首先有一個html頁面，頁面有一個連結，點選連結彈出檔案下載/儲存(類似迅雷下載連結)
<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>檔案下載</title> <meta charset="utf-8" /></head><body> <!--該方式不行，1：如果訪問的是類似文本等瀏覽器可以處理的檔案，則是瀏覽器開啟顯示的方式，並不是檔案下載；2：如果訪問的是App_Data檔案夾裡的檔案，由於.net的機制不允許訪問App_Data檔案夾資源，所以會報“要求篩選模組被配置為拒絕包含 hiddenSegment 節的 URL 中的路徑。”--> <a href="App_Data/readme.txt" rel="external nofollow" >下載readme.txt檔案</a> <br /> <a href="DownloadFileHandler.ashx" rel="external nofollow" >下載readme.txt檔案</a></body></html>
一般處理常式的代碼如下
using System.IO;using System.Web;namespace Zhong.Web{ /// <summary> /// DownloadFileHandler 的摘要說明 /// </summary> public class DownloadFileHandler : IHttpHandler { public void ProcessRequest(HttpContext context) { string filePath = context.Server.MapPath("~/App_Data/readme.txt"); FileStream fs = new FileStream(filePath, FileMode.Open); byte[] bytes = new byte[fs.Length]; fs.Read(bytes, 0, bytes.Length); fs.Dispose(); context.Response.ContentType = "application/octet-stream"; context.Response.AddHeader("Content-Disposition", "attachment; filename=readme.txt"); context.Response.BinaryWrite(bytes); context.Response.Flush(); //大檔案下載的解決方案 //context.Response.ContentType = "application/x-zip-compressed"; //context.Response.AddHeader("Content-Disposition", "attachment;filename=z.zip"); //string filename = Server.MapPath("~/App_Data/move.zip"); //context.Response.TransmitFile(filename); } public bool IsReusable { get { return false; } } }}
點擊第一個連結訪問，顯示如下：
點擊第二個連結訪問，下載檔案：
由於我之前已經測試過一次，所以這次下載時命名為readme(1).txt
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