如何从一个event事件的委托列表上移除事件
前些天有同事问我怎么从一个Button的Click事件中移除所有委托,我想了一下可以这样来做:
public void RemoveEvent(Control c)
{
PropertyInfo propertyInfo = (typeof(System.Windows.Forms.Button)).GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
EventHandlerList eventHandlerList = (EventHandlerList)propertyInfo.GetValue(c, null);
FieldInfo fieldInfo = (typeof(Control)).GetField("EventClick", BindingFlags.Static | BindingFlags.NonPublic);
Delegate d = eventHandlerList[fieldInfo.GetValue(null)];
if (d != null)
{
foreach (Delegate temp in d.GetInvocationList())
{
c.Click -= (EventHandler)temp;
}
}
}
{
PropertyInfo propertyInfo = (typeof(System.Windows.Forms.Button)).GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic);
EventHandlerList eventHandlerList = (EventHandlerList)propertyInfo.GetValue(c, null);
FieldInfo fieldInfo = (typeof(Control)).GetField("EventClick", BindingFlags.Static | BindingFlags.NonPublic);
Delegate d = eventHandlerList[fieldInfo.GetValue(null)];
if (d != null)
{
foreach (Delegate temp in d.GetInvocationList())
{
c.Click -= (EventHandler)temp;
}
}
}
基本原理还是通过反射来做,获取字段的委托列表后再进行处理((EventHandlerList)propertyInfo.GetValue(c, null)可以获取委托列表),通过Reflector可以看到如下信息: