WPF Two Datagrids One Selected Row

Question

I have two DataGrids and only want to have a selected row in one of the DataGrids at a time. when i make a selection in one DataGrid, the selected row in the other DataGrid should be removed. I have tried using the OnSelectionChanged even to change the selection in the opposing DataGrid, but this in turn caused the OnSelectionChanged even in the current DataGrid to be called, and i end up with no selection at all. Does anyone have any idea how to accomplish this?

<DataGrid x:Name="DataGrid1"
          DockPanel.Dock="Top" 
          ItemsSource="{Binding DataGrid1CollectionView}"
          SelectedItem="{Binding DataGrid1SelectedArisingGroup}"
          SelectionChanged="DataGrid1SelectionChanged"
>
</DataGrid>

<DataGrid x:Name="DataGrid2"
          DockPanel.Dock="Top" 
          ItemsSource="{Binding DataGrid2CollectionView}"
          SelectedItem="{Binding DataGrid2SelectedArisingGroup}"
          SelectionChanged="DataGrid2SelectionChanged"
>
</DataGrid>

private void DataGrid1SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            DataGrid2.SelectedItem=null;
        }

private void DataGrid2SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            DataGrid1.SelectedItem=null;
        }

Answer 1

You could unsubscribe/detach the SelectionChanged event of the second datagrid while a selection is done in the first datagrid & vice versa & then reattach after executing your logic - in this case unselecting the item.

I have written a code sample below for one of the datagrid's selection changed event. Extending it for the 2nd datagrid is pretty straight forward.

XAML:

<DataGrid x:name="dgr1" SelectionChanged="dgr1_Selection"/>
<DataGrid x:name="dgr2" SelectionChanged="dgr2_Selection"/>

Code Behind:

private void dgr1_Selection(object sender, SelectionChangedEventArgs e)
{
    dgr2.SelectionChanged -= dgr2_Selection;
    //unselecte the selected item of dgr2 - Set the IsSelected property of 
    //the Selected item to false or dgr2.SelectedItem=null
    dgr2.SelectionChanged += dgr2_Selection;
}