带有MemoryStream的EPPlus作为电子邮件附件 - 文件为空

Question

我正在构建一个控制台应用程序，将数据移动到excel文件中（使用EPPlus库）。我将ExcelPackage保存为MemoryStream，我想将其附加到电子邮件中。但是，当我收到电子邮件时，Excel文件为空 - 0字节。

思想？

        MemoryStream outputStream = new MemoryStream();
        using (ExcelPackage package = new ExcelPackage(outputStream)) {

                // export each facility's rollup and detail to tabs in Excel (two tabs per facility)
                ExcelWorksheet facilityWorksheet = package.Workbook.Worksheets.Add(row["facility_id"].ToString());
                ExcelWorksheet facilityDetail = package.Workbook.Worksheets.Add(row["facility_id"].ToString() + "-detail");

                facilityWorksheet.Cells.LoadFromDataTable(rollupData, true);
                facilityDetail.Cells.LoadFromDataTable(rawExceptions, true);

                package.Save();
        }

以下是创建电子邮件附件的代码：

Attachment attachment = new Attachment(outputStream, "ECO_exceptions.xlsx", "application/vnd.ms-excel");

Answer 1

经过一番搜索，我找到了解决方案。显然我需要在将MemoryStream作为附件传递之前显式设置它的起始位置。以下代码行完成了这个诀窍：

outputStream.Position = 0;