using System.IO;using System.Windows.Forms;using ICSharpCode.SharpZipLib.Zip;using ICSharpCode.SharpZipLib.Checksums;   public void unZip(string strSouceFile, string strDestFile)        {            if (!Directory.Exists(strDestFile))                Directory.CreateDirectory(strDestFile);            using (ZipInputStream zip = new ZipInputStream(File.OpenRead(strSouceFile)))            {                ZipEntry theEntry;                string fileName;                FileStream streamWriter;                while ((theEntry = zip.GetNextEntry()) != null)                {                    fileName = Path.GetFileName(theEntry.Name);                    if (fileName != String.Empty)                    {                        streamWriter = new FileStream(strDestFile + fileName, FileMode.Create, FileAccess.Write, FileShare.Read | FileShare.Write);                        int size = 2048;                        byte[] data = new byte[2048];                        while (true)                        {                            size = zip.Read(data, 0, data.Length);                            if (size > 0)                            {                                streamWriter.Write(data, 0, size);                            }                            else                            {                                break;                            }                        }                        streamWriter.Close();                    }                }                MessageBox.Show("解压文件成功！

","提示",MessageBoxButtons.OK,MessageBoxIcon.Information); } } public void ZipFile(string strSouceFile, string strDestFile) { using (ZipOutputStream stream = new ZipOutputStream(File.Create(strDestFile))) { stream.SetLevel(5); byte[] buffer = new byte[0x1000]; ZipEntry entry = new ZipEntry(Path.GetFileName(strSouceFile)); entry.DateTime = DateTime.Now; stream.PutNextEntry(entry); using (FileStream stream2 = File.OpenRead(strSouceFile)) { int num; do { num = stream2.Read(buffer, 0, buffer.Length); stream.Write(buffer, 0, num); } while (num > 0); MessageBox.Show("压缩文件成功！

"); } stream.Finish(); stream.Close(); } }

须要引用的dll,下载下面页面的dll

http://download.csdn.net/detail/sky_cat/7236675