无法在WPF应用程序中接收UDP数据包

using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows;

public partial class MainWindow : Window
{
    private UdpClient udpClient;

    public MainWindow()
    {
        InitializeComponent();
        StartListening();
    }

    private void StartListening()
    {
        udpClient = new UdpClient(1234); // 指定监听的本地端口号
        udpClient.BeginReceive(ReceiveCallback, null);
    }

    private void ReceiveCallback(IAsyncResult ar)
    {
        IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 1234);
        byte[] receivedBytes = udpClient.EndReceive(ar, ref endPoint);

        // 解析接收到的数据
        string receivedData = Encoding.UTF8.GetString(receivedBytes);

        // 在UI线程上更新UI界面
        Dispatcher.Invoke(() =>
        {
            // 更新UI元素的值
            receivedDataTextBox.Text = receivedData;
        });

        // 继续监听下一个数据包
        udpClient.BeginReceive(ReceiveCallback, null);
    }
}