asp.net中的文件处理程序

创建一个ASHX(比aspx onload事件更快)页面,将文件的id作为查询字符串传递以跟踪每次下载

 public class FileDownload : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
        {
            //Track your id
            string id = context.Request.QueryString["id"];
            //save into the database 
            string fileName = "YOUR-FILE.pdf";
            context.Response.Clear();
            context.Response.ContentType = "application/pdf";
            context.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
            context.Response.TransmitFile(filePath + fileName);
            context.Response.End();
           //download the file
        }

在你的html中应该是这样的

<a href="/GetFile.ashx?id=7" target="_blank">

或

window.location = "GetFile.ashx?id=7";

但我更愿意坚持链接解决方案。

以下是自定义HttpHandler的一个选项,该选项使用PDF的常规锚标记:

创建ASHX(右键单击项目->添加新项目-<通用处理程序)

using System.IO;
using System.Web;

namespace YourAppName
{
    public class ServePDF : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            string fileToServe = context.Request.Path;
            //Log the user and the file served to the DB
            FileInfo pdf = new FileInfo(context.Server.MapPath(fileToServe));
            context.Response.ClearContent();
            context.Response.ContentType = "application/pdf";
            context.Response.AddHeader("Content-Disposition", "attachment; filename=" + pdf.Name);
            context.Response.AddHeader("Content-Length", pdf.Length.ToString());
            context.Response.TransmitFile(pdf.FullName);
            context.Response.Flush();
            context.Response.End();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

编辑web.config以将处理程序用于所有PDF:

<httpHandlers>
    <add verb="*" path="*.pdf" type="YourAppName.ServePDF" />
</httpHandlers>

现在,到PDF的常规链接将使用您的处理程序来记录活动并提供文件

<a href="/pdf/Newsletter01.pdf">Download This</a>