在哪里处理异步异常？

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
    }
}

If socket之后抛出异常BeginConnect返回和之前cbConnect被调用，它在哪里弹出？是否允许将其放入后台？

异步委托异常处理的代码示例msdn论坛 http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/750e0076-73a0-4a1d-b23a-93738ceed382。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);
    }
  }
}