C# - UdpClient使用BeginReceive接收数据，但使用ReceiveAsync无法接收数据

以下是使用UdpClient的BeginReceive和Receive As ync方法接收数据的示例代码：

使用BeginReceive方法接收数据：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
public class UdpReceiveExample
    private static UdpClient udpClient;
    private static IPEndPoint ipEndPoint;
    private static bool isRunning;
    public static void Main()
        udpClient = new UdpClient(1234);
        ipEndPoint = new IPEndPoint(IPAddress.Any, 0);
        isRunning = true;
        udpClient.BeginReceive(ReceiveCallback, null);
        Console.WriteLine("Waiting for data...");
        while (isRunning)
            // Do other tasks while waiting for data
        udpClient.Close();
    private static void ReceiveCallback(IAsyncResult ar)
        byte[] receivedBytes = udpClient.EndReceive(ar, ref ipEndPoint);
        string receivedData = Encoding.ASCII.GetString(receivedBytes);
        Console.WriteLine("Received data: " + receivedData);
        // Continue listening for data
        udpClient.BeginReceive(ReceiveCallback, null);
使用ReceiveAsync方法接收数据：
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
public class UdpReceiveExample
    private static UdpClient udpClient;
    private static IPEndPoint ipEndPoint;
    private static bool isRunning;
    public static async Task Main()
        udpClient = new UdpClient(1234);
        ipEndPoint = new IPEndPoint(IPAddress.Any, 0);
        isRunning = true;
        Console.WriteLine("Waiting for data...");
        while (isRunning)
            UdpReceiveResult result = await udpClient.ReceiveAsync();
            byte[] receivedBytes = result.Buffer;
            string receivedData = Encoding.ASCII.GetString(receivedBytes);
            Console.WriteLine("Received data: " + receivedData);
        udpClient.Close();
请注意，使用ReceiveAsync方法时，Main方法必须声明为async，并且使用await关键字等待接收操作完成。在循环中接收数据时，不需要调用BeginReceive或EndReceive方法，因为ReceiveAsync方法会自动处理接收操作。