最简单的压缩代码

 

        static string InFilePath = @"C:\Documents and Settings\wuy\桌面\新建 文本文档.txt";
        static string OutFilePath = @"C:\Documents and Settings\wuy\桌面\新建 文本文档.zip";

        private void button1_Click(object sender, EventArgs e)
        {
            FileInfo file = new FileInfo(InFilePath);
            Crc32 crc = new Crc32();
            ZipOutputStream ou=new ZipOutputStream(File.Create(OutFilePath));
            ou.SetLevel(9);    //压缩等级，越第越大   0~9;

            FileStream fs = File.OpenRead(InFilePath);
            Byte[] buffer = new byte[file.Length];
            fs.Read(buffer, 0, buffer.Length);
            ZipEntry entry = new ZipEntry("aa.txt");  //压缩后的文件属性
            //entry.DateTime = DateTime.Now;
            //entry.Size = fs.Length;
            fs.Close();
            //crc.Reset();                              //内存算法,基本没用
           // crc.Update(buffer);
            //entry.Crc = crc.Value;
            ou.PutNextEntry(entry);
            ou.Write(buffer, 0, buffer.Length);
            ou.Finish();
            ou.Close();
        }