Question

I can add a Combobox to a DataGrid using following xmal:

 <local:DataGridTemplateColumn Header="SomeHeader" Width="106" HeaderStyle="{StaticResource headerAlignRightStyle}" CellStyle="{StaticResource cellAlignRightStyle}">
                    <local:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding SomeProp}" Margin="4"/>
                        </DataTemplate>
                    </local:DataGridTemplateColumn.CellTemplate>
                    <local:DataGridTemplateColumn.CellEditingTemplate>
                        <DataTemplate>
                            <ComboBox 
                              x:Name="SomeCombo"
                              SelectionChanged="SomeCombo_SelectionChanged"
                              ItemsSource="{Binding SomeList}"
                              DisplayMemberPath="Name" 
                              />
                        </DataTemplate>
                    </local:DataGridTemplateColumn.CellEditingTemplate>
                </local:DataGridTemplateColumn>

However what I can’t figure out is a sensible way to get the row that was combox is
bound to. i.e. when handling the combobox SelectionChanged event I have no way of knowing what
what row the combobox belongs to. Particularly I don’t know what object in the DataGrid datasource
that the combobox is refering to.

Any help would be much appreciated.

Answer 1

you could

A) Bind the SelectedItem property of the ComboBox to a property in your ViewModel/data model using a two way binding, so you wouldn’t have to worry about SelectionChanged in the first place

or

B) Use DataGridRow.GetRowContainingElement(element) in your SelectionChanged handler, i.e.

private void SomeCombo_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    var comboBox = sender as ComboBox;
    if (comboBox == null)
        return;
    var row = DataGridRow.GetRowContainingElement(comboBox);
    // Do something with row...
}

Cheers, Alex