tcpclient stem.IO.IOException上的并行调用：无法从传输连接中读取数据：连接尝试失败，因为已连接

Question

我有一个类实例，我在其中管理登录/心跳以及实际工作项数据包在tcp客户端上的发送接收。

问题是当我尝试并行调用ProcessCommand时出现错误

System.IO.IOException：无法从传输连接中读取数据：连接尝试失败，因为一段时间后被连接方未正确响应，或者由于连接的主机未能响应而建立的连接失败。 ---> System.Net.Sockets.SocketException：连接尝试失败，因为一段时间后连接方未正确响应，或者由于连接的主机未能响应而建立连接失败

public class TcpCommunicationManager
{        
    private TcpClient client = null;
    public TcpCommunicationManager(string ip, int port)
    {
        Ip = ip;
        Port = port;
    }



    public SSMIResponse ProcessCommand(SSMIRequest request)
    {

        SSMIResponse response = new SSMIResponse();
        if (request.CmdType == CommandType.Login)
        {
            client = new TcpClient(Ip, Port);             
        }

        response.RequestedCommand = GetCommandTextFromRequest(request);
        byte[] buf = Encoding.ASCII.GetBytes(response.RequestedCommand);
        var stream = client.GetStream();
        request.RequestTime = DateTime.Now;

        var result = stream.WriteAsync(buf, 0, buf.Length);
        Console.WriteLine("Request Command:" + response.RequestedCommand);
        response.SendSuccess = true;

        var data = new Byte[1024];


            stream.ReadTimeout = 1000 * 5; //5 seconds


            // Read the first batch of the TcpServer response bytes.
            var bytes = stream.Read(data, 0, data.Length);
            response.ResponseTime = DateTime.Now;
            response.ResponseRawResultPacket = Encoding.ASCII.GetString(data, 0, bytes);
            ProcessResponseResult(request, response);
            Console.WriteLine("Response Received:" + response.ResponseRawResultPacket + Environment.NewLine);
        return response;
    }        
}