MemoryStream msXml = new MemoryStream();

XmlTextWriter xmlWriter = new XmlTextWriter(msXml, Encoding.UTF8);

xmlWriter.WriteStartElement("rss");

xmlWriter.WriteAttributeString("version", "2.0");

xmlWriter.WriteStartElement("channel");

xmlWriter.WriteElementString("title", "Test");

xmlWriter.WriteEndElement();

xmlWriter.WriteEndElement();

xmlWriter.Flush(); // 确保书写器更新到Stream中

msXml.Position = ; // 重置流的位置，以便我们可以从头读取

XmlReader xmlReader = XmlReader.Create(msXml);