C# UDP接收字符串

在C#中，要通过UDP（用户数据报协议）接收字符串，你需要创建一个UdpClient实例，并监听指定端口。这里是一个简单的示例，展示了如何在接收到数据后将其解析为字符串：

using System.Net;
using System.Net.Sockets;

public class UdpStringReceiver
{
    private UdpClient udpClient;
    public event EventHandler<UdpReceiveEventArgs> DataReceived;

    public UdpStringReceiver(int port)
    {
        udpClient = new UdpClient(port);
        udpClient.DataReceived += OnDataReceived;
    }

    private void OnDataReceived(object sender, UdpReceiveEventArgs e)
    {
        byte[] data = e.Buffer;
        string receivedString = Encoding.UTF8.GetString(data, 0, data.Length); // 假设数据是以UTF8编码的
        if (receivedString != null)
        {
            DataReceived?.Invoke(this, new UdpReceiveEventArgs(receivedString));
        }
    }

    public async Task StartListening()
    {
        await udpClient.ReceiveAsync();
    }

    public void StopListening()
    {
        udpClient.Close();
    }
}

// 使用示例
public static void Main(string[] args)
{
    UdpStringReceiver receiver = new UdpStringReceiver(12345);
    receiver.DataReceived += (_, e) => Console.WriteLine($"Received string: {e.ReceivedString}");
    receiver.StartListening(); // 开始监听
}

在这个例子中，我们创建了一个事件处理器`OnDataReceived`，当接收到新的数据时，会从缓冲区解码为字符串并触发`DataReceived`事件。