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){}  
            }  


        }  
    }  
}  </pre>