贴文件目录的操作类

using System;
using System.Web;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;
using System.IO.Compression;

namespace Pub.Class
{
    /// <summary>
    /// 文件目录操作类
    /// </summary>
    public class FileFolder
    {
        #region CreateFolder/CreateDir
        /// <summary>
        /// 目录不存在时新建
        /// </summary>
        /// <param name="filePath">目录（相对路径）</param>
        public static void CreateFolder(string filePath)
        {
            string[] PathArr = filePath.Split(new string[] { "/" }, StringSplitOptions.None);
            string _path = PathArr[0];
            for (int i = 1; i < PathArr.Length; i++) {
                _path = _path + "/" + PathArr[i];
                string _filePath = HttpContext.Current.Server.MapPath(_path);
                if (!System.IO.Directory.Exists(_filePath)) {
                    System.IO.Directory.CreateDirectory(_filePath);
                }
            }
        }
  /// <summary>
  /// 创建目录
  /// </summary>
  /// <param name="name">名称</param>
  /// <returns>创建是否成功</returns>
  [DllImport("dbgHelp", SetLastError=true)]
  private static extern bool MakeSureDirectoryPathExists(string name);
        /// <summary>
  /// 建立文件夹
  /// </summary>
  /// <param name="name"></param>
  /// <returns></returns>
  public static bool CreateDir(string name)
  {
   return MakeSureDirectoryPathExists(name);
  }
        /// <summary>
        /// 目录是否存在
        /// </summary>
        /// <param name="folderPath"></param>
        /// <returns></returns>
        public static bool FolderExists(string folderPath) {
            return System.IO.Directory.Exists(folderPath);
        }
        #endregion

        #region FileExists/DelAllFile/DelFile/GetAllFile/BackupFile
        /// <summary>
  /// 返回文件是否存在
  /// </summary>
  /// <param name="filename">文件名</param>
  /// <returns>是否存在</returns>
  public static bool FileExists(string filename)
  {
   return System.IO.File.Exists(filename);
  }
        /// <summary>
        /// 删除指定目录下的所有文件
        /// </summary>
        /// <param name="path"></param>
        public static void DelAllFile(string path) {
            DirectoryInfo Folder = new DirectoryInfo(path);
      FileInfo[] subFiles = Folder.GetFiles();
      for (int j = 0; j < subFiles.Length; j++) {
                subFiles[j].Delete();
            }
        }
        /// <summary>
        /// 删除指定文件
        /// </summary>
        /// <param name="filePath"></param>
        public static void DelFile(string filePath) {
            if (FileExists(filePath)) System.IO.File.Delete(filePath);
        }
        /// <summary>
        /// 取指定目录下的所有文件名
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static StringBuilder GetAllFile(string path) {
            StringBuilder fileList = new StringBuilder();
            try {
                DirectoryInfo Folder = new DirectoryInfo(path);
                FileInfo[] subFiles = Folder.GetFiles();
                for (int j = 0; j < subFiles.Length; j++) {
                    fileList.Append(subFiles[j].Name + "|");
                }
            } catch { }
            return fileList.Length.Equals(0) ? fileList : fileList.Remove(fileList.Length - 1, 1);
        }
        /// <summary>
        /// 取目录下的所有文件
        /// </summary>
        /// <param name="path"></param>
        /// <param name="fileList"></param>
        /// <param name="delStr"></param>
        public static void GetAllFile(string path,ref StringBuilder fileList, string delStr) {
            if (delStr.Equals("")) delStr = path;
            delStr = delStr.Substring(delStr.Length - 1).Equals("\\") ? delStr : delStr + "\\";
            string[] files = System.IO.Directory.GetFiles(path);
            foreach (string s in files) fileList.Append(s + "|").Replace(delStr,"");
            string[] dir = System.IO.Directory.GetDirectories(path);
            foreach (string s in dir) GetAllFile(s, ref fileList,delStr);
        }
        /// <summary>
        /// 备份文件
        /// </summary>
        /// <param name="sourceFileName"></param>
        /// <param name="destFileName"></param>
        /// <param name="overwrite"></param>
        /// <returns></returns>
        public static bool BackupFile(string sourceFileName, string destFileName, bool overwrite) {
            if (!File.Exists(sourceFileName)) return false;
            if (!overwrite && File.Exists(destFileName)) return false;

            try {
                File.Copy(sourceFileName, destFileName, true);
            } catch {
                return false;
            }
            return true;
        }
        #endregion
        /// <summary>
        /// 取文件编码
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static Encoding GetFileEncoding(string fileName) {
            /*byte[] Unicode=new byte[]{0xFF,0xFE};
            byte[] UnicodeBIG=new byte[]{0xFE,0xFF};
            byte[] UTF8=new byte[]{0xEF,0xBB,0xBF};*/

            try {
                FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                BinaryReader r = new BinaryReader(fs,System.Text.Encoding.Default);
                byte[] ss = r.ReadBytes(3);
                r.Close();
                fs.Close();
                fs.Dispose();

                if(ss[0]>=0xEF) {
                    if (ss[0]==0xEF && ss[1]==0xBB && ss[2]==0xBF)
                        return System.Text.Encoding.UTF8;
                    else if (ss[0]==0xFE && ss[1]==0xFF)
                        return System.Text.Encoding.BigEndianUnicode;
                    else if (ss[0]==0xFF && ss[1]==0xFE)
                        return System.Text.Encoding.Unicode;
                    else
                        return System.Text.Encoding.Default;
                } else return System.Text.Encoding.Default;
            } catch {
                return System.Text.Encoding.Default;
            }
        }

        public static void GZipCompress(string inFilename, string outFilename) {
            FileStream sourceFile = File.OpenRead(inFilename);
            FileStream destFile = File.Create(outFilename);
            GZipStream compStream = new GZipStream(destFile, CompressionMode.Compress);
            int theByte = sourceFile.ReadByte();

            while (theByte != -1) {
                compStream.WriteByte((byte)theByte);
                theByte = sourceFile.ReadByte();
            }

            sourceFile.Close();
            compStream.Close();
            destFile.Close();
        }

        public static void GZipDecompress(string inFileName, string outFileName) {
            FileStream sourceFile = File.OpenRead(inFileName);
            FileStream destFile = File.Create(outFileName);
            GZipStream compStream = new GZipStream(sourceFile, CompressionMode.Decompress);
            int theByte = compStream.ReadByte();

            while (theByte != -1) {
                destFile.WriteByte((byte)theByte);
                theByte = compStream.ReadByte();
            }

            destFile.Close();
            compStream.Close();
            sourceFile.Close();
        }

        public static long GetDirectorySize(string path) {
            long size = 0;
            string[] files = System.IO.Directory.GetFiles(path);
            foreach (string s in files) size += new FileInfo(s).Length;
            string[] dir = System.IO.Directory.GetDirectories(path);
            foreach (string s in dir) size += GetDirectorySize(s);
            return size;
        }

        public static long GetFileSize(string path) {
            if (!FileExists(path)) return 0;
            return new FileInfo(path).Length;
        }
    }
}