C#遍历获取所有文件

/// <summary>
        /// 遍历获取所有文件
        /// </summary>
        /// <param name="filePathByForeach"></param>
        /// <param name="result"></param>
        public static void ForeachFile(string filePathByForeach, ref string result)
        {
            try
            {
                DirectoryInfo theFolder = new DirectoryInfo(filePathByForeach);
                DirectoryInfo[] dirInfo = theFolder.GetDirectories();//获取所在目录的文件夹
                FileInfo[] file = theFolder.GetFiles();//获取所在目录的文件

                foreach (FileInfo fileItem in file) //遍历文件
                {
                    result += fileItem.DirectoryName + @"\" + fileItem.Name + "\n";
                }
                //遍历文件夹
                foreach (DirectoryInfo NextFolder in dirInfo)
                {
                    ForeachFile(NextFolder.FullName, ref result);
                }

            }
            catch (Exception)
            {
                throw;
            }

        }