await in override void loadstate problem

Question

Hi,

I need to Deserialize (using await) some application settings in the override method LoadState of a Metro App: 

protected override void LoadState(...)

The method is not awaitable because it returns void. I cant' control loading of data.  

With the use of a semaphore I have find a solution that seems work to me:

protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
    LoadStateAsync();           // this continues execution without wait
}
private async Task LoadStateAsync()
{
    app.PlaySemaphore.WaitOne();   // semaphore defined in App class (here app)
    StorageFile file = null;
    file = await   ApplicationData.Current.LocalFolder.GetFileAsync  (App.FILENAME_SETTINGS);
    app.PlaySettings = await Settings.LoadAsync(file);   // an async method for Deserialize
    app.PlaySemaphore.Release();
}
...... far away in code
    app.PlaySemaphore.WaitOne();
    app.PlaySemaphore.Release();
...... continue with execution using app.PlaySettings

...)

Someone have just try it ? Have you find contraindications ?

Answer 1

I have tried the code in a similar context. It code does not work. (It blocks UI thread)