C # Compression Decompression helper class

Using System;  Using System.Collections.Generic;  Using System.IO;  Using System.Linq;  Using System.Web;     Using ICSharpCode.SharpZipLib.Zip; Namespace GzRMIS.Main.Business {public class Ziphelper {///// The absolute path of the file to be compressed //Private List
 
  absolutepaths {set; get;}             public string ErrorMsg {set; get;}              Public Ziphelper () {errormsg = ""; absolutepaths = new List
  
   (); }          ///
   ///Add compressed files or Folders//////
   Absolute path to a file or folderpublic void AddFile (string _fileabsolutepath) {Absolutepaths.add (_fileabsolutepath); }          ///
   ///Compressed files or Folders//////
   Compressed file storage path, such as C:\\windows\abc.zip///
   Compression level 0~9, the larger the number, the higher the compression rate, the default is 5///
   
    
             public bool Compressionzip (string _depositpath,int _level=5) {bool result = true;              FileStream fs = null;                  try {zipoutputstream comstream = new Zipoutputstream (File.create (_depositpath));      Comstream.setlevel (_level);                      Compression level foreach (string path in absolutepaths) {//If it is a directory                      if (directory.exists (path)) {Zipfloder (path, comstream, path);                          } else if (file.exists (path))//if the file {                          FS = File.openread (path); byte[] BTS = new BYTE[FS.                          Length]; Fs. Read (BTS, 0, BTS.                          Length); ZipEntry ze = new ZipEntry (new FileInfo (path).                          Name);             Comstream.putnextentry (Ze);           Provide a container for compressed file streams               Comstream.write (BTS, 0, BTS.  Length); Write Bytes}} comstream.finish ();              End compression Comstream.close ();                      } catch (Exception ex) {if (fs! = NULL) { Fs.                  Close (); } errormsg = ex.                  Message;              result = false;          } return result;          }//Compressed folder private void Zipfloder (String _ofloderpath, Zipoutputstream Zos, String _floderpath) {foreach (FileSystemInfo item in New DirectoryInfo (_floderpath). Getfilesysteminfos ()) {if (directory.exists) (item. FullName) {Zipfloder (_ofloderpath, Zos, item.                  FullName); } else if (File.exists (item. FullName)//If the file is {DirectoryInfo ODir = new DirEctoryinfo (_ofloderpath); String fullName2 = new FileInfo (item. FullName).                      FullName;                      String path = Odir.name + fullname2.substring (ODir.FullName.Length, fullname2.length-odir.fullname.length);//Get relative directory                      FileStream fs = File.openread (fullName2); byte[] BTS = new BYTE[FS.                      Length]; Fs. Read (BTS, 0, BTS.                      Length);                      ZipEntry ze = new ZipEntry (path); Zos.             Putnextentry (Ze); Provides a container zos for compressed file streams. Write (BTS, 0, BTS.  Length);  Write Bytes}}}///
   /// unzip /////
   Compressed file path///
   Unzip the path///
   
    
             public bool Decompressionzip (string _depositpath, String _floderpath) {bool result = True              ;              FileStream fs = null;                  try {zipinputstream inpstream = new Zipinputstream (File.openread (_depositpath)); ZipEntry ze = inpstream.getnextentry ();//get each file in a compressed file Directory.CreateDirectory (_floderpath);//Create Unzip the folder while (ze! = null)//If ze is finished, it is null {if (ze. Isfile)//compressed zipinputstream is stored in the file. The file name with the folder is the folder \ \ filename {string[] STRs = ze. Name.split (' \ \ ');//If the file name contains ' \ \ ' It indicates a folder if (STRs. Length > 1) {//two layer loop for layer one layer create folder for (int i = 0; i < STRs. Length-1;                             i++) {string floderpath = _floderpath;     for (int j = 0; J < i; J + +) {Floderpath = f                                  Loderpath + "\" + strs[j];                                  } Floderpath = Floderpath + "\ \" + strs[i];                              Directory.CreateDirectory (Floderpath); }} fs = new FileStream (_floderpath + "\ \" + Ze. Name, FileMode.OpenOrCreate, FileAccess.Write);//create File//loop to read file to file stream Whil                              E (True) {byte[] BTS = new byte[1024]; int i = Inpstream.read (BTS, 0, BTS.                              Length); if (i > 0) {fs.                              Write (BTS, 0, I);                              } else {    Fs.                                  Flush (); Fs.                                  Close ();                              Break                  }}} ze = Inpstream.getnextentry ();                      }} catch (Exception ex) {if (fs! = NULL) { Fs.                  Close (); } errormsg = ex.                  Message;              result = false;          } return result; }         }  }
  
 

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