txt解析：指定的几个 文件夹

1. project.json

     "Count": "8",

2. ProjcetSetting.cs

   public int Count { get; set; }

3. AreaSRCHourJob.cs

     private  int count = 0;

     count = projectOption.Options.Count;

     //将文件夹按日期倒序排，获取前8个文件夹

     from siteDir in dateDirs.OrderByDescending(x=>x.FileInfo.Name).Take(count)