遍历文件夹，查找文件夹

public static string[] GetDirectories2(string dir, string regexPattern = null, int depth = 0, bool throwEx = false)
        {
            List<string> lst = new List<string>();

            try
            {
                foreach (string item in Directory.GetDirectories(dir))
                {
                    try
                    {
                        if (regexPattern != null && item.Contains(regexPattern))
                        { 
                            lst.Add(item); 
                        }

                        //递归
                        if (depth != 0) { lst.AddRange(GetDirectories2(item, regexPattern, depth - 1, throwEx)); }
                    }
                    catch { if (throwEx) { throw; } }
                }
            }
            catch { if (throwEx) { throw; } }

            return lst.ToArray();
        }

/// <summary>
        /// 查找指定名称的文件夹，默认深度6
        /// </summary>
        /// <param name="path">要查找的路径</param>
        /// <param name="searchDirName">要查找的文件夹名称</param>
        /// <param name="depth">查找深度</param>
        /// <returns></returns>
        List<string> FindDirPath(string path, string searchDirName, int depth = 6)
        {
            List<string> lst = new List<string>();

            try
            {
                string[] dirs = Directory.GetDirectories(path);
                foreach (string dir in dirs)
                {
                    if (dir.Contains("$RECYCLE.BIN") || dir.Contains("System Volume Information"))
                        continue;

                    string dirName = dir.Substring(dir.LastIndexOf("\\") + 1);

                    if (dirName.ToLower().EndsWith("temp")) //本程序需要跳过temp文件夹
                        continue;

                    if (dirName == searchDirName)
                    {
                        lst.Add(dir);
                        break;  //遇到第一个匹配则返回
                    }
                    //递归
                    if (depth != 0)
                    {
                        lst.AddRange(FindDirPath(dir, searchDirName));
                    }
                    
                }
            }
            catch (Exception ex)
            {
                UILog("FindDirPath1 ex:" + ex.Message);
            }

            return lst;
        }