c#,zip,file,unzip,file,with,SharpZipLib

vincent 7/29/2016 0

this code will let you zip file via c#

C#
 using ICSharpCode.SharpZipLib.Core;
using ICSharpCode.SharpZipLib.Zip;

public void CreateSample(string outPathname, string folderName)
        {

            FileStream fsOut = File .Create(outPathname);
            ZipOutputStream zipStream = new ZipOutputStream (fsOut);

            zipStream.SetLevel(3); //0-9, 9 being the highest level of compression

            //zipStream.Password = password;  // optional. Null is the same as not setting. Required if using AES.

            // This setting will strip the leading part of the folder path in the entries, to
            // make the entries relative to the starting folder.
            // To include the full path for each entry up to the drive root, assign folderOffset = 0.
            int folderOffset = folderName.Length   (folderName.EndsWith( "\\") ? 0 : 1);

            CompressFolder(folderName, zipStream, folderOffset);

            zipStream.IsStreamOwner = true; // Makes the Close also Close the underlying stream
            zipStream.Close();
        }

 private void CompressFolder( string path, ZipOutputStream zipStream, int folderOffset)
        {

            string[] files = Directory.GetFiles(path);

            foreach ( string filename in files)
            {

                FileInfo fi = new FileInfo(filename);

                string entryName = filename.Substring(folderOffset); // Makes the name in zip based on the folder
                entryName = ZipEntry.CleanName(entryName); // Removes drive from name and fixes slash direction
                ZipEntry newEntry = new ZipEntry(entryName);
                newEntry.DateTime = fi.LastWriteTime; // Note the zip format stores 2 second granularity

                // Specifying the AESKeySize triggers AES encryption. Allowable values are 0 (off), 128 or 256.
                // A password on the ZipOutputStream is required if using AES.
                //   newEntry.AESKeySize = 256;

                // To permit the zip to be unpacked by built-in extractor in WinXP and Server2003, WinZip 8, Java, and other older code,
                // you need to do one of the following: Specify UseZip64.Off, or set the Size.
                // If the file may be bigger than 4GB, or you do not need WinXP built-in compatibility, you do not need either,
                // but the zip will be in Zip64 format which not all utilities can understand.
                //   zipStream.UseZip64 = UseZip64.Off;
                newEntry.Size = fi.Length;

                zipStream.PutNextEntry(newEntry);

                // Zip the file in buffered chunks
                // the "using" will close the stream even if an exception occurs
                byte[] buffer = new byte[4096];
                using ( FileStream streamReader = File .OpenRead(filename))
                {
                    StreamUtils.Copy(streamReader, zipStream, buffer);
                }
                zipStream.CloseEntry();
            }
            string[] folders = Directory.GetDirectories(path);
            foreach ( string folder in folders)
            {
                CompressFolder(folder, zipStream, folderOffset);
            }
        }
 

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