在wpf中窗口关闭前强制发送MQTT消息？

using System.Windows;
using MqttNet;
using MqttNet.Client;
using MqttNet.Client.Connecting;
using MqttNet.Client.Disconnecting;
using MqttNet.Client.Options;

namespace WpfMqttExample
{
    public partial class MainWindow : Window
    {
        private IMqttClient mqttClient;

        public MainWindow()
        {
            InitializeComponent();

            // 初始化MQTT客户端
            mqttClient = new MqttFactory().CreateMqttClient();
            var options = new MqttClientOptionsBuilder()
                .WithTcpServer("broker.hivemq.com", 1883)
                .Build();

            mqttClient.ConnectAsync(options).Wait();

            // 订阅Closing事件
            this.Closing += MainWindow_Closing;
        }

        private void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            // 发送MQTT消息
            var message = new MqttApplicationMessageBuilder()
                .WithTopic("test/topic")
                .WithPayload("Window is closing")
                .Build();

            mqttClient.PublishAsync(message).Wait();

            // 断开MQTT连接
            mqttClient.DisconnectAsync().Wait();
        }
    }
}

Application.Current.Dispatcher.Invoke(() =>
{
    // 在UI线程中执行操作
});