WP8 KnownContactProperties.Birthdate無法設置值

Question

var store = await ContactStore.CreateOrOpenAsync();
StoredContact sc = new StoredContact(store);
IDictionary<string, object> values = await sc.GetPropertiesAsync();
values[KnownContactProperties.FamilyName] =  "bbb";
values[KnownContactProperties.GivenName]=  "worerrrrld";

//*************problem here**************
Nullable<DateTime> birth = DateTime.Now;
values[KnownContactProperties.Birthdate] = birth;
//values[KnownContactProperties.Birthdate] = DateTime.Now;
//values[KnownContactProperties.Birthdate] = "2010-05-10";
//it will cause exception by any way above.
//***************************************

await sc.SaveAsync();//Exception throw here  :System.InvalidCastException

關於Windows Phone8 API

Windows.Phone.PersonalInformation命名空間

關於Class StoredContact太奇怪了！

有誰能夠幫助我！ 如何設置此KnownContactProperties.Birthdate ？

Answer 1

InvalidCastException是正常的，因為期望的對象是DateTimeOffset。

嘗試這個：

values[KnownContactProperties.Birthdate] = new DateTimeOffset(DateTime.Parse("2010-05-10"));

問候。