ZipFile zip = new ZipFile();
zip.AddFile("c:\\666.txt");
MemoryStream output = new MemoryStream();
zip.Save(output);
byte[] zipbytes = output.ToArray();
FileStream fs = File.OpenWrite("c:\\666.zip");
fs.Write(zipbytes, 0, zipbytes.Length);
fs.Close();
Dll下载地址:http://files.cnblogs.com/ycdx2001/Ionic.Zip.Reduced.rar
压缩文件
原文：http://my.oschina.net/robortly/blog/514597
