataGridRow;
if (row != null)
return row.GetIndex();
else
return -1;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (converter == null) converter = new RowToIndexConverter();
return converter;
}
public RowToIndexConverter()
{
}
}
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