归档 Xamarin.Forms Android 应用程序时出错 - “LinkAssemblies”任务意外失败

Question

我有一个相对简单的 Xamarin.Forms 应用程序，它使用 Realm.io 进行持久性。我可以在发布和调试配置中构建应用程序。但是，当我尝试归档应用程序以分发它时，包创建失败并出现以下错误：

System.ArgumentException: An item with the same key has already been added. Key: ProcessedByFody
  at System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x0015a] in <b814b509d4ad406fb40c6c93e38929e7>:0 
  at System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in <b814b509d4ad406fb40c6c93e38929e7>:0 
  at System.Linq.Enumerable.ToDictionary[TSource,TKey] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] keySelector, System.Collections.Generic.IEqualityComparer`1[T] comparer) [0x0007d] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-06/external/bockbuild/builds/mono-x64/external/corefx/src/System.Linq/src/System/Linq/ToCollection.cs:71 
  at System.Linq.Enumerable.ToDictionary[TSource,TKey] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] keySelector) [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-06/external/bockbuild/builds/mono-x64/external/corefx/src/System.Linq/src/System/Linq/ToCollection.cs:34 
  at MonoDroid.Tuner.MarkJavaObjects.GetTypesInModule (Mono.Cecil.ModuleDefinition module) [0x00006] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.MarkJavaObjects.FindType (Mono.Cecil.TypeDefinition type, System.String fullname) [0x0001b] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.MarkJavaObjects.GetHelperType (Mono.Cecil.TypeDefinition type, System.String suffix) [0x00042] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.MarkJavaObjects.PreserveHelperType (Mono.Cecil.TypeDefinition type, System.String suffix) [0x00000] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.MarkJavaObjects.PreserveAdapter (Mono.Cecil.TypeDefinition type) [0x00000] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.MarkJavaObjects.PreserveJavaObjectImplementation (Mono.Cecil.TypeDefinition type) [0x0000e] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.MarkJavaObjects.ProcessType (Mono.Cecil.TypeDefinition type) [0x00009] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Mono.Tuner.SubStepDispatcher.DispatchType (Mono.Cecil.TypeDefinition type) [0x0002d] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Mono.Tuner.SubStepDispatcher.BrowseTypes (System.Collections.ICollection types) [0x00018] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Mono.Tuner.SubStepDispatcher.BrowseAssemblies (System.Collections.Generic.IEnumerable`1[T] assemblies) [0x0003f] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Mono.Tuner.SubStepDispatcher.Process (Mono.Linker.LinkContext context) [0x0000e] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Mono.Linker.Pipeline.ProcessStep (Mono.Linker.LinkContext context, Mono.Linker.Steps.IStep step) [0x0000d] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Mono.Linker.Pipeline.Process (Mono.Linker.LinkContext context) [0x0000f] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.Linker.Run (Mono.Linker.Pipeline pipeline, Mono.Linker.LinkContext context) [0x00000] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at MonoDroid.Tuner.Linker.Process (MonoDroid.Tuner.LinkerOptions options, Mono.Linker.ILogger logger, Mono.Linker.LinkContext& context) [0x00071] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Xamarin.Android.Tasks.LinkAssemblies.Execute (Java.Interop.Tools.Cecil.DirectoryAssemblyResolver res) [0x002d4] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Xamarin.Android.Tasks.LinkAssemblies.Execute () [0x0001b] in <fa231dc8d40d45fd86217b6055f9a563>:0 
  at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-06/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:574 
  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) [0x002a9] in /Users/builder/jenkins/workspace/build-package-osx-mono/2019-06/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:805 
Done building target "_LinkAssembliesShrink" in project "MyProject.Android.csproj" -- FAILED.

我正在使用 Visual Studio for Mac Enterprise 版本 8.3.1（内部版本 18）

我的应用正在使用以下 Nuget 包：

• Newtonsoft.Json 12.0.2
• 领域 4.1.0
• Xamarin.Android.Support.Core.Utils 28.0.0.3
• Xamarin.Essentials 1.3.1
• Xamarin.Forms 4.2.0.848062

在将 Realm 添加到项目之前，我能够存档应用程序。有没有人遇到过并（希望）解决了 Realm/Fody/Xamarin 的类似问题？

注意：我可以通过将 Realm 降级到 3.4.0 来解决这个问题

Answer 1

您可以尝试以下方法：

1.方法一

转到 VS 菜单 Tools > Options > Xamarin > Archives Location

如果路径不以\ 结尾，则无法归档。只需在末尾添加\。

2.方法二

1)。进入项目文件夹，删除bin和obj文件夹

2)。转到项目属性并增加版本号并更改版本名称

3)。现在点击存档