PackageExplorerViewModel.PackageViewModel.AddContentFileExecute C# (CSharp) Метод

        private void AddContentFileExecute(object parameter)
        {
            PackageFolder folder = (parameter ?? SelectedItem) as PackageFolder;
            if (folder != null) {
                AddExistingFileToFolder(folder);
            }
            else {
                AddExistingFileToFolder(RootFolder);
            }
        }