call async methods in synchronized method in windows phone 8

Question

is this a better way to call a async method in a synchronised method.

public bool Sync() 
{ 
  return Task.Run(() => MyClass.IsSyncDone()).Result; 
}

will it cause deadlocks? I really need to know a better way. because I do not want to make async to system calls i.e. App launching, registered methods etc. can anyone please help.

MyClass.IsSyncDone() is an Async function. will create warning to have async caller. — Priti, Nov 06 '13 at 12:12
I have 3-4 methods which need to be called at App launch event. and making async to private void Application_Launching(object sender, LaunchingEventArgs e) is creating deadlocks and methods are not responding. I need a correct and better way. — Priti, Nov 06 '13 at 12:14
Yes. It calls few async, DB calls and webservice calls and do synchronization and returns Task. — Priti, Nov 06 '13 at 12:16

score 2 · Accepted Answer · answered Nov 06 '13 at 13:30

If you didn't need the responses then you could easily do something like this:

public bool Sync() 
{ 
    Task.Run(async () => await MyClass.DoSync());
}

That you need the response will mean more complicated code. Without seeing the full code it's hard to provide specific examples but it's generally better to not tie such long running, complicated asynchronous operations to synchronous ones.
Either pass a continuation to the async method to create via a task or have the async method update a bound property of a viewmodel when finished or fire a custom event.

It is important not to perform any potentially long running async operations in the application livecycle event handlers as if these take to long it can lead to the application being forcefully terminated or the app data being left in an inconsistent state.

At some places its showing warning that await operator required. Can you please suggest something. — Priti, Nov 11 '13 at 12:22
@pri I suggest adding the await operators where they're required. Without seeing the code there's little else to suggest. — Matt Lacey, Nov 11 '13 at 20:21

call async methods in synchronized method in windows phone 8

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