Older versions are not downloaded but are needed by the Nuget Package Manager

[chrisstankevitz]

See my post at https://stackoverflow.com/questions/57116073/nuget-exe-and-nuget-package-manager-resolve-different-dependencies/57150898#57150898

I don't know how Nuget works under the covers -- but the NGDD does not fetch some older deps that are supposedly satisfied by later versions (e.g. Microsoft.AspNetCore 1.1.x is not downloaded because another dep from another targeted framework already fetched Microsoft.AspNetCore 2.0.x).

This is a problem when the packages are brought over to an offline system and installed with NuGet Package Manager which sometimes demands the older 1.1.x packages. I don't know why the NPM is not satisified with 2.0.x when supposedly >= 1.1.x is required.

To "fix" the "problem" I modified GetRangedPackageVersion:

    private IPackage GetRangedPackageVersion(IQueryable<IPackage> packages, IVersionSpec versionSpec)
    {
      packages = packages.Where(o => o.Version == versionSpec.MinVersion);

      IPackage package = packages
          .OrderByDescending(o => o.Version)
          .FirstOrDefault();

      return package;
    }