c# 压缩文件

1、首先下载：ICSharpCode.SharpZipLib.dll
2、代码：
 /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="fileName">要压缩的所有文件（完全路径)</param>
        /// <param name="name">压缩后文件路径</param>
        /// <param name="Level">压缩级别</param>
        public void ZipFileMain(string filenames, string name)
        {
            ZipOutputStream s = new ZipOutputStream(File.Create(name));
            Crc32 crc = new Crc32();
            try
            {

                //打开压缩文件
                FileStream fs = File.OpenRead(filenames);

                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);

                //建立压缩实体
                ZipEntry entry = new ZipEntry(System.IO.Path.GetFileName(filenames));

                //时间
                entry.DateTime = DateTime.Now;
                //空间大小
                entry.Size = fs.Length;
                fs.Close();
                crc.Reset();
                crc.Update(buffer);
                entry.Crc = crc.Value;
                s.PutNextEntry(entry);
                s.Write(buffer, 0, buffer.Length);

            }
            catch
            {
                throw;
            }
            finally
            {
                s.Finish();
                s.Close();
            }

        }
    }