解决C#网络通信编程的阻塞问题

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  网络编程分为阻塞和非阻塞两种方式,如果选择了阻塞方式进行编程,控制不好很容易导致程序死掉。

  下面这段代码中:

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TcpListener tcpListener = null;
TcpClient tcpClient = null;
NetworkStream networkStream = null;

    /// <summary>    /// 接收线程    /// </summary>    private void receive()    {        while (true)        {            Thread.Sleep(TimeSpan.FromSeconds(1));            this.AddTextToCommStateList(DateTime.Now.ToString() + "\t等待连接...");            tcpClient = tcpListener.AcceptTcpClient();            Thread.Sleep(TimeSpan.FromSeconds(1));            this.AddTextToCommStateList(DateTime.Now.ToString() + "\t已连接");            networkStream = tcpClient.GetStream();            // 设置读取超时时间为10秒            networkStream.ReadTimeout = 10000;            // 设置写入超时时间为10秒            networkStream.WriteTimeout = 10000;            byte[] recvBuff = new byte[8192];            int readBytes = 0;            while (tcpClient != null)            {                try                {                    this.AddTextToCommStateList(DateTime.Now.ToString() + "\t开始读取");                    readBytes = networkStream.Read(recvBuff, 0, recvBuff.Length);                    this.AddTextToCommStateList(DateTime.Now.ToString() + "\t读取完毕");                }                catch (IOException ex)                {                    this.AddTextToCommStateList(DateTime.Now.ToString() + "\t接收错误");                    this.AddTextToCommStateList(DateTime.Now.ToString() + "\t错误信息:" + ex.Message);                    break;                }    ...

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  如果去掉networkStream.ReadTimeout = 10000;和networkStream.WriteTimeout = 10000;两行,程序就有可能在

  readBytes = networkStream.Read(recvBuff, 0, recvBuff.Length);处死掉(笔者在调试到此时将网线拔掉,发现程序就会死在这里,即使网络恢复了程序也不会恢复)。

  查看MSDN中关于NetworkStream类的帮助信息,发现ReadTimeout和WriteTimeout属性的默认值都是Infinite(无限),即永不超时,所以networkStream.Read在读不到数时就永远不会返回。

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