Socket.Receive() 卡住

Question

在大约两年内错过了 C# 并为服务器编写客户端后，我正在练习我的 C#。无论如何，问题是 Socket.Receive() 似乎被卡住了（我的循环实际上并没有通过，测试它）。这是我在 Program.cs 中的调用：

                byte[] buffer = new byte[7];
                hSocket.Receive(buffer, 0, buffer.Length, 500);

这是我的 APISocket.cs 的 sn-p

        public bool Connect(string ServerIP, int ServerPort, int Timeout)
        {
            TimeoutObject.Reset();
            SocketException = null;
            try
            {
                Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                IPEndPoint IPEndPoint = new IPEndPoint(IPAddress.Parse(ServerIP), ServerPort);
                object state = new object();
                Socket.BeginConnect(IPEndPoint, new AsyncCallback(CallBackMethod), state);

            if (TimeoutObject.WaitOne(Timeout, false))
            {
                if (IsConnected)
                    return true;
                else
                    return false;
            }
            else
            {
                return false;
            }

        }
        catch (Exception Ex)
        {
            SocketException = Ex;
        }

        return false;
    }

    private void CallBackMethod(IAsyncResult AsyncResult)
    {
        try
        {
            IsConnected = false;

            if (Socket.Connected)
            {
                IsConnected = true;
            }
        }
        catch (Exception Ex)
        {
            IsConnected = false;
            SocketException = Ex;
        }
        finally
        {
            TimeoutObject.Set();
        }
    }



    public void Receive(byte[] buffer, int offset, int size, int timeout)
    {
        SocketException = null;
        int startTick = Environment.TickCount;
        int received = 0;

        do
        {
            if (Environment.TickCount > startTick + timeout)
            {
                SocketException = new Exception("Timeout.");
                return;
            }

            try
            {
                received += Socket.Receive(buffer, offset + received, size - received, SocketFlags.None);
            }
            catch (SocketException Ex)
            {
                if (Ex.SocketErrorCode == SocketError.WouldBlock ||
                    Ex.SocketErrorCode == SocketError.IOPending ||
                    Ex.SocketErrorCode == SocketError.NoBufferSpaceAvailable)
                {
                    Thread.Sleep(30);
                }
                else
                {
                    SocketException = Ex;
                    return;
                }
            }
        } while (received < size);
    }

我不知道我哪里出错了，任何帮助将不胜感激..

Answer 1

Socket.Receive() 是一个阻塞调用。如果没有可用数据，它将阻塞，直到有数据可供读取。见MSDN。

If no data is available for reading, the Receive method will block until data is available, unless a time-out value was set by using Socket.ReceiveTimeout. If the time-out value was exceeded, the Receive call will throw a SocketException.