private void Window_Error(object sender, ValidationErrorEventArgs e)
{
var src = (DependencyObject)e.OriginalSource;
switch (e.Action)
{
case ValidationErrorEventAction.Added:
if (errorControls.Add(src))
{
OKCommand.OnCanExecuteChanged();
ApplyCommand.OnCanExecuteChanged();
if (e.OriginalSource is FrameworkElement)
{
((FrameworkElement)e.OriginalSource).Unloaded += Control_Unloaded;
}
}
break;
case ValidationErrorEventAction.Removed:
if (!Validation.GetHasError((DependencyObject)e.OriginalSource))
{
if (errorControls.Remove(src))
{
OKCommand.OnCanExecuteChanged();
ApplyCommand.OnCanExecuteChanged();
if (e.OriginalSource is FrameworkElement)
{
((FrameworkElement)e.OriginalSource).Unloaded -= Control_Unloaded;
}
}
}
break;
}
}
private void Control_Unloaded(object sender, RoutedEventArgs e)
{
if (sender is FrameworkElement)
{
((FrameworkElement)sender).Unloaded -= Control_Unloaded;
}
errorControls.Remove((DependencyObject)sender);
OKCommand.OnCanExecuteChanged();
ApplyCommand.OnCanExecuteChanged();
}