任务。运行引发事件的方法

Question

In a Windows Store application, written in WPF and C#, I need to launch an async method who gather informations from files. But I want it to run in background while to UI is responsive to user interactions. So, I did this :

Task x = Task.Run(async () => await Method());

The problem is, "Method" must raise change notifications to the UI. As you can expect, it crashed because the method who raise the event is not in the UI thread.

So, I did this :

TaskScheduler t = TaskScheduler.FromCurrentSynchronisationContext();
Task x = Task.Run(() => {}).ContinueWith(async _ => await Method(), t);

My question is, as I must specify a synchronization context, and as there is no way to specify it in the Run method, is there a way to do something like this :

TaskScheduler t = TaskScheduler.FromCurrentSynchronisationContext();
Task x = Task.ContinueWith(async _ => await Method(), t);

Or, if you have another suggestion to make it work, it is welcome.

Thank you.

Answer 1

You dont need to spin up a new Task at all. You can simply await Method() without needing to use ContinueWith on Task which consumes a ThreadPool thrrad.. When you await on an async method, it will run synchronously until hitting the first await and return back to the calling method, which will keep your UI responsive

You can simply

await Method();