Jquery+asp.net实现Ajax方式文件下载实例代码

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 // Ajax 文件下载

    jQuery.download = function (url, data, method) {

        // 获取url和data

        if (url && data) {

            // data 是 string 或者 array/object

            data = typeof data == ‘string‘ ? data : jQuery.param(data);

            // 把参数组装成 form的  input

            var inputs = ‘‘;

            jQuery.each(data.split(‘&‘), function () {

                var pair = this.split(‘=‘);

                inputs += ‘<input type="hidden" name="‘ + pair[0] + ‘" value="‘ + pair[1] + ‘" />‘;

            });

            // request发送请求

            jQuery(‘<form action="‘ + url + ‘" method="‘ + (method || ‘post‘) + ‘">‘ + inputs + ‘</form>‘)

        .appendTo(‘body‘).submit().remove();

        };

    };

<img onclick=\"GetSrcFromSvc(‘" + name + "‘)\" src=\"" + imgurl + "\" //>

 $.download("http://localhost:2204/wx/Default.aspx", "img=" + url, ‘post‘);

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 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite下载超过

 400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。  ///指定被输出图像的地址

        string imgurl = Request.Form["img"];

        string FileName = Server.MapPath(imgurl);

        //   System.Drawing.Image img = System.Drawing.Image.FromFile(imgurl);

        //   MemoryStream ms = new System.IO.MemoryStream();

        //   img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

        //   img.Dispose();

        //   context.Response.ClearContent();

        //   context.Response.ContentType = "image/jpg";

        //   context.Response.BinaryWrite(ms.ToArray());

        //   //context.htm = htm&File(FileName);

        //   ////將buffer 中的stream全部送出

        //    context.Response.Flush();

        ////   context.Response.End();

        string filePath = Server.MapPath(imgurl);//路径 

        if (File.Exists(filePath))

        {

            FileInfo fileinfoo = new FileInfo(filePath);

            Response.ContentType = "application/x-zip-compressed";

            Response.AddHeader("Content-Disposition", "attachment;filename=" + fileinfoo.Name + "");

            Response.TransmitFile(filePath);

        }

        else

        {

            htm = htm&("未找到文件。");

        }

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     string imgurl = Request.Form["img"];

        string FileName = Server.MapPath(imgurl);

        if (File.Exists(FileName))

        {

            FileInfo fileinfoo = new FileInfo(FileName);

            //以字符流的形式下载文件

            FileStream fs = new FileStream(FileName, FileMode.Open);

            byte[] bytes = new byte[(int)fs.Length];

            fs.Read(bytes, 0, bytes.Length);

            fs.Close();

            Response.ContentType = "application/octet-stream";

            //通知浏览器下载文件而不是打开

            Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileinfoo.Name, System.Text.Encoding.UTF8));

            Response.BinaryWrite(bytes);

            Response.Flush();

            Response.End();

        }