How to refresh a binding of the itemssource of a combobox programmatically?

Question

I found some items regarding this questions on SO, but they do not satisfy me. They talk about INotifyProperyChanged, but that does not help in my case.

I have a Combobox. For the ItemsSource, I use a MultiBinding and a Converter to create an ICollectionView. The ICollectionView gets bound to the ItemsSource.

On the GotFocus-event, this binding needs to be refreshed, so the converter gets fired again.

How can I do this?

Answer 1

If you can access your ICollectionView in your code behind, you might want to try the Refresh method...

Hope this helps..

Answer 2

Ok, a collegue helped me out.

This is the solution:

private void theComboBox_OnGotFocus(object sender, RoutedEventArgs e)
{
 ComboBox theComboBox = sender as ComboBox;

 if (theComboBox != null)
 {
  MultiBindingExpression binding = BindingOperations.GetMultiBindingExpression(theComboBox, ComboBox.ItemsSourceProperty);
  if (binding != null)
  {
   binding.UpdateTarget();
  }
 }
}