两个引用程序集之间的冲突

Question

我正在使用运行良好的.Net Core 应用程序。但是，今天我发现output 包含一个警告。将日志级别设置为detailed 后，我发现以下内容：

2>    Dependency "Microsoft.Extensions.DependencyModel, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60".
2>        Could not resolve this reference. Could not locate the assembly "Microsoft.Extensions.DependencyModel, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
2>            For SearchPath "C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5".
2>            Considered "C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\Microsoft.Extensions.DependencyModel.winmd", but it didn't exist.
2>            Considered "C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\Microsoft.Extensions.DependencyModel.dll", but it didn't exist.
2>            Considered "C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\Microsoft.Extensions.DependencyModel.exe", but it didn't exist.
2>            For SearchPath "{CandidateAssemblyFiles}".
2>            Considered "C:\Users\Alex\.nuget\packages\xunit.runner.visualstudio\2.2.0-beta4-build1194\build\netcoreapp1.0\xunit.runner.visualstudio.dotnetcore.testadapter.dll",
2>              but its name "xunit.runner.visualstudio.dotnetcore.testadapter"
2>              didn't match the expected name "Microsoft.Extensions.DependencyModel, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60".
2>            Considered "C:\Users\Alex\.nuget\packages\xunit.runner.visualstudio\2.2.0-beta4-build1194\build\netcoreapp1.0\xunit.runner.utility.dotnet.dll",
2>              but its name "xunit.runner.utility.dotnet"
2>              didn't match the expected name "Microsoft.Extensions.DependencyModel, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60".
2>        Required by "C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\testhost.dll".
2>        Required by "C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\Microsoft.TestPlatform.CrossPlatEngine.dll".
2>    There was a conflict between "Microsoft.Extensions.DependencyModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60" and "Microsoft.Extensions.DependencyModel, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60".
2>        "Microsoft.Extensions.DependencyModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60" was chosen because it was primary and "Microsoft.Extensions.DependencyModel, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60" was not.
2>        References which depend on "Microsoft.Extensions.DependencyModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60" [C:\Users\Alex\.nuget\packages\microsoft.extensions.dependencymodel\1.0.0\lib\netstandard1.6\Microsoft.Extensions.DependencyModel.dll].
2>            C:\Users\Alex\.nuget\packages\microsoft.extensions.dependencymodel\1.0.0\lib\netstandard1.6\Microsoft.Extensions.DependencyModel.dll
2>              Project file item includes which caused reference "C:\Users\Alex\.nuget\packages\microsoft.extensions.dependencymodel\1.0.0\lib\netstandard1.6\Microsoft.Extensions.DependencyModel.dll".
2>                C:\Users\Alex\.nuget\packages\microsoft.extensions.dependencymodel\1.0.0\lib\netstandard1.6\Microsoft.Extensions.DependencyModel.dll
2>        References which depend on "Microsoft.Extensions.DependencyModel, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60" [].
2>            C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\Microsoft.TestPlatform.CrossPlatEngine.dll
2>              Project file item includes which caused reference "C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\Microsoft.TestPlatform.CrossPlatEngine.dll".
2>                C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\testhost.dll
2>                C:\Users\Alex\.nuget\packages\microsoft.testplatform.testhost\15.0.0-preview-20161123-03\lib\netstandard1.5\Microsoft.TestPlatform.CrossPlatEngine.dll
2>    C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets(1909,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved.  These reference conflicts are listed in the build log when log verbosity is set to detailed.
2>  Done executing task "ResolveAssemblyReference".

There was a conflict between "Microsoft.Extensions.DependencyModel... 行。我不知道如何解决这个警告，因为我只是使用来自NuGet 的.Net standard 1.1 和System.Reflection.Emit 包并且不引用任何其他内容。

当然，我可以忽略这个警告，但是寻找一些解决方案

Answer 1

根据详细日志，我们发现你的代码需要依赖“Microsoft.Extensions.DependencyModel, Version=1.0.1.0。但是这个Version=1.0.0.0的依赖已经安装了。

所以当我们编译项目时，会选择 Version=1.0.0.0 的 this 依赖，这会导致冲突。因此，您可以使用 NuGet 添加指定版本=1.0.1.0 的依赖项“Microsoft.Extensions.DependencyModel”来解决此警告问题。