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How to deselect Datagrid modified event in WPF?

I know this question was asked before, but I could not find what I was looking for.

    private void dataGrid1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

if (oOrdItem.ItemNo == 0)
                {
                    e.Handled = true;
                    MessageBox.Show("Please save the order item", "Save");
                    return;
                }
}

Even if I call e.Handled = true; it, it will select the datagrid row. I do not want to call dataGrid1.SelectedIndex =-1;, because it will raise the selectchanged event again. I also tried. dataGrid1.UnSelectAll(); Any other way to cancel the selectedchanged event?

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2 answers

Have you considered an alternative implementation? I think about Bindingand method of checking before the change SelectedItem. Illustration:

<DataGrid ItemsSource="..." SelectedItem="{Binding SelectedEntry}" />

and the underlying virtual machine might look like this:

public class SampleVm : ViewModelBase//assuming that you are using such a base class
{
   private object _selectedEntry;
   public object SelectedEntry
   {
       get { return _selectedEntry; }
       set 
       {
           if (!SavePrevItem())
               return;

           _selectedEntry = value;
           RaisePropertyChanged("SelectedItem"); // or something similar
       }
   }

   private bool SavePrevItem()
   {
       // your logic here
   }
}
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PreviewMouseDown datagrid:

private void dataGrid_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    //get the item I am clicking on (replace MyDataClass with datatype in datagrid)
    var myItem = (e.OriginalSource as FrameworkElement).DataContext as MyDataClass;

    //check if item is different from currently selected item
    if (myItem != dataGrid.SelectedItem)
    {
         //save message dialog
         MessageBoxResult result = MessageBox.Show("Changes will be lost. Are you sure?", "Confirmation", MessageBoxButton.YesNo, MessageBoxImage.Question);

         //if click no, then cancel the event
         if (result == MessageBoxResult.No)
         {
             e.Handled = true;
         }
         else
         {
           //otherwise, reinvoke the click event
           dataGrid.Dispatcher.BeginInvoke(
              new Action(() =>
              {
                 RoutedEventArgs args = new MouseButtonEventArgs(e.MouseDevice, 0, e.ChangedButton);
                 args.RoutedEvent = UIElement.MouseDownEvent;
                 (e.OriginalSource as UIElement).RaiseEvent(args);
              }),
              System.Windows.Threading.DispatcherPriority.Input);
           }
        }
    }
}

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