public void OnSerializingMethod(StreamingContext context)
{
foreach (var d in MyEvent.GetInvocationList())
{
MyEvent -= (PropertyChangedEventHandler)d;
}
}
public void DisplayEventInvocationList()
{
if (MyEvent != null)
{
foreach (Delegate d in MyEvent.GetInvocationList())
{
Console.WriteLine("Object: {0}, Method: {1}", (d.Target ?? "null").ToString(), d.Method);
}
}
}
/// <summary>
/// When disposing unsubscibe from all events
/// </summary>
public void Dispose()
{
if (MyEvent != null)
{
foreach (Delegate del in MyEvent.GetInvocationList())
{
MyEvent -= (del as EventHandler);
}
}
// do the same for any other events in the class
// ....
}
public void DoSomething()
{
//if (MyEvent != null)
//{
// //获取订阅者列表
// Delegate[] delArray = MyEvent.GetInvocationList();
// foreach (Delegate del in delArray)
// {
// EventHandler method = (EventHandler)del; // 强制转换为具体的委托类型
// try
// {
// method(this, EventArgs.Empty);
// }
// catch (Exception e)
// {
// Console.WriteLine("Exception: {0}", e.Message);
// }
// }
//}
//以上代码可以使用下面的方法代替
if (MyEvent != null)
{
Delegate[] delArray = MyEvent.GetInvocationList();
foreach (Delegate del in delArray)
{
try
{
// 使用DynamicInvoke方法触发事件
del.DynamicInvoke(this, EventArgs.Empty);
}
catch (Exception e)
{
Console.WriteLine("Exception: {0}", e.Message);
}
}
}
//下面代码一旦有异常发生，会影响其他订阅者的代码不被执行
// 做某些其他的事情
//if (MyEvent != null)
//{
// try
// {
// MyEvent(this, EventArgs.Empty);
// }
// catch (Exception e)
// {
// Console.WriteLine("Exception: {0}", e.Message);
// }
//}
}
public void DoSomething()
{
Console.WriteLine("Do something invoked");
if (MyEvent != null)
{
Delegate[] delArray = MyEvent.GetInvocationList();
foreach (var del in delArray)
{
EventHandler method = (EventHandler)del;
method.BeginInvoke(null, EventArgs.Empty, null, null);
}
}
}
public void DoSomething()
{
if (MyEvent != null)
{
Delegate[] delArray = MyEvent.GetInvocationList();
foreach (Delegate del in delArray)
{
try
{
del.DynamicInvoke(this, EventArgs.Empty);
}
catch (Exception e)
{
Console.WriteLine("Exception:{0}", e.Message);
}
}
}
}
public void DoSomething()
{
Console.WriteLine("DoSomething Invoke !");
if (MyEvent != null)
{
Delegate[] delArray = MyEvent.GetInvocationList();
foreach (Delegate del in delArray)
{
try
{
EventHandler method = (EventHandler)del;
method.BeginInvoke(null, EventArgs.Empty, null, null);
//对于多个订阅者注册的情况，必须使用GetInvocationList()获得所有委托对象，
///然后遍历它们，分别在其上调用BeginInvoke()方法
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
}
public IEnumerable <EventHandler> GetMyEventHandlers()
{
return(from d in MyEvent.GetInvocationList()
select(EventHandler) d);
}