True NuGet $(MSBuildThisFileDirectory)project.assets.json $(UserProfile)\.nuget\packages\ C:\Users\Lenovo\.nuget\packages\;D:\开发工具\Visual Studio 2019\Shared\NuGetPackages;C:\Program Files\dotnet\sdk\NuGetFallbackFolder PackageReference 6.5.0 C:\Users\Lenovo\.nuget\packages\microsoft.extensions.apidescription.server\3.0.0