public static Stream CreateZip(List
     
       listPath, int level = 5){	MemoryStream mstream = new MemoryStream();	using (ZipOutputStream zipstream = new ZipOutputStream(mstream))	{		zipstream.SetLevel(level);		Crc32 crc = new Crc32();		foreach (var path in listPath)		{			FileStream fs = File.Open(path, FileMode.Open);			//重置流的位置			fs.Position = 0L;			byte[] buffer = new byte[fs.Length];			fs.Read(buffer, 0, buffer.Length);			//ZIP文件条目			ZipEntry entry = new ZipEntry(Path.GetFileName(path));			entry.DateTime = DateTime.Now;			entry.Size = fs.Length;			fs.Close();			crc.Reset();			crc.Update(buffer);			//冗余校验码			entry.Crc = crc.Value;			zipstream.PutNextEntry(entry);			zipstream.Write(buffer, 0, buffer.Length);		}		//ZipOutputStream关闭后不关闭mstream		zipstream.IsStreamOwner = false;	}	//重置流的位置	mstream.Position = 0L;	return mstream;}
     

使用流读取并压缩文件。

zipstream.IsStreamOwner = false;

必须设置

在MVC中使用FileStreamResult File(Stream fileStream, string contentType, string fileDownloadName)方法可直接下载。

contentType可使用"application/x-zip-compressed"表示zip文件类型。