using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Collections;

/// <summary>
/// 文件操作相关工具集
/// </summary>
public partial class Utils
{
    /// <summary>
    /// 递归遍历文加下所有指定后缀文件
    /// </summary>
    /// <param name="info"></param>
    /// <param name="total">文件列表</param>
    /// <param name="opt">文件后缀</param>
    public static void ListFiles(string path, ref ArrayList total, string opt)
    {
        DirectoryInfo dir = new DirectoryInfo(path);

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

    /// <summary>
    /// 文件夹拷贝
    /// </summary>
    /// <param name="from">源文件夹</param>
    /// <param name="to">目标文件夹</param>
    public static void CopyFolder(string from, string to)
    {
        if (!Directory.Exists(to))
        {
            Directory.CreateDirectory(to);
        }            

        // 子文件夹
        foreach (string sub in Directory.GetDirectories(from))
        {
            CopyFolder(sub + "\\", to + Path.GetFileName(sub) + "\\");
        }            

        // 文件
        foreach (string file in Directory.GetFiles(from))
        {
            File.Copy(file, to + Path.GetFileName(file), true);
        }            
    }
}