使用OpenXML在内存中发送电子邮件附件

Question

我有一个使用OpenXML 2构建的Excel文件,我想将其作为电子邮件附件发送.例如

    System.IO.MemoryStream stream = new System.IO.MemoryStream();
    SpreadsheetDocument package = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook))
    AddParts(package); //created using document reflector

使用将电子表格保存到临时文件

stream.WriteTo(new System.IO.FileStream(@"c:\test.xlsx", System.IO.FileMode.Create));

工作良好.但是尝试直接将流作为电子邮件附件发送失败 - 当我这样做时,只需在电子邮件中附加一个空文件

System.Net.Mail.Attachment file = new System.Net.Mail.Attachment(stream, "MobileBill.xlsx", "application/vnd.ms-excel");

有人知道怎么做吗？

Answer 1

好吧,我通过一些努力得到了这个.要创建流:

MemoryStream stream = new MemoryStream();

using (SpreadsheetDocument package = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook))
{
  Excel.CreateSpreadsheet(package, Excel_Methods.CreateSpotQuoteOut(), true);
}

stream.Seek(0, SeekOrigin.Begin);

System.Net.Mail.Attachment attach = new System.Net.Mail.Attachment(stream, "spreadsheet.xlsx");

attach.ContentDisposition.CreationDate = DateTime.Now;
attach.ContentDisposition.ModificationDate = DateTime.Now;
attach.ContentDisposition.Inline = false;
attach.ContentDisposition.Size = stream.Length;
attach.ContentType.MediaType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; 

另外,我发现在创建它之后没有立即发送我的,并且其原因是"standalone = yes"没有被添加到所有页面的xml声明中,所以在我的AddParts函数中,添加了部分之后,我把它们传递给了这个函数:

private static void AddXMLStandalone(OpenXmlPart part)
        {
            System.IO.StreamWriter writer = new System.IO.StreamWriter(part.GetStream());

            XmlDocument doc = new XmlDocument();
            doc.Load(part.GetStream());

            doc.InnerXml = doc.InnerXml.Substring(doc.InnerXml.IndexOf("?>") + 2);
            doc.InnerXml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" + doc.InnerXml;

            part.GetStream().SetLength(doc.InnerXml.Length);
            doc.Save(writer);
            writer.Flush();
            writer.Close();            
        }

祝好运!

Answer 2

考虑负载：附件类是否希望从提供的流中的当前位置读取？如果是这种情况，您可能必须“寻找”回到流的开头，然后再将其提供给附件构造函数：

AddParts(package); //created using document reflector
stream.Seek(0, SeekOrigin.Begin);
System.Net.Mail.Attachment file = new System.Net.Mail.Attachment(stream, "MobileBill.xlsx", "application/vnd.ms-excel");