C#实现递归列目录

using System;using System.Linq;using System.Text;using System.IO;using System.Collections;namespace TestApplicationFileSystem{    class Program    {               private static void ListFile(FileSystemInfo fileinfo,int level)        {            if (!fileinfo.Exists)            {                Console.Write("无此文件夹或路径");                return;            }            else            {                string preStr = "";                for (int i = 0; i < level; i++)                {                    preStr += "-";                }                DirectoryInfo di = fileinfo as DirectoryInfo;                FileSystemInfo[] files = di.GetFileSystemInfos();                for (int i = 0; i < files.Length; i++)                {                    FileInfo file = files[i] as FileInfo;                    if (file != null)                    {                        Console.Write(" "+preStr+file.Name);                        Console.Write("\n");                    }                    else                    {                        Console.Write(" "+preStr+files[i].Name + "(文件夹)");                        Console.Write("\n");                        ListFile(files[i],level+1);                                                                   }                }            }                    }        static void Main(string[] args)        {            FileSystemInfo f = new DirectoryInfo("c:\\Test");            ListFile(f,0);            Console.ReadLine();                    }    }}