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 {//<summary>        The absolute path of the file to be compressed///</summary> private list<string> absolutepaths {set; get;}        public string ErrorMsg {set; get;}            Public Ziphelper () {errormsg = "";        Absolutepaths = new list<string> (); }///<summary>//Add compressed files or Folders///</summary>//<param name= "_fileabsolutepat H "> absolute path to file or folder </param> public void AddFile (string _fileabsolutepath) {Absolutepaths.add        (_fileabsolutepath); }///<summary>//Compressed files or Folders///</summary>//<param name= "_depositpath" > Compressed file storage path such as c:\\windows\abc.zip</param>//<param name= "_level" > Compression level 0~9, the higher the number of compression ratio,The default is 5</param>//<returns></returns> public bool Compressionzip (string _depositpath,int _l            EVEL=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.openre                        AD (path); byte[] BTS = new BYTE[FS.                        Length]; Fs. Read (BTS, 0, BTS.                        Length); ZipEntry ze = new ZipEntry (new FileInfo (path).                        Name);             Comstream.putnextentry (Ze); To compress filesThe stream provides a container 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 {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}}///<summary>//unzip//</summary>        <param name= "_depositpath" > Compressed file path </param>//<param name= "_floderpath" > unzipped path </param>        <returns></returns> 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 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 = FL                                Oderpath + "\" + strs[j]; } Floderpath =Floderpath + "\" + strs[i];                            Directory.CreateDirectory (Floderpath); }} fs = new FileStream (_floderpath + "\ \" + Ze. Name, FileMode.OpenOrCreate, FileAccess.Write);//create File//loop read file to file stream while (t                            Rue) {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; }}}<a target=_blank href= "http://icsharpcode.github.io/SharpZipLib/" target= "_blank" > ICSharpCode.SharpZipLib.Zip Download </a>

C # Compression Decompression helper class