Visual Studio references中的package找不到

1. 把solution里面所有project的.net版本设成一样的

2. 

ERROR: 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}.

解决方法：

从.csproj文件中删掉如下code：

<Import Project="$(SolutionDir).nugetNuGet.targets" Condition="Exists('$(SolutionDir).nugetNuGet.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
  <PropertyGroup>
    <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable 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('$(SolutionDir).nugetNuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir).nugetNuGet.targets'))" />
</Target>

3.

ERROR: Type or namespace name could not be found

解决方法：

Tools -> NuGet Package Manager -> Package Manager Control

Update-Package –reinstall