ASP.NET MVC中下载方式

1. PDF下载：return File(_pdfFilePath, "text/plain", Url.Encode(downName));
2. Excel下载：return File(ms, "application/ms-excel", Url.Encode(downName));
3. Word下载：return File(ms, "application/ms-word", Url.Encode(downName));

（说明：_pdfFilePath表示文件路径，downName表示下载文件名称；ms = new MemoryStream();）