NuGet packages not restore in visual studio 2017

Question

I have Asp.netCore solution which was working fine on Visual Studio 2015 and then i moved to Visual Studio 2017. Now the problem is that in Visual Studio 2017 on every nuget packages there is yellow exclamation mark. Following are solution which i have tried so far.

I'm using Visual Studio Version: 15.3.1

• Run as 'Administrator' and restore package.
• Clear All Nugget Cache(s) from Tools > options > NuGet Package Manager > and again restore Nuget.

Note: I have searched and found following solution and tried but did not resolve my issue.

Solution 1

Answer 1

I found the answer on another thread here and credit should go to @AxelWass although he did not specifically focus it towards this, it absolutely fixes this issue. The above answer did not.

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I had the same issue and solve it by opening the project in a text editor and deleting the following section:

<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
  <PropertyGroup>
     <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
   </PropertyGroup>
   <Error Condition="!Exists('..\packages\Microsoft.Net.Compilers.1.0.0\build\Microsoft.Net.Compilers.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Net.Compilers.1.0.0\build\Microsoft.Net.Compilers.props'))" />
   <Error Condition="!Exists('..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.1.0.0\build\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.1.0.0\build\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
</Target>

Once this is removed, it will resolve this nightmare issue that VS2017 and PM seems to be unable to resolve. I too have run into this multiple times - especially when I blend many projects in the same solutions directory.

Answer 2

As mentioned in Microsoft Installing and reinstalling packages with package restore Documentation, you should Update-Package -reinstall:

Update-Package -reinstall -ProjectName <project> command where is the name of the affected project as it appears in Solution Explorer. Use Update-Package -reinstall by itself to restore all packages in the solution.

If you still have the error, try edit your project file, check if there is A path refrence error there, also check the project/solution nuget config file.