C# 多重异步方法调用期间的异常处理无效

我每秒生成100多条消息，并在单独的线程中发送这些消息。当连接断开时，我想捕获调用方中的异常。因为我所有的消息都是异步发送的，所以我无法捕获异常

下面是调用Dispatchermer_Tick方法的Dispatchermer代码

这是SendMessage代码。我根据以下内容进行了修改：，但它不起作用

private async static Task SendMessage(string message)
{
    try
    {
        (MQTT.RunAsync(message.ToString(), topic)).Wait();                
    }
    catch (Exception Ex)    
    {
        // Exceptions are not getting cought here
    }
}

MQTT.RunAsync的定义

及

---

事件处理程序是允许异步void的例外

private async void dispatcherTimer_Tick(object sender, EventArgs e) {
    try {
        item = "some generated message";
        await SendMessage(item);
    } catch (Exception ex) {
        //...handle exception
    }
}

此外，您似乎正在以任何方式使用异常，因为它已经被捕获到堆栈的更深处

尽量使代码始终保持异步，不要混合使用.Wait或.Result之类的阻塞调用

---

您是否尝试在MQTT.RunAsync中从RunAsync引发异常？是的，这会中断应用程序。我写了，抛出异常。我觉得AppDomain.UnhandledException事件是解决方案。看起来不错，但我的RunAsync并不简单。我现在对整个RunAsync方法提出了质疑。我无法在RunAsync内部使用return进行连接检查。即使连接检查也可能抛出异常，直到它不抛出异常！断然的。我们不应放置try-catch:并需要使用TaskScheduleRonUnobservedTaskeException处理程序：

public static async Task RunAsync(string message)
{
    var mqttClient = factory.CreateMqttClient()               
    try
    {
        await mqttClient.ConnectAsync(options);
    }
    catch (Exception exception)
    {

    }
}

Task<MqttClientConnectResult> ConnectAsync(IMqttClientOptions options)

 public Task RunAsync(string message, string topicName)
    {

            this.mqttClient.ConnectAsync(this.options);
            mqttClient.SubscribeAsync(new TopicFilterBuilder().WithTopic(this._topicname).WithExactlyOnceQoS().Build());
            var applicationMessage = new MqttApplicationMessageBuilder().WithTopic(this._topicname)
               .WithPayload(message).WithAtLeastOnceQoS().Build();

            if (stopSending == false)
            {
                return mqttClient.PublishAsync(applicationMessage);
            }
            return null;
    }

private async void dispatcherTimer_Tick(object sender, EventArgs e) {
    try {
        item = "some generated message";
        await SendMessage(item);
    } catch (Exception ex) {
        //...handle exception
    }
}

private static Task SendMessage(string message) {
    return MQTT.RunAsync(message, topic);
}

public static async Task RunAsync(string message, string topicName) {
    await this.mqttClient.ConnectAsync(this.options);
    var topicFilter = new TopicFilterBuilder().WithTopic(this._topicname)
        .WithExactlyOnceQoS().Build();
    await mqttClient.SubscribeAsync(topicFilter);
    var applicationMessage = new MqttApplicationMessageBuilder().WithTopic(this._topicname)
       .WithPayload(message).WithAtLeastOnceQoS().Build();

    if (stopSending == false) {
        await mqttClient.PublishAsync(applicationMessage);
    }

}