Microsoft.VisualStudio.Project.ProjectNode.AddFolderToMsBuild C# (CSharp) Method

        protected virtual ProjectElement AddFolderToMsBuild(string folder)
        {
            ProjectElement newItem;

            string itemPath = PackageUtilities.MakeRelativeIfRooted(folder, this.BaseURI);
            Debug.Assert(!Path.IsPathRooted(itemPath), "Cannot add item with full path.");

            newItem = this.CreateMsBuildFileItem(itemPath, ProjectFileConstants.Folder);

            return newItem;
        }