/// <summary>
/// Raises the TemplateRequested event up the 'container' element's logical tree
/// so that the DataTemplate to return can be determined.
/// </summary>
/// <param name="item">The data object being templated.</param>
/// <param name="container">The element which contains the data object.</param>
/// <returns>The DataTemplate to apply.</returns>
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
// We need 'container' to be a UIElement because that class
// exposes the RaiseEvent method.
UIElement templatedElement = container as UIElement;
if (templatedElement == null)
throw new ArgumentException("RoutedDataTemplateSelector only works with UIElements.");
// Bubble the TemplateRequested event up the logical tree, starting at the templated element.
// This allows the outside world to determine what template to use.
TemplateRequestedEventArgs args = new TemplateRequestedEventArgs(TemplateRequestedEvent, templatedElement, item);
templatedElement.RaiseEvent(args);
// Return the DataTemplate selected by the outside world.
return args.TemplateToUse;
}
/// <summary>
/// Raises the TemplateRequested event up the 'container' element's logical tree
/// so that the DataTemplate to return can be determined.
/// </summary>
/// <param name="item">The data object being templated.</param>
/// <param name="container">The element which contains the data object.</param>
/// <returns>The DataTemplate to apply.</returns>
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
// We need 'container' to be a UIElement because that class
// exposes the RaiseEvent method.
UIElement templatedElement = container as UIElement;
if (templatedElement == null)
{
throw new ArgumentException("RoutedDataTemplateSelector only works with UIElements.");
}
// Bubble the TemplateRequested event up the logical tree, starting at the templated element.
// This allows the outside world to determine what template to use.
TemplateRequestedEventArgs args = new TemplateRequestedEventArgs(TemplateRequestedEvent, templatedElement, item);
templatedElement.RaiseEvent(args);
// Return the DataTemplate selected by the outside world.
return(args.TemplateToUse);
}