Metro style app 文件查找

Metro style app 文件查找（条件为用户输入的匹配条件）

  private async void SearchButton_Click(object sender, RoutedEventArgs e)
        {
            StorageFolder musicFolder = KnownFolders.MusicLibrary;

            List<string> fileTypeFilter = new List<string>();
            fileTypeFilter.Add("*");

            QueryOptions queryOptions = new QueryOptions(CommonFileQuery.OrderBySearchRank, fileTypeFilter);
            //use the user's input to make a query
            queryOptions.UserSearchFilter = InputTextBox.Text;
            StorageFileQueryResult queryResult = musicFolder.CreateFileQueryWithOptions(queryOptions);

            StringBuilder outputText = new StringBuilder();

            //find all files that match the query
            IReadOnlyList<StorageFile> files = await queryResult.GetFilesAsync();
            //output how many files that match the query were found
            if (files.Count == 0)
            {
                outputText.Append("No files found for '" + queryOptions.UserSearchFilter + "'");
            }
            else if (files.Count == 1)
            {
                outputText.Append(files.Count + " file found:\n\n");
            }
            else
            {
                outputText.Append(files.Count + " files found:\n\n");
            }

            //output the name of each file that matches the query
            foreach (StorageFile file in files)
            {
                outputText.Append(file.Name + "\n");
            }

            OutputTextBlock.Text = outputText.ToString();
        }