/// <summary>
/// Will create an event handler association for the current element.
/// </summary>
/// <remarks>
/// In contrast to method
/// <see cref="HandleMemberAssignment"/>,
/// this method can only be used for the current element, which is part of the
/// visual tree.
/// </remarks>
/// <param name="obj"><see cref="UIElement"/> which defines the event to assign the event
/// handler specified by <paramref name="value"/> to.</param>
/// <param name="evt"><see cref="RoutedEvent"/> which is defined on the class of
/// <paramref name="obj"/>.</param>
/// <param name="value">Name of the event handler to assign to the specified
/// event.</param>
protected void HandleEventAssignment(UIElement obj, RoutedEvent evt, string value)
{
if (_getEventHandler == null)
throw new XamlBindingException("Delegate 'GetEventHandler' is not assigned");
Delegate dlgt = _getEventHandler(this, evt.HandlerType.GetMethod("Invoke"), value);
try
{
obj.AddHandler(evt, dlgt);
}
catch (Exception e)
{
throw new XamlBindingException("Error assigning event handler", e);
}
}
/// <summary>
/// Will create an event handler association for the current element, using a command markup extension as handler.
/// </summary>
/// <param name="obj"><see cref="UIElement"/> which defines the event to assign the event
/// handler specified by <paramref name="commandStencil"/> to.</param>
/// <param name="evt"><see cref="RoutedEvent"/> which is defined on the class of <paramref name="obj"/>.</param>
/// <param name="commandStencil">Command stencil to be used as event handler.</param>
protected void HandleEventAssignment(UIElement obj, RoutedEvent evt, ICommandStencil commandStencil)
{
try
{
// initialize command extension
var evaluableMarkupExtension = commandStencil as IEvaluableMarkupExtension;
if (evaluableMarkupExtension != null)
{
evaluableMarkupExtension.Initialize(this);
}
// add the event handler to the event
obj.AddHandler(evt, commandStencil);
}
catch (Exception e)
{
throw new XamlBindingException("Error assigning event handler", e);
}
}