NuGet.PackageBuilder.ValidateReferenceAssemblies C# (CSharp) Method

        internal static void ValidateReferenceAssemblies(IEnumerable<IPackageFile> files, IEnumerable<PackageReferenceSet> packageAssemblyReferences)
        {
            var libFiles = new HashSet<string>(from file in files
                                               where !String.IsNullOrEmpty(file.Path) && file.Path.StartsWith("lib", StringComparison.OrdinalIgnoreCase)
                                               select Path.GetFileName(file.Path), StringComparer.OrdinalIgnoreCase);

            foreach (var reference in packageAssemblyReferences.SelectMany(p => p.References))
            {
                if (!libFiles.Contains(reference) &&
                    !libFiles.Contains(reference + ".dll") &&
                    !libFiles.Contains(reference + ".exe") &&
                    !libFiles.Contains(reference + ".winmd"))
                {
                    throw new InvalidDataException(String.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_InvalidReference, reference));
                }
            }
        }