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System.IO.FileInfo fi = new FileInfo("file.pdf");
Response.AddHeader("content-disposition", "attachment; filename=" + HttpUtility.UrlEncode(fi.Name));
Response.AddHeader("Content-Type", "application/octet-stream");
Response.AddHeader("Content-Length", fi.Length.ToString());
Response.WriteFile(fi.FullName);
Response.End();
<a href="http://www.xxxx.com/web/files/xxxx.pdf">下载</a>