我的应用会读取Gmail的附件。附件是一种XML文件(特别是.tcx)。当我将它们解码为MemoryStream时,我收到错误
XDocument.Load(stream):
System.Xml.XmlException
HResult=0x80131940
Message=Root element is missing.
Source=System.Private.Xml
StackTrace:
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
at System.Xml.Linq.XDocument.Load(Stream stream, LoadOptions options)
at System.Xml.Linq.XDocument.Load(Stream stream)
但是当我将它解码为FileStream时,一切都还可以。
失败的代码:
foreach (var attachment in message.Attachments)
{
var stream = new MemoryStream();
if (attachment is MessagePart rfc822)
{
rfc822.Message.WriteTo(stream);
}
else
{
var part = (MimePart)attachment;
part.Content.DecodeTo(stream);
}
XDocument xDocument = XDocument.Load(stream);
}
但是如果我使用FIleStream,它可以工作:
using (var stream = File.Create(fileName))
{
if (attachment is MessagePart rfc822)
{
rfc822.Message.WriteTo(stream);
}
else
{
var part = (MimePart)attachment;
part.Content.DecodeTo(stream);
}
}
XDocument xDocument = XDocument.Load(File.Open(fileName,
FileMode.OpenOrCreate));
在尝试加载流之前,需要将流回滚到开头。
换句话说,这样做:
stream.Position = 0;
XDocument xDocument = XDocument.Load(stream);