socket服务端的错误,帮忙看看.

[xieyueqing]

我用C#写的socket服务器端，客户端是别人用Delhpi写的，两者用winsock通讯。

现在测试用大量客户端连接服务端，出现大量错误：

13:49:54 <SYS>MBoxSocketServer.OnRecieve异常：System.Net.Sockets.SocketException: 由于以前的关闭调用，套接字在那个方向已经关闭，发送或接收数据的请求没有被接受。
   在 System.Net.Sockets.Socket.BeginReceive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, AsyncCallback callback, Object state)
   在 MBoxServer.MBoxSocketServer.OnRecieve(IAsyncResult IR)

高手帮忙看看是因为什么原因，谢谢！

代码如下：

//异步接收数据
        private void OnRecieve(IAsyncResult IR)
        {
            if (sNo >= 2000000000)  //防止溢出
                sNo = 1;
            else
                sNo++;

            string sRemote = "";
            RCommDataBlock rcdb = new RCommDataBlock();
            RCommDataBlock rcdb1 = new RCommDataBlock();
            Socket RecSocket = (Socket)IR.AsyncState;
            sRemote = RecSocket.RemoteEndPoint.ToString();
            try
            {
                //Console.WriteLine("");
                //Console.WriteLine("<SYS>MBoxSocketServer.OnRecieve:接收到请求  (" + sNo.ToString() + ")  " + DateTime.Now.ToString("HH:mm:ss"));
                
                int isize = RecSocket.EndReceive(IR);

                rcdb = Buff2Block(InfoBuff);
                
                //*调试信息*
                CommUnits.PrintBlock(rcdb);

                ClientData UserSession;
                if (htSession.Contains(sRemote))
                    UserSession = (ClientData)htSession[sRemote];
                else
                    throw new Exception("没有找到该客户端的ClientData!");


                //****调用业务处理***********************
                MainUnit mu = new MainUnit();
                rcdb1 = mu.DoWork(rcdb, UserSession);
                //***************************************


                byte[] returnbuff = new byte[buffsize];
                returnbuff = Block2Buff(rcdb1);
                //Console.WriteLine("<SYS>MBoxSocketServer.OnRecieve:return!");
                RecSocket.Send(returnbuff);

                if ((isize == 0))
                {
                    RecSocket.Shutdown(SocketShutdown.Both);
                    RecSocket.Disconnect(false);
                }

                InfoBuff = new byte[buffsize];

                RecSocket.BeginReceive(InfoBuff, 0, InfoBuff.Length, SocketFlags.None, OnRecieve, RecSocket);
            }
            catch (SocketException er)
            {
                if (er.ErrorCode == 10054 || er.ErrorCode == 10053)
                {
                    htSession.Remove(sRemote);
                    //Console.WriteLine("");
                    //Console.WriteLine("<SYS>MBoxSocketServer.OnRecieve:连接已中断!");
                    CommUnits.WriteLog("<SYS>MBoxSocketServer.OnRecieve:连接已中断!");
                }
                else 
                    //Console.WriteLine("<SYS>MBoxSocketServer.OnRecieve异常：" + er.ToString());
                    CommUnits.WriteLog("<SYS>MBoxSocketServer.OnRecieve异常：" + er.ToString());
            }
        }

[使我做你和平之子]

if ((isize == 0))
{
RecSocket.Shutdown(SocketShutdown.Both);
RecSocket.Disconnect(false);
}
这里都关了，怎么下面还有

RecSocket.BeginReceive(InfoBuff, 0, InfoBuff.Length, SocketFlags.None, OnRecieve, RecSocket);