Question

我对IMvxMessenger的这种行为感到困惑。

我在viewmodel的构造函数中看到了这样的订阅：

_updateToken = _messenger.SubscribeOnThreadPoolThread<PushNotificationReceivedMessage>(async (message) =>
        {
            await Reload();
        }, MvxReference.Weak);

MvxMessage PushNotificationReceivedMessage发布在一个与firebase事件相关的位置：

[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]    
public class PulseFirebaseMessagingService : FirebaseMessagingService
{
    const string TAG = "PulseFirebaseMessagingService";
    public override void OnMessageReceived(RemoteMessage remoteMessage)
    {
        Mvx.Resolve<IMvxMessenger>().Publish(new PushNotificationReceivedMessage(this));
    }
}

我能够看到消息发布一次，但是多次调用了订阅。这是一个调用堆栈，显示了这种情况：

>   0xE in Core.ViewModels.MainViewModel.Reload at Core\ViewModels\MainViewModel.cs:157,9   C#
0x38 in System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<Core.ViewModels.MainViewModel.<Reload>d__38> at /Users/builder/data/lanes/4468/f913a78a/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:316,17    C#
0x2A in Core.ViewModels.MainViewModel.Reload    C#
0x15 in Core.ViewModels.MainViewModel.<-ctor<-ctor>b__37_0>d at Core\ViewModels\MainViewModel.cs:140,17 C#
0x38 in System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start<Core.ViewModels.MainViewModel.<<-ctor>b__37_0>d> at /Users/builder/data/lanes/4468/f913a78a/source/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:84,17 C#
0x31 in Core.ViewModels.MainViewModel.<.ctor>b__37_0    C#
0x11 in MvvmCross.Plugins.Messenger.Subscriptions.WeakSubscription<Core.Messages.PushNotificationReceivedMessage>.  C#

任何人都可以对此有所了解吗？

谢谢

MvvmCross IMvxMessenger订阅一次发布一次发布

0 个答案: