Xamarin.android 在Android中使用mvvmcross调用Windows Azure移动服务的ToListSync（）方法时出错

我正在用mvvmcross中的AzureMobile服务构建一个应用程序，当我调用ToListSync（）方法从Windows Phone 8中的服务器检索数据时，它工作正常，但Xamarin.Android中有一个错误。有人建议我解决这个问题吗

这是一个完整的错误堆栈

mvx:Warning: 39.64 Exception masked AggregateException: 
12-02 14:06:53.317 I/mono-stdout( 2032): mvx:Warning: 39.64 Exception masked AggregateException: 
      at System.Threading.Tasks.Task`1[System.Collections.Generic.List`1[EmployeeDirectoryCross.Core.Models.Employee]].get_Result () [0x00000] in <filename unknown>:0 
12-02 14:06:53.326 I/mono-stdout( 2032):      at System.Threading.Tasks.Task`1[System.Collections.Generic.List`1[EmployeeDirectoryCross.Core.Models.Employee]].get_Result () [0x00000] in <filename unknown>:0 
12-02 14:06:53.335 I/mono-stdout( 2032):   at EmployeeDirectoryCross.Core.ViewModels.EmployeeListViewModel+<>c__DisplayClass2.<SearchEmployees>b__1 () [0x00001] in e:\Study\Xamarin\XamrinSamples\EmployeeDirectoryCross\EmployeeDirectoryCross.Core\ViewModels\EmployeeListViewModel.cs:54 
12-02 14:06:53.335 D/Mono    ( 2032): Unloading image System.dll [0x2b365118].
12-02 14:06:53.335 D/Mono    ( 2032): Image addref System[0x2b354bf8] -> System.dll[0x2a6189d8]: 18
  at EmployeeDirectoryCross.Core.ViewModels.EmployeeListViewModel+<>c__DisplayClass2.<SearchEmployees>b__1 () [0x00001] in e:\Study\Xamarin\XamrinSamples\EmployeeDirectoryCross\EmployeeDirectoryCross.Core\ViewModels\EmployeeListViewModel.cs:54 
12-02 14:06:53.355 I/mono-stdout( 2032):   at Cirrious.CrossCore.Core.MvxMainThreadDispatcher.ExceptionMaskedAction (System.Action action) [0x00000] in <filename unknown>:0 

  at Cirrious.CrossCore.Core.MvxMainThreadDispatcher.ExceptionMaskedAction (System.Action action) [0x00000] in <filename unknown>:0 
12-02 14:06:53.355 I/mono-stdout( 2032): InnerException was MobileServiceInvalidOperationException: The server did not provide a response with the expected content.
InnerException was MobileServiceInvalidOperationException: The server did not provide a response with the expected content.
      at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+<SendRequestAsync>d__1c.MoveNext () [0x00000] in <filename unknown>:0 
12-02 14:06:53.355 I/mono-stdout( 2032):      at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+<SendRequestAsync>d__1c.MoveNext () [0x00000] in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
12-02 14:06:53.355 I/mono-stdout( 2032): --- End of stack trace from previous location where exception was thrown ---

  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
12-02 14:06:53.365 I/mono-stdout( 2032):   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0 
12-02 14:06:53.365 I/mono-stdout( 2032):   at System.Runtime.CompilerServices.TaskAwaiter`1[System.Net.Http.HttpResponseMessage].GetResult () [0x00000] in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter`1[System.Net.Http.HttpResponseMessage].GetResult () [0x00000] in <filename unknown>:0 
12-02 14:06:53.385 I/mono-stdout( 2032):   at Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+<RequestAsync>d__4.MoveNext () [0x00000] in <filename unknown>:0 

mvx:警告：39.64异常屏蔽聚合异常：
12-02 14:06:53.317 I/mono标准输出（2032）：mvx:警告：39.64异常屏蔽聚合异常：
在System.Threading.Tasks.Task`1[System.Collections.Generic.List`1[EmployeeDirectoryCross.Core.Models.Employee]]处。在以下位置获取结果（）[0x00000]：0
12-02 14:06:53.326 I/mono标准输出（2032）：在System.Threading.Tasks.Task`1[System.Collections.Generic.List`1[EmployeeDirectoryCross.Core.Models.Employee]]中。在：0中获取结果（）[0x00000]
12-02 14:06:53.335 I/mono标准输出（2032）：在EmployeeDirectoryCross.Core.ViewModels.EmployeeListViewModel+c_u显示Class2.b_uu1（）[0x00001]在e:\Study\Xamarin\XamrinSamples\EmployeeDirectoryCross\EmployeeDirectoryCross.Core\ViewModels\EmployeeListViewModels.cs:54
12-02 14:06:53.335 D/Mono（2032）：正在卸载image System.dll[0x2b365118]。
12-02 14:06:53.335 D/Mono（2032）：图像添加参考系统[0x2b354bf8]->System.dll[0x2a6189d8]：18
在EmployeeDirectoryCross.Core.ViewModels.EmployeeListViewModel+c__显示Class2.b_uu 1（）[0x00001]，在e:\Study\Xamarin\XamrinSamples\EmployeeDirectoryCross\EmployeeDirectoryCross.Core\ViewModels\EmployeeListViewModel\EmployeeListViewModel.cs:54中
12-02 14:06:53.355 I/mono标准输出（2032）：在cirrium.CrossCore.Core.MvxMainThreadDispatcher.ExceptionMaskedAction（System.Action动作）[0x00000]in:0
在cirrium.CrossCore.Core.MvxMainThreadDispatcher.ExceptionMaskedAction（System.Action动作）[0x00000]中：0
12-02 14:06:53.355 I/mono标准输出（2032）：InnerException为MobileServiceInvalidOperationException:服务器未提供具有预期内容的响应。
InnerException为MobileServiceInvalidOperationException:服务器未提供具有预期内容的响应。
在Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+d_u1C.MoveNext（）[0x00000]中：0
12-02 14:06:53.355 I/mono标准输出（2032）：位于Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+d_u1C.MoveNext（）[0x00000]in:0
---来自引发异常的上一个位置的堆栈结束跟踪---
12-02 14:06:53.355 I/mono标准输出（2032）：--来自引发异常的前一个位置的堆栈结束跟踪---
0中的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）[0x00000]处
12-02 14:06:53.365 I/mono标准输出（2032）：位于System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）[0x00000]中：0
12-02 14:06:53.365 I/mono标准输出（2032）：在System.Runtime.CompilerServices.TaskAwaiter`1[System.Net.Http.HttpResponseMessage].GetResult（）[0x00000]中：0
在System.Runtime.CompilerServices.TaskAwaiter`1[System.Net.Http.HttpResponseMessage].GetResult（）[0x00000]中：0
12-02 14:06:53.385 I/mono标准输出（2032）：在Microsoft.WindowsAzure.MobileServices.MobileServiceHttpClient+d_u4.MoveNext（）[0x00000]中：0

我将MvvmCross/MobileServiceAzure与Android一起使用，并将WindowsPhone与ToListSync（）一起使用。它很好用。您是否有示例代码或演示项目？“服务器未提供具有预期内容的响应”表明从服务器返回的json响应为空-。某种类型的示例代码可能有助于调试此代码