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SocketUDP

自己即是服务器又是客户端 ，在发消息只需要改成对方ip和端口号即可

前提对方必须开启服务器 socket.Bind(new IPEndPoint(IPAddress.Parse("192.168.107.72"), 8080));

控件：Button,TextBox,RichTextBox

打开自己服务器

public Form1()
{InitializeComponent();//1创建一个服务器 绑定的是ip和端口号 192.168.107.83, 8080// 张三的终端 以后谁想跟张三聊的时候 发这个ip和端口号socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);socket.Bind(new IPEndPoint(IPAddress.Any, 8080));startReceive();
}
Socket socket;
void startReceive() 
{byte[] bs = new byte[1024];Task.Run(() =>{while (true){int count = socket.Receive(bs);string s = Encoding.UTF8.GetString(bs,0, count);this.Invoke((Action)(() =>{richTextBox1.AppendText(s + "\t\n");}));}});
}

发送按钮事件

private void button1_Click(object sender, EventArgs e)
{//发消息的一定要注意iphe端口号socket.SendTo(Encoding.UTF8.GetBytes(this.textBox1.Text),new IPEndPoint(IPAddress.Parse("192.168.107.73"), 8082));
}

Socket组播服务器

组播需要使用组播地址，在 IPv4 中它的范围从 224.0.0.0 到 239.255.255.255，

并被划分为局部链接多播地址、预留多播地址和管理权限多播地址三类

224.0.0.0 ~ 224.0.0.255: 局部链接多播地址：是为路由协议和其它用途保留的地址，  

只能用于局域网中，路由器是不会转发的地址 224.0.0.0 不能用，是保留地址  

224.0.1.0 ~ 224.0.1.255: 为用户可用的组播地址（临时组地址），可以用于 Internet 上的。

224.0.2.0 ~ 238.255.255.255: 用户可用的组播地址（临时组地址），全网范围内有效  

239.0.0.0 ~ 239.255.255.255: 为本地管理组播地址，仅在特定的本地范围内有效

 public Form1(){InitializeComponent();}Socket socket;private void button1_Click(object sender, EventArgs e){//1创建socket对象socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//2 绑定ip和端口号socket.Bind(new IPEndPoint(IPAddress.Parse("192.168.107.83"), 8080));//3 加入组播地址//SetSocketOption 添加套接字可配置选项//参数1.支持协议类型，//参数2 添加组播地址的功能//参数3 要组播的地址socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership,new MulticastOption(IPAddress.Parse("224.0.0.188")));//4以后大家要是接受的话 接受组内发来的消息的时候 必须添接受组内代码//5 接收数据startReceive();     
}
void startReceive()
{new Thread(() =>{byte[] buffer = new byte[1024];while (true){int count = socket.Receive(buffer);string s = Encoding.UTF8.GetString(buffer, 0, count);richTextBox1.Invoke((Action)(() =>{richTextBox1.AppendText(s + "\t\n");}));}}).Start();
}//发送消息
private void button2_Click(object sender, EventArgs e)
{//发消息指定组地址进行发送,以后要求接受消息端口号和此处端口号保持一致socket.SendTo(Encoding.UTF8.GetBytes(this.textBox1.Text),new IPEndPoint(IPAddress.Parse("224.0.0.188"), 10086));
}

socket组播客户端

控件:

两个按钮（客户端打开接收消息，发送），textbox,richtextBox

        public Form1(){InitializeComponent();}Socket socket;private void button1_Click(object sender, EventArgs e){//1创建socket对象socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//2 绑定ip和端口号socket.Bind(new IPEndPoint(IPAddress.Any, 10086));//3 设置组地址 对客户端加入指定组播地址内socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership,new MulticastOption(IPAddress.Parse("224.0.1.188")));//4 接受消息Task.Run(() =>{while (true){byte[] buffer = new byte[1024];//int count = socket.Receive(buffer);EndPoint ip = new IPEndPoint(IPAddress.None, 0); //定义endpoint类型变量，终端类型//ReceiveFrom()接受数据的方法 从哪个终端发来的消息//参数3是发来消息的地址 类型是endpointint count = socket.ReceiveFrom(buffer, 0, ref ip);IPEndPoint i1 = ip as IPEndPoint; // 把endpoint类型 转成IPEndPointstring s = Encoding.UTF8.GetString(buffer, 0, count);richTextBox1.Invoke((Action)(() =>{richTextBox1.AppendText(i1.Address+":"+s + "\t\n");richTextBox1.SelectionStart=richTextBox1.Text.Length; richTextBox1.ScrollToCaret();}));}});}private void button2_Click(object sender, EventArgs e){//socket.SendTo(Encoding.UTF8.GetBytes("hello world"),//    new IPEndPoint(IPAddress.Parse("192.168.107.83"), 8080));if (Encoding.UTF8.GetBytes(this.textBox1.Text).Length>1024){return;}socket.SendTo(Encoding.UTF8.GetBytes(this.textBox1.Text),new IPEndPoint(IPAddress.Parse("224.0.1.188"), 10086));}