使用ClosedXML下载文件

Question

所有

如何下载文件以便用户看到它正在下载(如使用流？)

我目前正在使用ClosedXML,但如果我使用SaveAs方法,我必须提供一个硬编码的URL,如果我只是给它文件名,它不会自动下载到下载文件夹.

下面的方法效果很好,但我必须创建自己的excel文件,该文件基于HTML,并且文件增长得太大,当我使用ClosedXML时,文件的大小只有50%或更少.代码如下:但是,下载行为是我希望它的样子.

有没有办法可以转换下面的代码,所以我可以把我的'工作簿'作为一个对象,它只是下载这个工作簿？

HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename=Excel.xls");
HttpContext.Current.Response.Charset ="UTF-8";    
HttpContext.Current.Response.ContentEncoding=System.Text.Encoding.Default;
HttpContext.Current.Response.ContentType = "application/ms-excel";
ctl.Page.EnableViewState =false;   
System.IO.StringWriter  tw = new System.IO.StringWriter() ;
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter (tw);
ctl.RenderControl(hw);
HttpContext.Current.Response.Write(tw.ToString());
HttpContext.Current.Response.End();

谢谢

Answer 1

该SaveAs()方法支持流,因此要将ClosedXml工作簿作为我使用的流获取:

public Stream GetStream(XLWorkbook excelWorkbook)
{
    Stream fs = new MemoryStream();
    excelWorkbook.SaveAs(fs);
    fs.Position = 0;
    return fs;
}

然后下载文件:

string myName = Server.UrlEncode(ReportName + "_" + DateTime.Now.ToShortDateString() + ".xlsx");
MemoryStream stream = GetStream(ExcelWorkbook);

Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=" + myName);
Response.ContentType = "application/vnd.ms-excel";
Response.BinaryWrite(stream.ToArray());
Response.End();

Answer 2

旧线程,但我无法让公认的解决方案正常工作.我想到了更多的搜索,这对我来说非常有用:

        // Create the workbook
        XLWorkbook workbook = new XLWorkbook();
        workbook.Worksheets.Add("Sample").Cell(1, 1).SetValue("Hello World");

        // Prepare the response
        HttpResponse httpResponse = Response;
        httpResponse.Clear();
        httpResponse.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        httpResponse.AddHeader("content-disposition", "attachment;filename=\"HelloWorld.xlsx\"");

        // Flush the workbook to the Response.OutputStream
        using (MemoryStream memoryStream = new MemoryStream())
        {
            workbook.SaveAs(memoryStream);
            memoryStream.WriteTo(httpResponse.OutputStream);
            memoryStream.Close();
        }

        httpResponse.End();

Answer 3

下载可以更简单,更短,因此控制器中的完整操作可能如下所示 - 下载部分只有一行而不是七行到十行

public ActionResult XLSX()
{
    System.IO.Stream spreadsheetStream = new System.IO.MemoryStream();
    XLWorkbook workbook = new XLWorkbook();
    IXLWorksheet worksheet = workbook.Worksheets.Add("example");
    worksheet.Cell(1, 1).SetValue("example");
    workbook.SaveAs(spreadsheetStream);
    spreadsheetStream.Position = 0;

    return new FileStreamResult(spreadsheetStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet") { FileDownloadName = "example.xlsx" };
}