/// <summary>
        /// Adds refresh files to the specified project for all assemblies references belonging to the packages specified by packageNames.
        /// </summary>
        /// <param name="project">The project.</param>
        /// <param name="packagesFileSystem">The file system pointing to 'packages' folder under the solution.</param>
        /// <param name="packageNames">The package names.</param>
        private void AddRefreshFilesForReferences(Project project, string repositoryPath, IEnumerable<PackageIdentity> packageNames)
        {
            if (project == null)
            {
                throw new ArgumentNullException("project");
            }

            if (repositoryPath == null)
            {
                throw new ArgumentNullException("repositoryPath");
            }

            if (!packageNames.Any())
            {
                return;
            }

            VSAPIProjectContext context = new VSAPIProjectContext();
            WebSiteProjectSystem projectSystem = new WebSiteProjectSystem(project, context);

            var root = EnvDTEProjectUtility.GetFullPath(project);

            foreach (var packageName in packageNames)
            {
                string packagePath = String.Format(CultureInfo.InvariantCulture, "{0}.{1}", packageName.Id, packageName.Version);

                DirectoryInfo packageFolder = new DirectoryInfo(Path.Combine(repositoryPath, packagePath));

                PackageFolderReader reader = new PackageFolderReader(packageFolder);

                var frameworkGroups = reader.GetReferenceItems();

                var groups = reader.GetReferenceItems();

                var fwComparer = new NuGetFrameworkFullComparer();
                FrameworkReducer reducer = new FrameworkReducer();
                NuGetFramework targetGroupFramework = reducer.GetNearest(projectSystem.TargetFramework, groups.Select(e => e.TargetFramework));

                if (targetGroupFramework != null)
                {
                    var refGroup = groups.Where(e => fwComparer.Equals(targetGroupFramework, e.TargetFramework)).FirstOrDefault();

                    foreach (string refItem in refGroup.Items)
                    {
                        string sourcePath = Path.Combine(packageFolder.FullName, refItem.Replace('/', Path.DirectorySeparatorChar));

                        // create one refresh file for each assembly reference, as per required by Website projects
                        // projectSystem.CreateRefreshFile(assemblyPath);
                        RefreshFileUtility.CreateRefreshFile(projectSystem, sourcePath, context);
                    }
                }
            }
        }