static void Main(string[] args)
        {

 　　　　string path = string.Format(@"C:\Users\Administrator\Desktop\{0}", @"shenzheng");//根目录
            List<string> filePaths = GetAllDirectories(path);//返回根目录下所有文件（包括路径）的集合
            foreach (var item in filePaths)
            {
                StreamReader read = new StreamReader(item, Encoding.UTF8);//根据文件路径获取文件流
                string fileName = Path.GetFileNameWithoutExtension(item);//文件名
                string filePath = Path.GetDirectoryName(item);//文件所在文件夹
                if (!read.EndOfStream)//是否读取完成
                {
                    string aline = read.ReadToEnd();//读取全部------//string aline = read.ReadLine();读取一行
                    Console.WriteLine(read.ReadLine());
                    string keyStar = "***";//关键字开始
                    string ketEnd = "&&&";//关键字结束//获取之间的字符串
                    int star = aline.IndexOf(keyStar) + keyStar.Length;//加上keyStar所占的位数
                    int end = aline.IndexOf(ketEnd);
                    if (star > 0 && end > star)//未找到关键字
                    {
                        string newstr = aline.Substring(star, end - star);
                        Console.WriteLine(newstr);//打印到控制台，查看是否截取想要的信息
                        Console.WriteLine(fileName + "打印完毕");
                        //char[] dd = new char[] { ‘]‘, ‘,‘ };
                        string[] strs = newstr.Split(new string[] { "分割字符串" }, StringSplitOptions.RemoveEmptyEntries);//根据规则分割你想要的字符串获得字符串集合
                        StreamWriter sw = new StreamWriter(@"C:\Users\Administrator\Desktop\out\" + fileName + "处理.txt", false);//输出目录及文件名称定义
                        for (int i = 0; i < strs.Count(); i++)
                        {
                            Console.WriteLine(strs[i] + "," + (i + 1).ToString());//打印到控制台
                            sw.WriteLine(strs[i] + "," + (i + 1).ToString());//写到文件
                            sw.Flush();//清空StreamWriter缓存,否则会写不全
                            Thread.Sleep(20);

                        }
                        Console.WriteLine(fileName + "写入完毕");
                        Console.ReadKey();
                    }
                    else
                    {
                        Console.WriteLine("当前文档" + fileName + "没有符合规则的数据，跳过！");
                    }
                }
            }

　　  　　static List<string> filesList = new List<string>();
       　　 public static List<string> GetAllDirectories(string rootPath)
        　　{
           　　 string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目录

           　　 foreach (string path in subPaths)
           　　 {
               　　 GetAllDirectories(path);//对每一个字目录做与根目录相同的操作：即找到子目录并将当前目录的文件名存入List
           　　 }
            　　string[] files = Directory.GetFiles(rootPath);
           　　 foreach (string file in files)
            　　{
                　　filesList.Add(file);//将当前目录中的所有文件全名存入文件List
            　　}
           　　 return filesList;
        　　}

　　}

c# .net获取文件夹下的所有文件（多层递归），并获取区间数据（Jsion,xml等数据）写出到处理文件，学习分享~