class Program
{
  static void Main(string[] args)
  {
    Console.WriteLine("輸入目標文件夾");
    string path = Console.ReadLine();
    FindFoldersAndFiles(path);
    Console.WriteLine("\r\n");
    Console.WriteLine("目標文件夾的總大小為：{0}個字節(jié)",GetDirectoryLength(path));
    Console.ReadKey();
  }
 
  //遞歸目標文件夾中的所有文件和文件夾
  private static void FindFoldersAndFiles(string path)
  {
    Console.WriteLine("文件夾" + path);
    //遍歷目標文件夾的所有文件
    foreach (string fileName in Directory.GetFiles(path))
    {
      Console.WriteLine("┣" + fileName);
    }
 
    //遍歷目標文件夾的所有文件夾
    foreach (string directory in Directory.GetDirectories(path))
    {
      FindFoldersAndFiles(directory);
    }
  }
 
  //遞歸計算文件夾大小
  static long GetDirectoryLength(string path)
  {
    if (!Directory.Exists(path))
    {
      return 0;
    }
 
    long size = 0;
 
    //遍歷指定路徑下的所有文件
    DirectoryInfo di = new DirectoryInfo(path);
    foreach (FileInfo fi in di.GetFiles())
    {
      size += fi.Length;
    }
 
    //遍歷指定路徑下的所有文件夾
    DirectoryInfo[] dis = di.GetDirectories();
    if (dis.Length > 0)
    {
      for (int i = 0; i < dis.Length; i++)
      {
        size += GetDirectoryLength(dis[i].FullName);
      }
    }
 
    return size;
  }
}