socket程序得挂起C＃ [英] socket program get hangs C#

问题描述

我的c＃程序在运行时会挂起。任何人都可以告诉我为什么

  private   void  button1_Click（ object  sender，EventArgs e）
 {
 
 sck =  new  Socket（AddressFamily.InterNetwork，SocketType.Stream，ProtocolType.Tcp）; 
 IPEndPoint localEndPoint =  new  IPEndPoint（IPAddress.Parse（  192.168.0.177）， 80 ）; 
 textBox2.Text = localEndPoint.ToString（）; 
 尝试 
 {
 sck.Connect（localEndPoint）; 
  byte  [] bytes =  new   byte  [ 25 ]; 
 sck.Receive（bytes）;  //  挂在这里 
 
  string  myString = System.Text.Encoding.UTF8.GetString（bytes）; 
 
 
 textBox1.Text = myString +   a; 
 sck.Close（）; 
} 
  catch  
 {
 Console.Write（ 无法连接\\\\ n）; 
 textBox1.Text =   error; 
} 
 
 
} 

解决方案

它因为 receive 是一个阻塞调用：如果没有要接收的数据，则等待。这就是为什么它通常在一个单独的线程中调用的原因。


[update]

有一个在MSDN上查看异步客户端套接字示例[ ^ ]。

[/ update]

您必须为套接字连接设置TimeOut属性，因为如果您没有设置超时sockect一直等待数据到达并挂起你的程序执行。



可能的解决方案是使用异步方法。

异步客户端套接字连接 [ ^ ]

Gi tHub使用异步套接字客户端演示项目 [ ^ ]

my c# program get hang when it run . Can any one please tell me why

private void button1_Click(object sender, EventArgs e)
        {
           
            sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse("192.168.0.177"), 80);
            textBox2.Text = localEndPoint.ToString();
            try
            {
                sck.Connect(localEndPoint);
                byte[] bytes = new byte[25];
                 sck.Receive(bytes);//got hang here

               string myString = System.Text.Encoding.UTF8.GetString(bytes);

                
               textBox1.Text = myString+" a";
                sck.Close();
            }
            catch
            {
                Console.Write("Unable to Connect \r\n");
                textBox1.Text = "error";
            }
            
           
        }

解决方案

It hangs because receive is a blocking call: if there is no data to receive then it waits. This is the reason why it is usually invoked in a separate thread.

[update]
Have a look at "Asynchronous Client Socket Example" at MSDN[^].
[/update]

You have to set the TimeOut properties for the socket connection because if you don't set a timeout the sockect keep waiting until data arrives and hangs your program execution.

The possible solution is using Async method.
Asynchronous Client Socket Connection[^]
GitHub Demo Project using Asynchronous Socket Client[^]

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