C#TCP/IP通讯简单例程，自动获取IP地址

【实例简介】

c#实现TCP/IP通讯，简单socket的应用，直接在VS2015运行

【实例截图】

服务器端：

客户端：

【核心代码】

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;

private void buttonStart_Click(object sender, System.EventArgs e)
{
IPAddress myIP;
IPEndPoint iep;
try
{
IPHostEntry myHost=new IPHostEntry();
myHost=Dns.GetHostByName(this.textBoxName.Text);
myIP=IPAddress.Parse(myHost.AddressList[0].ToString());
iep=new IPEndPoint(myIP,Int32.Parse(this.textBoxPort.Text));
}
catch
{
MessageBox.Show("你输入的服务器名或端口号格式不正确，请重新输入！");
return;
}
this.listBoxState.Items.Add("开始监听...");
this.buttonStart.Enabled=false;
serverSocket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
serverSocket.Bind(iep);
serverSocket.Listen(10);
serverSocket.BeginAccept(new AsyncCallback(AcceptConnection),serverSocket);
}

private void AcceptConnection(IAsyncResult ar)
{
Socket oldServer=(Socket)ar.AsyncState;
//异步接收传入的连接，并创建新的Socket来处理远程主机通信
clientSocket=oldServer.EndAccept(ar);;
            mess = "与客户" clientSocket.RemoteEndPoint.ToString() "建立连接。";
            salve_IP = clientSocket.RemoteEndPoint.ToString();
            dis_flat = 1;
            byte[] message=System.Text.Encoding.Unicode.GetBytes("客户你好！");
clientSocket.BeginSend(message,0,message.Length,SocketFlags.None,new AsyncCallback(SendData),clientSocket);
}


private void SendData(IAsyncResult ar)
{
Socket client=(Socket)ar.AsyncState;
try
{
clientSocket.EndSend(ar);
client.BeginReceive(data,0,dataSize,SocketFlags.None,new AsyncCallback(ReceiveData),client);
}
catch
{
                client.Close();
                mess = "客户" salve_IP "已关闭连接，等待新客户……";               
                dis_flat = 1;
                serverSocket.BeginAccept(new AsyncCallback(AcceptConnection),serverSocket);
}
}

private void ReceiveData(IAsyncResult ar)
{
Socket client=(Socket)ar.AsyncState;
try
{
//结束读取并获得读取的字节数
int receiveDataLength=client.EndReceive(ar);
string str=System.Text.Encoding.Unicode.GetString(data,0,receiveDataLength);           
                byte[] message=System.Text.Encoding.Unicode.GetBytes("应答：接收" str "成功");
clientSocket.BeginSend(message,0,message.Length,SocketFlags.None,new AsyncCallback(SendData),clientSocket);
                mess = "服务器收到信息：" str;
                dis_flat = 2;
            }
catch
{
                client.Close();
                mess = "客户已关闭连接，等待新客户……";
                dis_flat = 1;
                serverSocket.BeginAccept(new AsyncCallback(AcceptConnection),serverSocket);

}
}