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我正在使用 Xamarin.Forms 制作一个简单的 ProjectOxford Face and Emotion API 演示

我将来自 Nuget 的 Face 和 Emotion API 添加到 PCL Forms 项目和所有特定于平台的项目中，我得到一个 TypeLoadException 但 TypeName 属性为空，所以我不知道什么没有加载。

iOS 项目中的“链接行为”设置为“不链接”，应用程序在模拟器中运行，选择一张图片，但是当它遇到应该将其发送到面部和情感 API 的方法时，我得到下面的异常.

System.TypeLoadException: Failure has occurred while loading a type.
  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine] (TStateMachine& stateMachine) [0x00031] in /Library/Frameworks/Xamarin.iOS.framework/Versions/9.9.0.719/src/mono/external/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:316
  at HelloForms.FaceViewModel.DoAnalyzePhoto () [0x0000f] in <filename unknown>:0
  at HelloForms.FaceViewModel+<FaceViewModel>c__async8.MoveNext () [0x00021] in .../HelloForms/XPlat/HelloForms/ViewModels/FaceViewModel.cs:115
  at --- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/9.9.0.719/src/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>m__0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/9.9.0.719/src/mono/external/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1018
  at UIKit.UIKitSynchronizationContext+<Post>c__AnonStorey0.<>m__0 () [0x00000] in /Users/builder/data/lanes/1381/3afb4af5/source/maccore/src/UIKit/UIKitSynchronizationContext.cs:24
  at Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Users/builder/data/lanes/1381/3afb4af5/source/maccore/src/Foundation/NSAction.cs:163
  at at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/1381/3afb4af5/source/maccore/src/UIKit/UIApplication.cs:79
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/1381/3afb4af5/source/maccore/src/UIKit/UIApplication.cs:63
  at HelloForms.iOS.Application.Main (System.String[] args) [0x00008] in .../HelloForms/XPlat/iOS/Main.cs:17
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