Question

尝试将一些数据从MemoryStream写入两个目标。首先，我将Xml对象写入内存流，然后从内存流写入Mail Attachment和Zip对象。尽管在每个步骤之间进行了Flush和Rewind，但只有第二个目标才能获取数据。我该如何解决这个问题？

这是我的来源：

using (Stream XmlPartStream = new MemoryStream())
using (XmlTextWriter XmlPartWriter = new XmlTextWriter(XmlPartStream, Encoding.Unicode))
{
    XDocument TheXInvoice = TheInvoice.XInvoice(dtInvoiceLines);
    XmlPartWriter.Formatting = Formatting.Indented;//xml output will be pretty-printed
    TheXInvoice.WriteTo(XmlPartWriter);//write to the MemoryStream
    XmlPartWriter.Flush();//finish writing to MemoryStream

    XmlPartStream.Seek(0, SeekOrigin.Begin);//rewind stream (Position=0 would also work)
    Attachment XmlPart = new Attachment(XmlPartStream, InvoiceXmlName, "application/xml");
    TheMail.Attachments.Add(XmlPart);
    XmlPartStream.Flush();//finish writing from MemoryStream to Attachment
    // BUG: no bytes in the Attachment

    XmlPartStream.Seek(0, SeekOrigin.Begin);//rewind stream (Position=0 would also work)
    byte[] ZippedXml = LempelZiv.GZip(XmlPartStream);
    // OK: Entire XML in the ZippedXml

更新

感谢评论员rinukkusu，我尝试先邮寄，然后拉链。现在一切正常。显然，Mail没有Flush功能，它实际上会延迟读取其字节......

Answer 1

尝试在第一个XmlPartWriter.Close()之后调用Flush。

Stream Flush不起作用，将MemoryStream写入两个目的地

1 个答案: