C#中使用UDP通信

UDP通信是无连接通信，客户端在发送数据前无需与服务器端建立连接，即使服务器端不在线也可以发送，但是不能保证服务器端可以收到数据。

服务器端代码：

C#代码



static void Main(string[] args)

{

UdpClient client = null;

string receiveString = null;

byte[] receiveData = null;

//实例化一个远程端点，IP和端口可以随意指定，等调用client.Receive(ref remotePoint)时会将该端点改成真正发送端端点

IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 0);

while (true)

{

client = new UdpClient(11000);

receiveData = client.Receive(ref remotePoint);//接收数据

receiveString = Encoding.Default.GetString(receiveData);

Console.WriteLine(receiveString);

client.Close();//关闭连接

}

}

客户端代码：

C#代码



static void Main(string[] args)

{

string sendString = null;//要发送的字符串

byte[] sendData = null;//要发送的字节数组

UdpClient client = null;

IPAddress remoteIP = IPAddress.Parse("127.0.0.1");

int remotePort = 11000;

IPEndPoint remotePoint = new IPEndPoint(remoteIP, remotePort);//实例化一个远程端点

while (true)

{

sendString = Console.ReadLine();

sendData = Encoding.Default.GetBytes(sendString);

client = new UdpClient();

client.Send(sendData, sendData.Length, remotePoint);//将数据发送到远程端点

client.Close();//关闭连接

}

}