使用Deflate算法对文件进行压缩与解压缩的方法详解

如下所示：

        static void main()
        {
            string path = @"d:\practise\io\compress";
            string decompresspath = @"d:\practise\io\decompress";
            directoryinfo dir = new directoryinfo(path);
            foreach (fileinfo fi in dir.getfiles())
            {
                compress(fi);
            }
            foreach (fileinfo fi in dir.getfiles("*.cmp"))
            {
                decompress(fi, decompresspath);
            }
        }
        public static void compress(fileinfo fi)
        {
            using (filestream fs = fi.openread())
            {
                if (fi.attributes != fileattributes.hidden & fi.extension != ".cmp")
                {
                    using (filestream compressfile = new filestream(fi.fullname + ".cmp", filemode.create, fileaccess.readwrite))
                    {
                        using (deflatestream ds = new deflatestream(compressfile, compressionmode.compress))
                        {
                            fs.copyto(ds);
                            console.writeline("this file {0} has been compressed to {1}",fi.name,compressfile.name);
                        }
                    }
                }
            }
        }
        public static void decompress(fileinfo fi, string desination)
        {
            using (filestream fs = fi.openread())
            {
                string decompressfile = fi.name.remove(fi.name.length - fi.extension.length);
                using (filestream decompressfs = new filestream(path.combine(desination, decompressfile), filemode.create, fileaccess.readwrite))
                {
                    using (deflatestream ds = new deflatestream(fs, compressionmode.decompress))
                    {
                        ds.copyto(decompressfs);
                        console.writeline("this file {0} has been decompressd", fi.name);
                    }
                }
            }
        }