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Remove event handlers from a WPF Control
draco1023 edited this page Oct 29, 2014
·
1 revision
/// <summary>
/// Removes all event handlers subscribed to the specified routed event from the specified element.
/// </summary>
/// <param name="element">The UI element on which the routed event is defined.</param>
/// <param name="routedEvent">The routed event for which to remove the event handlers.</param>
public static void RemoveRoutedEventHandlers(UIElement element, RoutedEvent routedEvent)
{
// Get the EventHandlersStore instance which holds event handlers for the specified element.
// The EventHandlersStore class is declared as internal.
var eventHandlersStoreProperty = typeof(UIElement).GetProperty(
"EventHandlersStore", BindingFlags.Instance | BindingFlags.NonPublic);
object eventHandlersStore = eventHandlersStoreProperty.GetValue(element, null);
if (eventHandlersStore == null) return;
// Invoke the GetRoutedEventHandlers method on the EventHandlersStore instance
// for getting an array of the subscribed event handlers.
var getRoutedEventHandlers = eventHandlersStore.GetType().GetMethod(
"GetRoutedEventHandlers", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
var routedEventHandlers = (RoutedEventHandlerInfo[])getRoutedEventHandlers.Invoke(
eventHandlersStore, new object[] { routedEvent });
// Iteratively remove all routed event handlers from the element.
foreach (var routedEventHandler in routedEventHandlers)
element.RemoveHandler(routedEvent, routedEventHandler.Handler);
}