"LinkAssemblies“任务意外失败。Xamarin.Forms 3.4.0.1009999更新

Question

在更新到Xamarin.Forms 3.4.0.1009999之后，在尝试以发布模式- The "LinkAssemblies" Task Failed Unexpectedly运行应用程序时会出现以下错误

我已经搜索了这个错误，并在这个问题上看到了多个线程，但是它们都是xamarin的早期版本，而不是建议的解决方案。

不过，我试过的是：

• 清除bin和obj文件夹，然后重新生成解决方案。
• 改变linker behaviour (关闭它)，这实际上是可行的，但一个巨大的应用程序不是一个选项。
• 尝试过清洁和建筑，而不是重建，这在本质上是一样的事情，这是值得一试，虽然，它是对其他人以前的工作。
• 从Xamarin.Forms项目中删除和重新添加Xamarin.Android包 日志：

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(5,5): Error MSB4018: The "LinkAssemblies" task failed unexpectedly.
Mono.Linker.MarkException: Error processing method: 'Android.Views.ScaleGestureDetector Xamarin.Forms.Platform.Android.GestureManager::InitializeScaleDetector()' in assembly: 'Xamarin.Forms.Platform.Android.dll' ---> Mono.Cecil.ResolutionException: Failed to resolve System.Void Android.Support.V4.View.ScaleGestureDetectorCompat::SetQuickScaleEnabled(Android.Views.ScaleGestureDetector,System.Boolean)
  at Mono.Linker.Steps.MarkStep.HandleUnresolvedMethod (Mono.Cecil.MethodReference reference) [0x00013] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.MarkMethod (Mono.Cecil.MethodReference reference) [0x0004a] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.MarkInstruction (Mono.Cecil.Cil.Instruction instruction) [0x00040] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.MarkMethodBody (Mono.Cecil.Cil.MethodBody body) [0x00098] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.ProcessMethod (Mono.Cecil.MethodDefinition method) [0x00162] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.ProcessQueue () [0x0001b] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
   --- End of inner exception stack trace ---
  at Mono.Linker.Steps.MarkStep.ProcessQueue () [0x00047] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue () [0x0000a] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.Process () [0x00102] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Steps.MarkStep.Process (Mono.Linker.LinkContext context) [0x0000d] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at MonoDroid.Tuner.MonoDroidMarkStep.Process (Mono.Linker.LinkContext context) [0x0000b] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Mono.Linker.Pipeline.Process (Mono.Linker.LinkContext context) [0x0001c] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at MonoDroid.Tuner.Linker.Run (Mono.Linker.Pipeline pipeline, Mono.Linker.LinkContext context) [0x00000] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at MonoDroid.Tuner.Linker.Process (MonoDroid.Tuner.LinkerOptions options, Mono.Linker.ILogger logger, Mono.Linker.LinkContext& context) [0x00071] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Xamarin.Android.Tasks.LinkAssemblies.Execute (Java.Interop.Tools.Cecil.DirectoryAssemblyResolver res) [0x002d4] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Xamarin.Android.Tasks.LinkAssemblies.Execute () [0x0021f] in <947dd92f52fa43c1922f96c7b9774bdc>:0 
  at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-06/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:573 
  at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) [0x001f6] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-06/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:784  (MSB4018) (LoyaltyWorx.Android)

我期望该项目能像以前版本的Xamarin.Forms那样在设备上运行，而不必改变链接器的行为，并显着地增加应用程序的大小。

Answer 1

将Xamarin.Android.Support库更新为v27。这通常解决了这个问题。不要忘记清理和构建，可能会重新启动Visual

Answer 2

对我来说，这个问题并没有像上面那样得到解决。解决方案是根据下面的文章：https://forums.xamarin.com/discussion/146012/error-during-release-build设置到None的链接