递归实现显示目标文件夹的所有文件和文件夹,并计算目标文件夹的大小

递归的一个典型应用就是遍历目标文件夹，把该文件夹下的所有文件和文件夹打印或显示出来，还可以递归计算目标文件夹的总大小。

  1:     class PRogram
  2:     {
  3:         static void Main(string[] args)
  4:         {
  5:             Console.WriteLine("输入目标文件夹");
  6:             string path = Console.ReadLine();
  7:             FindFoldersAndFiles(path);
  8:             Console.WriteLine("/r/n");
  9:             Console.WriteLine("目标文件夹的总大小为：{0}个字节",GetDirectoryLength(path));
 10:             Console.ReadKey();
 11:         }
 12: 
 13:         //递归目标文件夹中的所有文件和文件夹
 14:         private static void FindFoldersAndFiles(string path)
 15:         {
 16:             Console.WriteLine("文件夹" + path);
 17:             //遍历目标文件夹的所有文件
 18:             foreach (string fileName in Directory.GetFiles(path))
 19:             {
 20:                 Console.WriteLine("┣" + fileName);
 21:             }
 22: 
 23:             //遍历目标文件夹的所有文件夹
 24:             foreach (string directory in Directory.GetDirectories(path))
 25:             {
 26:                 FindFoldersAndFiles(directory);
 27:             }
 28:         }
 29: 
 30:         //递归计算文件夹大小
 31:         static long GetDirectoryLength(string path)
 32:         {
 33:             if (!Directory.Exists(path))
 34:             {
 35:                 return 0;
 36:             }
 37: 
 38:             long size = 0;
 39: 
 40:             //遍历指定路径下的所有文件
 41:             DirectoryInfo di = new DirectoryInfo(path);
 42:             foreach (FileInfo fi in di.GetFiles())
 43:             {
 44:                 size += fi.Length;