C# 强制关闭socket后进入死循环问题(转)

最近在写异步TCP程序，在调试时遇到了Client关闭后程序在接收回调里死循环，用client.Connected
检测好像也没用，在网上找到几篇用Socekt检测的文章，都还可以达到Client强行关闭后程序在退出死循环的功能。

本人这个是在原有的程序上加了一个小小的判断条件就实现了，相比起来也是比较简单的，其主要代码如下：

private void AcceptConnect()
{
     IPAddress[] ip =
Dns.GetHostAddresses(Dns.GetHostName());
     listener = new
TcpListener(ip[0], 60000);
     listener.Start();          
     while
(isExit ==false)
     {
        try
        
{                    
   allDone.Reset();
           
AsyncCallback callback = new
AsyncCallback(AcceptTcpClientCallback);
            Console.Write("开始等待客户接入
\n\r");
            listener.BeginAcceptTcpClient(callback,
listener);
            allDone.WaitOne();
         }
          catch
(Exception err)
          {

             Console.Write(err.ToString());
             
break;
           }
      }
}

private void AcceptTcpClientCallback(IAsyncResult ar)
{          
    
TcpListener myListener = (TcpListener)ar.AsyncState;
    try
   
{
        allDone.Set();               
        TcpClient client =
myListener.EndAcceptTcpClient(ar);
        AlarmTCPObject readWriteObject =
new AlarmTCPObject(client);               
        Console.Out.Write("已经接受"
+ client.Client.RemoteEndPoint.ToString() + "连接");               
        
SendString(readWriteObject, "服务器已经接受连接，请通话");
       
readWriteObject.netStream.BeginRead(readWriteObject.readBytes, 0,
readWriteObject.readBytes.Length, ReadCallback, readWriteObject);               

    }
    catch (Exception err)
    {
        return;
   
}
}

private void ReadCallback(IAsyncResult ar)
{           
    try
   
{
        AlarmTCPObject readWriteObject =
(AlarmTCPObject)ar.AsyncState;
        int Count =
readWriteObject.netStream.EndRead(ar);
        byte[] TempForXmsg = new
byte[Count];
        Console.Out.Write(string.Format("来自{0}:{1}\r\n",
readWriteObject.client.Client.RemoteEndPoint,
System.Text.Encoding.ASCII.GetString(readWriteObject.readBytes, 0,
Count)));
        
        if (isExit == false && Count !=0)         //添加的Count !=0 就可以退出死循环,
        {
          
readWriteObject.InitReadArray();                   
           
readWriteObject.netStream.BeginRead(readWriteObject.readBytes, 0,
readWriteObject.readBytes.Length, ReadCallback, readWriteObject);    

        }               
    }
    catch (Exception err)
   
{             
        Console.Write(err.ToString());               
   
}
}