新手。C#模仿一个简单聊天程序，出现System.Net.Sockets.SocketException”类型的未经处理的异常出现在 System.dll 中

Question

聊天异常c#

Answer 1

IP或Port若有问题，  就无法连接， 当然要报错。 你有什么想不通的？

Answer 2

 tcpClient.Connect(IPAddress.Parse(textBox1.Text), Int32.Parse(textBox2.Text));
NonBlockingprivate bool CheckConnectivityForProxyHost(IPEndPoint remoteEP)
        {            bool isUp = false;
            try
            {
                client.SendTimeout = 5000;
                client.ReceiveTimeout = 5000;
                CallWithTimeout( 50, client, remoteEP);
                if (client.Connected)
                {
                    isUp = true;
                }            }
            catch (Exception)
            {
                isUp = false;
            }
            finally
            {
                //try
                //{
                //    if (client != null)
                //    {
                //        client.Shutdown(SocketShutdown.Both);
                //    }
                //}
                //catch (Exception)
                //{                //}
                //finally
                //{
                //    if (client != null)
                //        client.Close();
                //}            }
            return isUp;
        }
        private void CallWithTimeout( int timeoutMilliseconds, Socket socket, IPEndPoint ipendPoint)
        {
            try
            {
                Action wrappedAction = () =>
                {
                    ConnectToProxyServers(socket, ipendPoint);
                };                IAsyncResult result = wrappedAction.BeginInvoke(null, null);                if (result.AsyncWaitHandle.WaitOne(timeoutMilliseconds))
                {
                    wrappedAction.EndInvoke(result);
                }            }
            catch (Exception)
            {            }
        }        private void ConnectToProxyServers(Socket testSocket, IPEndPoint ipEndPoint)
        {
            try
            {
                if (testSocket == null || ipEndPoint == null)
                    return;                testSocket.Connect(ipEndPoint);            }
            catch (Exception)
            {            }
        } 

Answer 3

我的想法是弹窗提示无法连接，而不是程序死掉。
加个try-catch在你的代码外就行了：         private void button3_Click(object sender, EventArgs e)
          {
              try
             {
              ///your code
             }
              catch(Exception ex)
              {
                  MessageBox.Show(ex.Message);
              }
          } 

Answer 4

我的想法是弹窗提示无法连接，而不是程序死掉。
加个try-catch在你的代码外就行了：         private void button3_Click(object sender, EventArgs e)
          {
              try
             {
              ///your code
             }
              catch(Exception ex)
              {
                  MessageBox.Show(ex.Message);
              }
          } 

非常感谢！

Answer 5

程序不会直接死掉，对于没有用到的IP Port会快速的返回结果，不会出现等待20秒以上的情况。