UWP后台任务未执行

Question

I am new to uwp and I am trying to learn how to make a background task. I tried to follow the instruction I have found online but cannot seem to get it working. I am not getting an explicit error but my background task is not writing to the debug console. Any help would greatly be appreciated.

This is my main xaml

This is my mainpage class

This is my Background Task in the Windows Runtime Component Project("MyBackgroundTask")

This is my manifest

This is before I press the button

This is after I press the button

Answer 1

Currently, you are using ApplicationTrigger for your BackgroundTask. This will allow you to start executing your backgroundtask programmatically.

But you need to call ApplicationTrigger.RequestAsync or ApplicationTrigger.RequestAsync(ValueSet) to start invoking your background task.

So, store your trigger globally, and call trigger.RequestAsync after registration(eg in another button click event handler) will solve the problem:

ApplicationTrigger trigger;
...
private async void btnTrigger_Click(object sender, RoutedEventArgs e)
{
    await trigger.RequestAsync();
}