c# - 我在哪里处理异步异常？

Question

考虑以下代码:

class Foo {
    // boring parts omitted

    private TcpClient socket;

    public void Connect(){
        socket.BeginConnect(Host, Port, new AsyncCallback(cbConnect), quux);
    }

    private void cbConnect(IAsyncResult result){
            // blah
    }
}

如果 socket 在 BeginConnect 返回之后和 cbConnect 被调用之前抛出异常，它会在哪里弹出？甚至可以在后台转换吗？

Answer 1

来自 msdn forum 的异步委托(delegate)的异常处理代码示例.我相信 TcpClient 模式将是相同的。

using System;
using System.Runtime.Remoting.Messaging;

class Program {
  static void Main(string[] args) {
    new Program().Run();
    Console.ReadLine();
  }
  void Run() {
    Action example = new Action(threaded);
    IAsyncResult ia = example.BeginInvoke(new AsyncCallback(completed), null);
    // Option #1:
    /*
    ia.AsyncWaitHandle.WaitOne();
    try {
      example.EndInvoke(ia);
    }
    catch (Exception ex) {
      Console.WriteLine(ex.Message);
    }
    */
  }

  void threaded() {
    throw new ApplicationException("Kaboom");
  }

  void completed(IAsyncResult ar) {
    // Option #2:
    Action example = (ar as AsyncResult).AsyncDelegate as Action;
    try {
      example.EndInvoke(ar);
    }
    catch (Exception ex) {
      Console.WriteLine(ex.Message);
    }
  }
}