如何处理多播委托例外在C＃中？ [英] How to handle exception in multicast delegate in C#?

问题描述

我一直在考虑一些代码，我通过多播委托调用。

I've been given some code that I am calling through multicast delegate.

我想知道我怎么能赶上和管理提出了有什么异常，未的时刻进行管理。我不能修改给出的代码。

I would like to know how I can catch up and manage any exception raised there and that is not managed for the moment. I cannot modify the code given.

我一直在找了一圈，发现大约需要调用GetInvocationList（），但不能确定这是否是有帮助的。

I've been looking around and found about the need to call GetInvocationList() but not really sure if this is helpful.

推荐答案

使用 GetInvocationList 考虑代码：

foreach (var handler in theEvent.GetInvocationList().Cast<TheEventHandler>()) {
   // handler is then of the TheEventHandler type
   try {
      handler(sender, ...);
   } catch (Exception ex) {
      // uck
   }
}   

---

这我的老办法，新办法，我更喜欢超过，因为它使调用一个单元，包括使用了/ ref参数（如果需要）。

---

This my old approach, the newer approach I prefer is above because it makes invocation a snap, including the use of out/ref parameters (if desired).

foreach (var singleDelegate in theEvent.GetInvocationList()) {
   try {
      singleDelgate.DynamicInvoke(new object[] { sender, eventArg });
   } catch (Exception ex) {
      // uck
   }
}

那些单独调用每个被调用过与代表

which individually calls each delegate that would have been invoked with

 theEvent.Invoke(sender, eventArg)

编码愉快。

的事件处理时，请记住做标准空后卫copy'n'check（也许锁）。

Remember to do the standard null-guard copy'n'check (and perhaps lock) when dealing with events.

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