Question

Could someone give me an example of how to use the ContactPicker.PickSingleContactAsync() functionality correctly in Windows 8 ASync programming, i’ve tried the following code below and I don’t seem to be able to retrieve the results, let alone proceed. the JavaScript example is a bit vague and I don’t understand JavaScript code. I’m new to ASync programming in C# as well

ContactPicker cp = new ContactPicker();
ContactInformation ci;
Task<ContactInformation> task = cp.PickSingleContactAsync() as Task<ContactInformation>;
await task;

How do I proceed to get results into ‘ci’ ? additionally, how do I ensure I get only contacts with phone numbers to pick from?

Answer 1

Try this:

ContactPicker cp = new ContactPicker();
ContactInformation ci = await cp.PickSingleContactAsync();

You can’t as-cast WinRT asynchronous method results to Task<T>, because they’re (probably) not Task<T>. Either await them directly (as above) or use the StartAsTask extension method:

ContactPicker cp = new ContactPicker();
Task<ContactInformation> ciTask = cp.PickSingleContactAsync().StartAsTask();
ContactInformation ci = await ciTask;