当项目升级到 .Net Framework 4.7.2 时，从面向 .Net Framework 4.6 的项目中引用的 DLL 不再出现在 bin 中

Question

我有两个项目，[Service] 和 [Web]。两者最初都是针对 .Net Framework 4.6 构建的。 [Web] 引用 [Service]，并使用 [Service] 通过 NuGet 包安装的一些 DLL（特别是 System.Runtime.InteropServices.RuntimeInformation.dll 和 System.Net.Http.dll）。

[Web] 需要升级到目标 .Net Framework 4.7.2。这已经完成了，但是[Service] 中的这两个DLL 不再出现在[Web] 的bin/ 目录中。

我正在使用 Visual Studio 2017 Enterprise。

• 我已经确认，如果我将 [Web] 降级到 .Net Framework 4.6，DLL 会重新出现。但是，对于其他 DLL，[Web] 需要在 4.7.2 上，并且 [Service] 需要保持在 4.6 上。
• System.Runtime.InteropServices.RuntimeInformation.dll 来自Microsoft.AspNetCore.Mvc
• System.Net.Http 来自自己的 Nuget 包

编辑：

我后来发现这深深地隐藏在构建的详细日志中：

Unified Dependency "System.Runtime.InteropServices.RuntimeInformation, Version=4.0.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
29>        Using this version instead of original version "4.0.1.0" in "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.hosting\1.1.2\lib\net451\Microsoft.AspNetCore.Hosting.dll" because AutoUnify is 'true'.
29>        Using this version instead of original version "4.0.1.0" in "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.server.kestrel\1.1.2\lib\net451\Microsoft.AspNetCore.Server.Kestrel.dll" because AutoUnify is 'true'.
29>        Using this version instead of original version "4.0.1.0" in "C:\Users\baker\.nuget\packages\microsoft.extensions.logging.console\1.1.2\lib\net451\Microsoft.Extensions.Logging.Console.dll" because AutoUnify is 'true'.
29>        Resolved file path is "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\Facades\System.Runtime.InteropServices.RuntimeInformation.dll".
29>        Reference found at search path location "{TargetFrameworkDirectory}".
29>            For SearchPath "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.hosting\1.1.2\lib\net451".
29>            Considered "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.hosting\1.1.2\lib\net451\System.Runtime.InteropServices.RuntimeInformation.winmd", but it didn't exist.
29>            Considered "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.hosting\1.1.2\lib\net451\System.Runtime.InteropServices.RuntimeInformation.dll", but it didn't exist.
29>            Considered "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.hosting\1.1.2\lib\net451\System.Runtime.InteropServices.RuntimeInformation.exe", but it didn't exist.
29>            For SearchPath "{CandidateAssemblyFiles}".
29>            Considered "net472Dlls\System.Net.Http.dll",
29>             but its name "System.Net.Http"
29>             didn't match the expected name "System.Runtime.InteropServices.RuntimeInformation, Version=4.0.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
29>            Considered "net472Dlls\System.Runtime.InteropServices.RuntimeInformation.dll",
29>             but its name "System.Runtime.InteropServices.RuntimeInformation, Version=4.0.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
29>             didn't match the expected name "System.Runtime.InteropServices.RuntimeInformation, Version=4.0.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
29>            For SearchPath "{TargetFrameworkDirectory}".
29>            Considered "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Runtime.InteropServices.RuntimeInformation.winmd", but it didn't exist.
29>            Considered "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Runtime.InteropServices.RuntimeInformation.dll", but it didn't exist.
29>            Considered "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\System.Runtime.InteropServices.RuntimeInformation.exe", but it didn't exist.
29>            Considered "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\Facades\System.Runtime.InteropServices.RuntimeInformation.winmd", but it didn't exist.
29>        Required by "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.hosting\1.1.2\lib\net451\Microsoft.AspNetCore.Hosting.dll".
29>        Required by "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.server.kestrel\1.1.2\lib\net451\Microsoft.AspNetCore.Server.Kestrel.dll".
29>        Required by "C:\Users\baker\.nuget\packages\microsoft.aspnetcore.server.kestrel.https\1.1.2\lib\net451\Microsoft.AspNetCore.Server.Kestrel.Https.dll".
29>        Required by "C:\Users\baker\.nuget\packages\microsoft.extensions.logging.console\1.1.2\lib\net451\Microsoft.Extensions.Logging.Console.dll".
29>        This reference is not "CopyLocal" because it conflicted with another reference with the same name and lost the conflict.
29>        The ImageRuntimeVersion for this reference is "v4.0.30319".

Answer 1

听起来像this issue。

来自链接：

解决方法是为您的项目文件添加额外的包引用并排除其所有资产，以确保永远不会首选包实现。这可确保平台版本胜出，并且不会被 NuGet 目标删除。以下是如何针对 System.Net.Http.dll 案例执行此操作的示例：

<ItemGroup>
    <PackageReference Include="System.Net.Http" Version="4.3.3">
         <ExcludeAssets>All</ExcludeAssets> 
    </PackageReference>
</ItemGroup>