如果我已经连接到服务器。那么我如何显示异常说它已经连接

-1

如果用户点击连接而没有输入任何输入，如何在异常情况下显示输入必须输入？我希望有一个消息框显示，如果用户点击连接按钮，而不输入名称，IP和端口。 [解决]如果我已经连接到服务器。那么我如何显示异常说它已经连接

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.Net.Sockets; 
using System.Threading; 

namespace SocketClient 
{ 

    public partial class SocketClient : Form 
    { 
     System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient(); 
     NetworkStream serverStream = default(NetworkStream); 
     string readData = null; 


     public SocketClient() 
     { 
      InitializeComponent(); 
     } 


     private void getMessage() 
     { 
      while (true) 
      { 
       serverStream = clientSocket.GetStream(); 
       int buffSize = 0; 
       byte[] inStream = new byte[10025]; 
       buffSize = clientSocket.ReceiveBufferSize; 
       serverStream.Read(inStream, 0, buffSize); 
       string returndata = System.Text.Encoding.ASCII.GetString(inStream); 
       readData = "" + returndata; 
       msg(); 
      } 
     } 


     private void msg() 
     { 
      if (this.InvokeRequired) 
       this.Invoke(new MethodInvoker(msg)); 
      else 
       textDisplay.Text = textDisplay.Text + Environment.NewLine + " >> " + readData; 
     } 


     private void buttonConnect_Click(object sender, EventArgs e) 
     { 

      readData = "Conected to NYP Server ..."; 
      msg(); 
      //clientSocket.Connect("127.0.0.1", 8888); 
      clientSocket.Connect(textIP.Text, Convert.ToInt32(textPort.Text)); 
      serverStream = clientSocket.GetStream(); 

      byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textName.Text + "$"); 
      serverStream.Write(outStream, 0, outStream.Length); 
      serverStream.Flush(); 

      Thread ctThread = new Thread(getMessage); 
      ctThread.Start(); 
     } 

     private void buttonSend_Click(object sender, EventArgs e) 
     { 
      // Show msg box if no server is connected 
      if (serverStream == null) 
      { 
       MessageBox.Show("Please connect to a server first!"); 
       return; 
      } 

      // Send text 
      byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textSend.Text + "$"); 
      serverStream.Write(outStream, 0, outStream.Length); 
      serverStream.Flush(); 

      // Clear text 
      textSend.Text = ""; 

     } 

     private void textDisplay_TextChanged(object sender, EventArgs e) 
     { 
      textDisplay.SelectionStart = textDisplay.Text.Length; 
      textDisplay.ScrollToCaret(); 
      textDisplay.Refresh(); 
     } 

     private void textSend_TextChanged(object sender, EventArgs e) 
     { 
      buttonSend.Enabled = !string.IsNullOrEmpty(textSend.Text); 
     } 
    } 
}

来源

2010-01-15 lewis

顺便说一句，只是发布所有的代码是不一样的解释。 – 2010-01-15 03:19:42

你的形式持有引用既TcpClient和NetworkStream实例。这两个实现IDisposable，所以他们必须明确处置。您必须重写表单的Dispose方法，如果这些实例不为null，则将其处置。

来源

2010-01-15 03:28:49

if(string.IsNullOrEmpty(textIP.Text) || string.IsNullOrEmpty(textPort.Text) || string.IsNullOrEmpty(textName.Text)) 
{ 
    MessageBox.Show("Please enter IP address, Port #, and Name"); 
} 
else 
{ 
    //they entered stuff...so, try to connect.. 
}

来源

2010-01-15 03:34:21

好的谢谢。如果我已经连接到服务器。那么我如何显示异常，说它已经连接 – lewis 2010-01-15 05:00:49

你真的应该试试看......如果你有麻烦，请发布解释你试过的东西，并寻求帮助。 – 2010-01-15 05:21:40

我以后需要它，你能再帮我一次吗？请：（ – lewis 2010-01-15 05:36:38

您可以使用TcpClient.Connected属性来检查连接是否已经建立。

 
if(clientSocket.Connected){ 
    .... show error message here 
} 
else{ 
    ... go ahead 
}

来源

2010-01-15 05:43:10 geekonweb

我如何结合我当前的代码，因为我已经实现了IF输入区域 – lewis 2010-01-15 06:15:20

如果我已经连接到服务器。那么我如何显示异常说它已经连接

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