//复制文件夹
        public bool CopyDirectory(string srcdir = "", string desdir = "", bool result = false)
        {
            try
            {
                string folderName = "";
                string[] filenames;
                string srcfileName = "";
                string mblj = "";
                if (!Directory.Exists(desdir))
                {
                    Directory.CreateDirectory(desdir.Trim());
                }
                folderName = srcdir.Substring(srcdir.LastIndexOf("\\") + 1);
                filenames = Directory.GetFileSystemEntries(srcdir);
                foreach (string file in filenames)
                {
                    if (Directory.Exists(file))
                    {
                        mblj = desdir + "\\" + file.Substring(file.LastIndexOf("\\") + 1);
                        if (!Directory.Exists(mblj))
                        {
                            Directory.CreateDirectory(mblj);
                        }
                        CopyDirectory(file, mblj);
                    }
                    else
                    {
                        srcfileName = file.Substring(file.LastIndexOf("\\") + 1);
                        mblj = desdir + "\\" + srcfileName;
                        File.Copy(file, mblj, true);
                    }
                }
                return result = true;
            }
            catch (Exception)
            {
                return result = false;
            }
        }