Robert MacLean

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Here is an interesting issue, you need to implement a Share Source but to do the sharing you need it to be an async call. So what do you do? You can add the async & await modifiers but it won’t work correctly. The solution is to use the deferral which is given to you in the arguments of the event and when you are done you call the Complete method on it to indicate that you are done with all the async goodness:

async void App_DataRequested(DataTransferManager sender, DataRequestedEventArgs args)
{
    var deferral = args.Request.GetDeferral();

    // async code with await keyword here

    deferral.Complete();
}