使用 ClosedXML 下载文件

Question

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我如何下载文件以便用户看到它正在下载（就像使用流一样？）

我目前使用的是ClosedXML，但是如果我使用SaveAs方法，我必须给出一个硬编码的URL，如果我只是给出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，但是我必须创建我自己的基于 HTML 的 excel 文件，并且文件变得太大了，当我使用 ClosedXML 时，文件只有 50% 或更少以下代码的大小： 但是，下载行为是我想要的。

有没有办法可以转换下面的代码，以便我可以将我的“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

如果您使用 MVC，只需使用 File() 方法，如下所示：

using (XLWorkbook wb = new XLWorkbook())
 {
  //here you put your data in the WorkBook
  //then create a Memory Stream object
using (MemoryStream stream = new MemoryStream())
  {
   //save the workbook as a MemoryStream
     wb.SaveAs(stream);

   //use the File method to return a File
   return File(stream.ToArray(), "filetype","fileName.extension");
   }
 }

Answer 2

如果使用 Asp.Net MVC，基本相同，但稍微整洁一些（我是这么认为的:)）。

public ActionResult DownloadFile(XXXModel model)
{
    using (var workbook = new XLWorkbook(XLEventTracking.Disabled))
    {
        // create worksheets etc..

        // return 
        using (var stream = new MemoryStream())
        {
            workbook.SaveAs(stream);
            stream.Flush();

            return new FileContentResult(stream.ToArray(),
                   "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
                   {
                       FileDownloadName = "XXXName.xlsx"
                   };
        }
    }

Answer 3

//Method for Export Excel using Closed Xml
public void ExportDataWithClosedXml_Method(DataTable table, string tabName, string fileType)
{
    var workbook = new XLWorkbook();
    var ws = workbook.Worksheets.Add(table, tabName);
    int row = 2 + table.Rows.Count;
    int col = table.Columns.Count;
    var redRow = ws.Row(1);
    //redRow.Style.Fill.BackgroundColor = XLColor.Red;
    redRow.InsertRowsAbove(1);
    ws.Cell(1, 1).Value = "Name of Report Type";
    ws.Cell(1, 1).Style.Font.Bold = true;
    ws.Table(0).ShowAutoFilter = false;
    //ws.Row(2).Style.Fill.BackgroundColor = XLColor.Red;
    ws.Range(2, 1, 2, col).Style.Fill.BackgroundColor = XLColor.Green;
    ws.Range(2, 1, 2, col).Style.Font.Bold = true;
    ws.Range(3, 1, row, col).Style.Font.Italic = true;

    HttpContext.Current.Response.Clear();
    using (MemoryStream memoryStream = new MemoryStream())
    {
        workbook.SaveAs(memoryStream);
        memoryStream.WriteTo(HttpContext.Current.Response.OutputStream);
        memoryStream.Close();
    }
    if (fileType == "xlsx")
    {
        HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=\"Samplefile.xlsx\"");
    }
    else
    {
        HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
        HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=\"Samplefile.xls\"");
    }
    HttpContext.Current.Response.End();
}

Answer 4

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

    // Send the file
    MemoryStream excelStream = new MemoryStream();
    workbook.SaveAs(excelStream);
    excelStream.Position = 0;
    return File(excelStream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "MyFileName.xlsx");
}

Answer 5

下载可以更简单、更短一些，因此控制器中的完整操作可能如下所示 - 下载部分只是一行而不是七到十行

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" };
}

Answer 6

旧线程，但我无法让公认的解决方案正常工作。更多的搜索提出了这个，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 7

SaveAs() 方法支持流，所以要获取 ClosedXml 工作簿作为我使用的流：

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();