C#文件帮助类FoderHelper

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";
}
}
else
{
viewstr = m.ToString() + "KB";
}
}
else
{
viewstr = m.ToString() + "byte";
}
return viewstr;
}
/// <summary>
/// 删除指定目录和内容
/// </summary>
/// <param name="dir"></param>
/// <returns></returns>
public static bool delDir(string dir)
{
bool flag = false;
DirectoryInfo d = new DirectoryInfo(dir);
if (d.Exists)//判断目录是否存在
{
try
{
d.Delete();
flag = true;
}
catch (Exception e) { flag = false; }
}
return flag;
}
/// <summary>
/// 删除指定文件
/// </summary>
/// <param name="fil"></param>
/// <returns></returns>
public static bool delFile(string fil)
{
bool flag = false;
FileInfo d = new FileInfo(fil);
if (d.Exists)//判断目录是否存在
{
try
{
d.Delete();
flag = true;
}
catch (Exception e) { flag = false; }
}
return flag;
}
public static void Copy(string sourceDirectory, string targetDirectory)
{
DirectoryInfo diSource = new DirectoryInfo(sourceDirectory);
DirectoryInfo diTarget = new DirectoryInfo(targetDirectory);

CopyAll(diSource, diTarget);
}
/// <summary>
/// 复制目录及子文件到指定目录
/// </summary>
/// <param name="source"></param>
/// <param name="target"></param>
public static void CopyAll(DirectoryInfo source, DirectoryInfo target)
{
// Check if the target directory exists, if not, create it.
if (Directory.Exists(target.FullName) == false)
{
Directory.CreateDirectory(target.FullName);
}

// Copy each file into it's new directory.
foreach (FileInfo fi in source.GetFiles())
{
Console.WriteLine(@"Copying {0}\{1}", target.FullName, fi.Name);
fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);
}

// Copy each subdirectory using recursion.
foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
{
DirectoryInfo nextTargetSubDir =
target.CreateSubdirectory(diSourceSubDir.Name);
CopyAll(diSourceSubDir, nextTargetSubDir);
}
}

/// <summary>
/// 循环读取某个目录下的所有文件和目录，查询有关每一项的一些信息。返回一个文件列表
/// </summary>
/// <param name="strCurrentDir"></param>
public static List<fileEntity> FileView(string strCurrentDir)
{
List<fileEntity> fileList = new List<fileEntity>();
DirectoryInfo dir = new DirectoryInfo(strCurrentDir);

foreach (FileSystemInfo fsi in dir.GetFileSystemInfos())//这个循环再读取文件的信息
{
try
{
//FileSystemInfo 对象可以表示文件或目录，从而可以作为 FileInfo 或 DirectoryInfo 对象的基础。 当分析许多文件和目录时，请使用该基类。
FileInfo fi;
DirectoryInfo di;
//创建一个自己写的实体类的实体
fileEntity newfile = new fileEntity();
if (fsi is FileInfo)//外层循环读取文件信息
{
//表示当前fsi是文件
fi = (FileInfo)fsi;
newfile.fileName = fi.Name;
newfile.fileExt = fi.Extension;
newfile.fileSize = fi.Length;
newfile.FileModify = fi.LastWriteTime;
//通过扩展名来选择文件显示图标
switch (newfile.fileExt)
{
case ".gif":
newfile.picName = "gif.gif";
break;
default:
newfile.picName = "other.gif";
break;
}
newfile.picName = "<img src='" + newfile.picName + "' width=25 height=20>";
}
else
{
di = (DirectoryInfo)fsi;
newfile.fileName = di.Name;
newfile.fileSize = DirSize(di);//调用计算文件夹大小的方法
newfile.FileModify = di.LastWriteTime;
newfile.picName = "<img src='directory.gif' width=25 height=20>";
}
fileList.Add(newfile);
}
catch (Exception e) { }
}
return fileList;

}

/// <summary>
/// 显示目录和文件
/// </summary>
/// <param name="path"></param>
public static void All(string path)
{
FileInfo fi;//文件
DirectoryInfo di;//目录
DirectoryInfo dir=null;
int i = 0; //控制行的颜色
try
{
dir = new DirectoryInfo(path);
}
catch (Exception e) { }
foreach (FileSystemInfo fsi in dir.GetFileSystemInfos())
{
try
{
fileEntity newfile = new fileEntity();
FolderEntity folder = new FolderEntity();
newfile.fileName = "";
newfile.picName = "";
newfile.fileExt = "";
newfile.fileSize = 0;
folder.folderName = "";
folder.picName = "";

i += 1;
if (fsi is FileInfo)//判断当前读取的是不是一个文件
{
//表示当前fsi是文件
fi = (FileInfo)fsi;
newfile.fileName = fi.Name;
newfile.fileExt = fi.Extension;
newfile.fileSize = fi.Length;
newfile.FileModify = fi.LastWriteTime;

//将文件加上可以下载文件的链接

newfile.fileName = "<a href='........'></a>";

//通过扩展名来选择文件显示图标

//Response.Write(Session["DataBasePath"].ToString()+"\\filetype\\"+pfun.getFileExt(FileExt)+".gif");

if (fsi.Exists)
{
switch (newfile.fileExt)
{
case ".gif":
newfile.picName = "gif.gif";
break;
default:
newfile.picName = "other.gif";
break;
}
}
else
{
newfile.picName = "unknown.gif";
}

/*
switch(FileExt)
{
case ".gif":
FilePic = "gif.gif";
break;
default:
FilePic = "other.gif";
break;
}
*/

newfile.picName = "<img src='filetype/" + newfile.picName + "' width=16 height=16>";

}
else
{
//当前为目录
di = (DirectoryInfo)fsi;
folder.folderName = di.Name;

//给目录加上链接

folder.folderName = "<a href='.......'><a>";
folder.lastTime = di.LastWriteTime;
folder.picName = "<img src='filetype/folder.gif' width=16 height=16>";

}
}catch(Exception e){}
}

}
}
}