Используя пример из MSDN , вы можете сделать что-то вроде этого:
private void Button_Click(object sender, RoutedEventArgs e)
{
Contacts cons = new Contacts();
//Identify the method that runs after the asynchronous search completes.
cons.SearchCompleted += new EventHandler<ContactsSearchEventArgs>(Contacts_SearchCompleted);
//Start the asynchronous search.
cons.SearchAsync(String.Empty, FilterKind.None, "Contacts Test #1");
}
void Contacts_SearchCompleted(object sender, ContactsSearchEventArgs e)
{
var myMobilePhoneContacts = new List<Contact>();
foreach (var contact in e.Results)
{
myMobilePhoneContacts.AddRange((from phoneNumber in contact.PhoneNumbers
where phoneNumber.Kind == PhoneNumberKind.Mobile
select contact).Select(cont => (Contact)cont));
}
// do something with the contacts in myMobilePhoneContacts
}