Ajax得到服务器生成的文件流，下载

前台：

       var downloadFrame;

        function doHisRPTDownload() {

            var period = $("#" + "<%=MonthSelect.ClientID %>").val();

            // Check to be sure this async postback is actually requesting the file download.    

            if (!downloadFrame) {

                downloadFrame = document.createElement("iframe");

                // Add the IFRAME to the page.  This will trigger a request to GenerateFile now.       

                document.body.appendChild(downloadFrame);

                // This makes the IFRAME invisible to the user.       

                downloadFrame.style.display = "none";

            }

            // Point the IFRAME to GenerateFile, with the desired region as a querystring argument.   

            downloadFrame.src = "AjaxPage/WebAjaxExportHisRPT.aspx?period=" + period;

            setTimeout("downloadFrame.src=''", 6000);

        }

 

后台：

public void GenerateXLS(DataTable dt, string fileName, string sheetName, int[] colWidth, int[]colWidthCriteria, string selectionCriteria)

        {

            byte[] fileData = nrpt.GetMemoryStream(dt, sheetName, colWidth, colWidthCriteria,selectionCriteria).ToArray();

            this.Response.Clear();

            this.Response.ContentEncoding = System.Text.Encoding.Default;

            this.Response.ContentType = "application/vnd.ms-excel"; // "application/octet-stream"; //"application/ms-excel"; //vnd.

            this.Response.AppendHeader("content-disposition", "attachment; filename=" +HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8).Replace("+", "%20"));

            this.Response.OutputStream.Write(fileData, 0, fileData == null ? 0 : fileData.Length);

            this.Response.Flush();

            this.Response.End();

}