NullReferenceException在Xamarin.IOS中使用Office365API时

Question

首先，我有一个问题：Using Office 365 API in Xamarin.Android

现在，在Xamarin IOS中进行同样的测试，我得到了另一个:(

{System.NullReferenceException: Object reference not set to an instance of an object
  at Microsoft.Office365.OAuth.Authenticator.GetRefreshToken (System.String resource) [0x00000] in <filename unknown>:0 
  at Microsoft.Office365.OAuth.Authenticator+<GetAuthenticationResult>d__c.MoveNext () [0x00000] in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000b] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System.Runtime.ExceptionServices/ExceptionDispatchInfo.cs:62 
  at System.Runtime.CompilerServices.TaskAwaiter`1[Microsoft.Office365.OAuth.AuthenticationInfo].GetResult () [0x00034] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System.Runtime.CompilerServices/TaskAwaiter_T.cs:59 
  at Microsoft.Office365.OAuth.Authenticator+<AuthenticateAsync>d__6.MoveNext () [0x00000] in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000b] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System.Runtime.ExceptionServices/ExceptionDispatchInfo.cs:62 
  at System.Runtime.CompilerServices.TaskAwaiter`1[Microsoft.Office365.OAuth.AuthenticationInfo].GetResult () [0x00034] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System.Runtime.CompilerServices/TaskAwaiter_T.cs:59 
  at Office365InXamarinApps.ViewModel.ContactsViewModel+<EnsureClientCreated>d__9.MoveNext () [0x00046] in c:\DevApps\GitHub\Office365InXamarinApps\scr\Office365InXamarinApps\Office365InXamarinApps\ViewModel\ContactsViewModel.cs:76 }

代码在这里：https://github.com/saramgsilva/Office365InXamarinApp

Answer 1

Office 365 API预览有问题，我不能使用它，因此我使用Office365RESTAPI创建了另一个演示。

https://github.com/saramgsilva/Office365RESTAPISample

Answer 2

您可能需要查看这篇博客文章(参见Xamarin论坛中的链接)，-Xamarin开发人员能够让它在Android上工作

http://forums.xamarin.com/discussion/21367/put-some-office-365-in-your-apps