How would it be possible to remove all event handlers of the 'Click' event of a 'Button'?

Question

I have a button control, and I\'d need to remove all the event handlers attached to its Click event.

How would that be possible?

Button button = GetB         


        

Answer 1

Just wanted to expand on Douglas' routine slightly, which I liked very much. I found I needed to add the extra null check to eventHandlersStore to handle any cases where the element passed didn't have any events attached yet.

/// 

/// Removes all event handlers subscribed to the specified routed event from the specified element.
/// 
/// The UI element on which the routed event is defined.
/// The routed event for which to remove the event handlers.
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);
}