C # Clear the original event handler in others' controls

Sometimes we use others' controls, but this control itself has attached an event handler to DoubleClick. For example, when we double-click this control, a form will pop up, but we do not want this form, but we cannot use DoubleClick-= ...... This event handler is written by someone else and is not in our code. How can we get rid of the original DoubleClick handler at this time?

Assume that the control class we use is testcontrol, and an instance is testcontrol1. The control itself has a DoubleClick processing method, which is a pop-up form. In this case, I want to block it. You can do this:

Type t = typeof (testControl); // or Type t = testControl1.GetType (); PropertyInfo propInfo = t. getProperty ("Events", BindingFlags. instance | BindingFlags. nonPublic); EventHandlerList eventHandlers = (EventHandlerList) propInfo. getValue (testControl1, null); FieldInfo fieldInfo = typeof (Control ). getField ("EventDoubleClick", BindingFlags. static | BindingFlags. nonPublic); Delegate del = eventHandlers [fieldInfo. getVa Lue (testControl1)]; if (del! = Null) {foreach (Delegate temp in del. getInvocationList () {eventHandlers. removeHandler (fieldInfo. getValue (null), temp) ;}/// add our own event handler testControl1.DoubleClick + = new EventHandler (testControl1_DoubleClick) for this event );

 

OK!

 

Another method:

Type t = m_MapService.GetType (); // or Type t = testControl1.GetType ();

FieldInfo finfo = t. GetField ("OnZBST", BindingFlags. NonPublic | BindingFlags. Instance );
Delegate instanceDelegate = finfo. GetValue (m_MapService) as Delegate;
EventInfo eve = t. GetEvent ("OnZBST ");
Foreach (Delegate d in instanceDelegate. GetInvocationList ())
{
Eve. RemoveEventHandler (m_MapService, d );
}

I thought I was using it!