关于网络编程

Question

   private void FrmMain_Load(object sender, EventArgs e)
        {
            FrmMain.CheckForIllegalCrossThreadCalls = false;
            FrmMain.Data = new Thread(new ThreadStart(this.DataStart));
            FrmMain.Data.Start();
             
        }
窗口启动，开启data线程；
  public void DataStart()
        {
            while (true)
            {
                try
                {
                    if (client.Connected)
                    {
                       
                        NetworkStream ns = new NetworkStream(client);
                        StreamReader reader = new StreamReader(ns);                        string result = reader.ReadLine();
                        byte[] u = utf8.GetBytes(result);
                        byte[] gb = Encoding.Convert(utf8, gb2312, u);
                        string sGb = gb2312.GetString(gb);
      }
     }
    }
}上面的方法来接受服务端的信息，请高手看看那边出错了.while (true)
            {
                try
                {
                    if (client.Connected)
                    {
 NetworkStream ns = new NetworkStream(client);
                        StreamReader reader = new StreamReader(ns);这边调试时ns会出异常.IOexception

Answer 1

ns是空的.但是clinet不是空的.把clinet！=null换成clinet.connected，也还是会有这个异常

Answer 2

NetworkStream ns = new NetworkStream(client);
if(ns!=null)
{
                        StreamReader reader = new StreamReader(ns);                        string result = reader.ReadLine();
                        byte[] u = utf8.GetBytes(result);
                        byte[] gb = Encoding.Convert(utf8, gb2312, u);
                        string sGb = gb2312.GetString(gb);
}断点跟一下，看看ns 为什么为null

Answer 3

NetworkStream ns = new NetworkStream(client);
是否获取到值，应该是IO问题

Answer 4

socket 未连接。或socket 的 SocketType 属性不是 SocketType.Stream。- 或 - socket 处于非阻止状态。

Answer 5

弱弱的问一句 你那client对象是什么？socket还是TcpClient

Answer 6

 client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
这个是定义的socket

Answer 7

为什么不用TcpClient.GetStream()来获取NetworkStream？
不过你还是用TcpClient.Client来接收发送数据的好，NetworkStream没有直接操作Socket的好。