停止寻找System.Threading.Tasks.Extensions.dll 4.2.0.0的构建

debugcn 发表于 Dev

帕特·朗-Munkii Yebee

我们有一个Xamarin Forms项目，该项目可以在VS20198中很好地构建，但是iOS构建在Azure DevOps（ADO）中的托管Mac上失败

查看ADO build的输出

2019-10-15T17:04:27.5851930Z MTOUCH : error MT2001: Could not link assemblies. Reason: Error while processing references of 'ProjectBreatheApp.iOS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' [/Users/vsts/agent/2.158.0/work/1/s/ProjectBreatheApp/ProjectBreatheApp.iOS/ProjectBreatheApp.iOS.csproj]
2019-10-15T17:04:27.5852990Z   --- inner exception
2019-10-15T17:04:27.5899390Z   Mono.Linker.LoadException: Error while processing references of 'ProjectBreatheApp.iOS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' ---> Mono.Linker.LoadException: Error while processing references of 'ProjectBreatheApp.Forms, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' ---> Mono.Linker.LoadException: Error while processing references of 'FreshMvvm, Version=1.0.7010.22624, Culture=neutral, PublicKeyToken=null' ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'System.Threading.Tasks.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'System.Threading.Tasks.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
2019-10-15T17:04:27.5901640Z     at Mono.Cecil.BaseAssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference name, Mono.Cecil.ReaderParameters parameters) [0x00105] in <c00644197a08419abff2c4cf790b9f65>:0 
2019-10-15T17:04:27.5903940Z     at Mono.Linker.AssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference name, Mono.Cecil.ReaderParameters parameters) [0x00071] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/external/linker/linker/Linker/AssemblyResolver.cs:80 
2019-10-15T17:04:27.5904560Z     at Mono.Linker.LinkContext.Resolve (Mono.Cecil.IMetadataScope scope) [0x00009] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/external/linker/linker/Linker/LinkContext.cs:210 
2019-10-15T17:04:27.5906030Z      --- End of inner exception stack trace ---

我可以看到它找不到STTE的4.2.0.0版本。该版本不存在，我不相信它曾经存在。如何告诉该版本采用其他版本？

我们不是直接引用STTE，我们正在使用的库，链接堆栈跟踪中的FreshMVVM不是直接引用它，更重要的是，我确实有一个使用该FreshMVVM的简单XF项目的ADO iOS构建版本。

许多其他人在参考4.2.0.0 STTE时遇到了问题，他们建议对文件进行明确的参考。我无法解决这个问题。

豪尔赫·拉莫斯·埃圭诺亚

我在System.Threading.Tasks.Extensions中遇到了类似的问题，我的项目在本地构建良好，但在Azure Pipelines中却没有。

问题是，默认情况下，代理“ macOS-10.14”不使用最新的Mono和Xamarin.iOS SDK。

通过切换到最新的XCode（11.1），NetCore 2.x，Mono（6.4）和Xamarin.iOS SDK解决了我的问题。

这是我用来配置管道的任务：

- task: UseDotNet@2
  displayName: 'Use .Net Core sdk 2.x'
  inputs:
    version: 2.x

- bash: |
   SYMLINK=6_4_0
       MONOPREFIX=/Library/Frameworks/Mono.framework/Versions/$SYMLINK
       echo "##vso[task.setvariable variable=DYLD_FALLBACK_LIBRARY_PATH;]$MONOPREFIX/lib:/lib:/usr/lib:$DYLD_LIBRARY_FALLBACK_PATH"
       echo "##vso[task.setvariable variable=PKG_CONFIG_PATH;]$MONOPREFIX/lib/pkgconfig:$MONOPREFIX/share/pkgconfig:$PKG_CONFIG_PATH"
       echo "##vso[task.setvariable variable=PATH;]$MONOPREFIX/bin:$PATH"

  displayName: 'Select Mono Version'

- bash: |
   echo "Select Xamarin Version"
       /bin/bash -c "sudo $AGENT_HOMEDIRECTORY/scripts/select-xamarin-sdk.sh 6_4_0"
  displayName: 'Select Xamarin Version'

- bash: |
   echo '##vso[task.setvariable variable=MD_APPLE_SDK_ROOT;]'/Applications/Xcode_11.1.app;sudo xcode-select --switch /Applications/Xcode_11.1.app/Contents/Developer

  displayName: 'Select XCode Version'