openXML电子表格文档返回用于MVC文件下载的字节数组

我试图以 byte[] 的形式返回一个 openXML 电子表格文档，然后我可以使用它来允许我的 MVC 将该文件发送给用户。这是我的电子表格文档方法返回字节数组

using (MemoryStream mem = new MemoryStream())
{
    SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.
        Create(mem, SpreadsheetDocumentType.Workbook);

    // Add a WorkbookPart to the document.
    WorkbookPart workbookpart = spreadsheetDocument.AddWorkbookPart();
    workbookpart.Workbook = new Workbook();

    // Add a WorksheetPart to the WorkbookPart.
    WorksheetPart worksheetPart = workbookpart.AddNewPart<WorksheetPart>();
    worksheetPart.Worksheet = new Worksheet(new SheetData());

    // Add Sheets to the Workbook.
    Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.
        AppendChild<Sheets>(new Sheets());

    SheetData sheetData = worksheetPart.Worksheet.GetFirstChild<SheetData>();

    //row start
    for (int id = 0; id <= reports.Count(); id++)
    {
        if (id == 0)
        {
            Row contentRow = CreateContentRow(reports.ElementAt(id), true, 2 + id);
            sheetData.AppendChild(contentRow);
        }
        else
        {
            Row contentRow = CreateContentRow(reports.ElementAt((id - 1)), false, 2 + id);
            sheetData.AppendChild(contentRow);
        }
    }

    // Append a new worksheet and associate it with the workbook.
    Sheet sheet = new Sheet()
    {
        Id = spreadsheetDocument.WorkbookPart.
            GetIdOfPart(worksheetPart),
        SheetId = 1,
        Name = "mySheet"
    };
    sheets.Append(sheet);
    workbookpart.Workbook.Save();
    return mem.ToArray();
}

然后在我的 MVC 控制器中我这样称呼它

return File(crs.CreateReportSpreadSheet(reports),"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Reports.xlsx");

该文件已下载，但当您打开时，它会显示一条错误消息，表明该文件已损坏。有没有其他方法可以让他们下载这个文件？

我知道这已经晚了，但我相信这是因为您在完成电子表格文档后没有关闭它。确保在返回内存流以提交文档使用的所有底层流之前关闭文档。

// code omitted for clarity...
workbookpart.Workbook.Save();
spreadsheetDocument.Close();
return mem.ToArray()

http://msdn.microsoft.com/en-gb/library/documentformat.openxml.packaging.spreadsheetdocument(v=office.14).aspx