c#遍历一个文件夹下的所有文件包括子文件夹(转载)
using System;
using System.IO;

class ListAllFilesDemo
{
public static void Main()
{
Console.Write("请输入要查询的目录: ");
string dir = Console.ReadLine();
try
{
ListFiles(new DirectoryInfo(dir));
}
catch (IOException e)
{
Console.WriteLine(e.Message);
Console.ReadLine();
}
}

public static void ListFiles(FileSystemInfo info)
{
if (!info.Exists) return;

DirectoryInfo dir = info as DirectoryInfo;
//不是目录
if (dir == null) return;

FileSystemInfo[] files = dir.GetFileSystemInfos();
for (int i = 0; i < files.Length; i++)
{
FileInfo file = files[i] as FileInfo;
//是文件
if (file != null)
Console.WriteLine(file.FullName + "\t " + file.Length);
//对于子目录，进行递归调用
else
ListFiles(files[i]);
}
}
}