How to compress or unzip files & folders in C#

There are so many free opensource tools out there that would achieve this functionality, but I feel ICSharpCode.SharpZipLib is the best in business. It gives you so much flexibility to zip/unzip folders/files with or without password protection. In this article, I would give you some samples that would cover wide range of situations.

Where can I download the assembly?

http://www.icsharpcode.net/opensource/sharpziplib/download.aspx

Example 1: How to zip a file?

Ziplib API provides a ZipOutputStream which we could use to achieve this.

public static void Zip(string SrcFile, string DstFile)
        {
            FileStream fileStreamIn = new FileStream(SrcFile, FileMode.Open, FileAccess.Read);
            FileStream fileStreamOut = new FileStream(DstFile, FileMode.Create, FileAccess.Write);
            ZipOutputStream zipOutStream = new ZipOutputStream(fileStreamOut);

            byte[] buffer = new byte[fileStreamIn.Length];

            ZipEntry entry = new ZipEntry(Path.GetFileName(SrcFile));
            zipOutStream.PutNextEntry(entry);

            int size;
            do
            {
                size = fileStreamIn.Read(buffer, 0, buffer.Length);
                zipOutStream.Write(buffer, 0, size);
            } while (size > 0);

            zipOutStream.Close();
            fileStreamOut.Close();
            fileStreamIn.Close();
        }

Example 2: How to zip a folder including all the files & subfolders?

public static void ZipFolders()
        {
            ICSharpCode.SharpZipLib.Zip.FastZip fz = new FastZip();
            fz.CreateZip(@"C:\Temp\zip\test.zip", @"C:\Temp\zip\test", true, "", "");
        }

Example 3: You want to add a new file to an existing zip, no problem

public static void AddFileToZip(string sourceFile, string zipFolderPath)
        {
            ZipFile zipFile = new ZipFile(zipFolderPath);

            zipFile.BeginUpdate();            
            zipFile.UseZip64 = UseZip64.On;
            zipFile.Add(sourceFile, Path.GetFileName(sourceFile));
                                    
            zipFile.CommitUpdate(); 
            zipFile.IsStreamOwner = true;            
            zipFile.Close();

        }

Example 4: lets cut to the chase. I don’t want o pay money to WINZIP for unzipped my folder.

public static void UnZip(string sourcePath, string targetPath)
        {            
            ICSharpCode.SharpZipLib.Zip.FastZip fz = new FastZip();
            fz.ExtractZip(sourcePath, targetPath, "");
            
        }

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