使用C#实现基于TCP和UDP协议的网络通信程序的基本示例

C#中使用TCP通信

TCP通信需要通信双方都在线,所以需要先启动服务端进行监听,客户端才能获得连接,服务端代码:

static void Main(string[] args)

{

TcpClient client = null;

NetworkStream stream = null;

byte[] buffer = null;

string receiveString = null;

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

int localPort = 11000;

TcpListener listener = new TcpListener(localIP, localPort);//用本地IP和端口实例化Listener

listener.Start();//开始监听

while (true)

{

client = listener.AcceptTcpClient();//接受一个Client

buffer = new byte[client.ReceiveBufferSize];

stream = client.GetStream();//获取网络流

stream.Read(buffer, 0, buffer.Length);//读取网络流中的数据

stream.Close();//关闭流

client.Close();//关闭Client

receiveString = Encoding.Default.GetString(buffer).Trim('\0');//转换成字符串

Console.WriteLine(receiveString);

}

}

只有服务端开启监听后,客户端才能正确连接,所以服务端要一直开启监听,客户端每次发送数据,都要首先与服务端建立连接,连接建立完成后才进行数据发送。客户端代码:

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

TcpClient client = null;//TcpClient实例

NetworkStream stream = null;//网络流

IPAddress remoteIP = IPAddress.Parse("127.0.0.1");//远程主机IP

int remotePort = 11000;//远程主机端口

while (true)//死循环

{

sendString = Console.ReadLine();//获取要发送的字符串

sendData = Encoding.Default.GetBytes(sendString);//获取要发送的字节数组

client = new TcpClient();//实例化TcpClient

try

{

client.Connect(remoteIP, remotePort);//连接远程主机

}

catch (System.Exception ex)

{

Console.WriteLine("连接超时,服务器没有响应!");//连接失败

Console.ReadKey();

return;

}

stream = client.GetStream();//获取网络流

stream.Write(sendData, 0, sendData.Length);//将数据写入网络流

stream.Close();//关闭网络流

client.Close();//关闭客户端

}

}

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:

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:

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

}

}

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