asp.net – 通过调用.ashx页面下载文件

$.ajax({
            type: "POST",url: "FileDownload.ashx",dataType: "html",success: function (data) { }
        }
        );


     public class FileDownload : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        //context.Response.ContentType = "text/plain";
        //context.Response.Write("Hello World");

        string fileName = "BUSProjectCard.pdf";
        string filePath = context.Server.MapPath("~/Print/");
        context.Response.Clear();
        context.Response.ContentType = "application/pdf";
        context.Response.AddHeader("Content-Disposition","attachment; filename=" + fileName);
        context.Response.TransmitFile(filePath + fileName);
        context.Response.End();
    }