如何使在网页上生成的文件可供用户下载?
本文关键字:文件 用户 下载 何使 网页 | 更新日期: 2023-09-27 18:04:03
这个问题与我在这里问的一个问题有关:"我如何提示用户从Sharepoint页面输入保存位置?"
我需要做的是,在生成PDF之后:
private void GeneratePDF(List<ListColumns> listOfListItems)
{
. . .
//Create a stream that we can write to, in this case a MemoryStream
StringBuilder sb = new StringBuilder();
using (var ms = new MemoryStream())
{
using (var doc = new Document(PageSize.A4, 25, 25, 10, 10))
{
//Create a writer that's bound to our PDF abstraction and our stream
using (var writer = PdfWriter.GetInstance(doc, ms))
{
//Open the document for writing
doc.Open();
Paragraph docTitle = new Paragraph("UCSC - Direct Payment Form", timesBold16UCSCBlue);
doc.Add(docTitle);
Paragraph subTitle = new Paragraph("(Not to be used for reimbursement of services)", timesRoman9Font);
subTitle.IndentationLeft = 20;
doc.Add(subTitle);
. . . // tons of iTextSharp PDF-generation code elided for brevity
String htmlToRenderAsPDF = sb.ToString();
//XMLWorker also reads from a TextReader and not directly from a string
using (var srHtml = new StringReader(htmlToRenderAsPDF))
{
XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, srHtml);
}
doc.Close();
}
}
try
{
var bytes = ms.ToArray();
// This is currently saved to a location on the server such as C:'Users'TEMP.SP.005'Desktop'iTextSharpTest.pdf (but the number (such as
"005" irregularly increments))
String pdfFileID = GetYYYYMMDDAndUserNameAndAmount();
String pdfFileName = String.Format("DirectPayDynamic_{0}.pdf", pdfFileID);
String fileFullpath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), pdfFileName);
String fileLinkBase = "Generated PDF: <a href='"{0}'">{1}</a>";
String filelink = String.Format(fileLinkBase, fileFullpath, pdfFileName);
File.WriteAllBytes(fileFullpath, bytes);
var pdflink = new Label
{
CssClass = "finaff-webform-field-label",
Text = filelink
};
this.Controls.Add(pdflink);
}
catch (DocumentException dex)
{
throw (dex);
}
catch (IOException ioex)
{
throw (ioex);
}
catch (Exception ex)
{
throw (ex);
}
}
} // GeneratePDF
…为用户提供将该文件保存到本地机器的机会(目前,它被保存在服务器上)。
现在,我要做的就是替换这一行:
String fileFullpath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), pdfFileName);
…例如:
String fileFullpath = "Hey, bloke (or blokette), where do you want to save this?"
这显然是可能的,甚至有些常见,因为许多网站会为您生成文件,然后允许您保存这些
生成文件到您选择的位置或默认位置,例如下载文件夹。
服务器端(c#)或客户端(jQuery)解决方案都是可以接受的,尽管我更喜欢服务器端,因为这是生成PDF的地方。
当我必须强制将Excel电子表格下载到客户端时,我使用了以下代码,它可能会指向您想要获取的位置:
控件xxx类型为'LinkButton'必须放置在带有runat=server
的表单标签中protected void ExportExcelFile(object Sender, EventArgs e) { //export to excel
var grdResults = new DataGrid(); // REF: https://stackoverflow.com/q/28155089/153923
if (periodCriteria.SelectedValue == "year") {
grdResults = RollupDG;
} else {
grdResults = QuarterDG;
}
var response = HttpContext.Current.Response;
response.Clear();
response.Charset = String.Empty;
response.ContentType = "application/vnd.ms-excel";
response.AddHeader("Content-Disposition", "attachment; filename=GlBudgetReport.xls");
using (var sw = new StringWriter()) {
using (var htw = new HtmlTextWriter(sw)) {
grdResults.RenderControl(htw);
response.Write(sw.ToString());
response.End();
}
}
}