using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Security.AccessControl;
using System.Security.Permissions;
namespace Bll
{
    public class FolderHelper
    {
        //判断文件夹是否存在
        public static bool checkFolderExits(string path)
        {
            DirectoryInfo dir = new DirectoryInfo(path);
            if (dir.Exists)//文件夹存在
            {   
                return true;
            }
            else
            {
               //dir.Create();//不存在就创建一个
                return false;
            }
        }
        //创建一个文件夹，存在就创建失败
        public static bool CreateNewFolder(string path)
        {
            DirectoryInfo dir = new DirectoryInfo(path);

            if (!dir.Exists)
            {
                dir.Create();
                return true;
            }
            else
                return false;
        }
        /// <summary>
        /// 在指定目录下创建指定名称文件夹
        /// </summary>
        /// <param name="ParentsPath"></param>
        /// <param name="NewFolderName"></param>
        /// <returns></returns>
        public static bool CreateNewFolder(string ParentsPath, string NewFolderName)
        {
            string CreatePath = ParentsPath + @"\" + NewFolderName;
            DirectoryInfo dir = new DirectoryInfo(CreatePath);

            if (!dir.Exists)
            {
                dir.Create();
                return true;
            }
            else
                return false;
        }
        /// <summary>
        /// 返回目录下的所有文件名
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static ArrayList getAllFiles(string path)
        {
            DirectoryInfo dir = new DirectoryInfo(path);
            if (dir.Exists)
            {
                FileInfo[] fileinfo = dir.GetFiles();
                ArrayList list = new ArrayList();
                foreach (FileInfo f in fileinfo)
                {
                    list.Add(f.Name);
                }
                return list;
            }
            else
                return null;
        }
        /// <summary>
        /// 计算文件夹的大小
        /// </summary>
        /// <param name="d"></param>
        /// <returns></returns>
        public static long DirSize(DirectoryInfo d)
        {
            long Size = 0;
            // Add file sizes.
            FileInfo[] fis = d.GetFiles();//获得目录文件列表
            foreach (FileInfo fi in fis)
            {
                Size += fi.Length;
            }
            // Add subdirectory sizes.
            DirectoryInfo[] dis = d.GetDirectories();//获取目录子目录列表
            foreach (DirectoryInfo di in dis)
            {
                Size += DirSize(di);
            }
            return Size;
        }
        /// <summary>
        /// 把文件夹得大小转换成比较合适的表示单位
        /// </summary>
        /// <param name="size"></param>
        /// <returns></returns>
        public static string ViewSize(long size)
        {
            long m=size;
            string viewstr;
            
            if ((m / 1024) > 0)//表示可以转换成KB
            {
                m = m / 1024;//转换成KB
                
                if ((m / 1024) > 0)//表示可以转换成MB
                {
                    m = m / 1024;//转换成MB了

                    if ((m / 1024) > 0)//表示可以转换成GB
                    {
                        m = m / 1024;//转换成GB了
                        viewstr = m.ToString() + "GB";
                    }
                    else
                    {
                        viewstr = m.ToString() + "MB";