使用netstream使用XPathDocument读取XML

Question

程序挂起:

XPathDocument xPathDocument = new XPathDocument(networkStream);

我认为这是由于XPathDocument仍在等待数据，但如何防止它?

Answer 1

由于服务器在发送整个XML后没有关闭连接(连接仍然打开以供将来通信)XPathDocument仍然等待数据。服务器不提供任何其他数据来确定XML传输是否完成。但是，可以检查根标记结尾是否接收到整个XML。XPathDocument不查找根标记结尾，所以这个解决方案有点棘手，但可以工作。我使用XmlReader读取流，并通过XmlWriter在StringWriter中写入XML。最后，StringWriter的字符串输出提供给StringReader，由XmlReader读取。最后，XPathDocument从这个XmlReader读取数据。下面是示例代码:

        XmlReader xmlReader = XmlReader.Create(networkStream);
        StringWriter stringWriter = new StringWriter();
        XmlWriter xmlReadBuffer = XmlWriter.Create(stringWriter);
        while (xmlReader.Read())
        {
            switch (xmlReader.NodeType)
            {
                case XmlNodeType.XmlDeclaration:
                    xmlReadBuffer.WriteStartDocument();
                    break;
                case XmlNodeType.Element:
                    xmlReadBuffer.WriteStartElement(xmlReader.Name);
                    if (xmlReader.HasAttributes)
                        xmlReadBuffer.WriteAttributes(xmlReader, false);
                    if (xmlReader.IsEmptyElement)
                        goto case XmlNodeType.EndElement;
                    break;
                case XmlNodeType.EndElement:
                    if (xmlReader.Depth == 0)
                    {
                        xmlReadBuffer.WriteEndElement();
                        xmlReadBuffer.WriteEndDocument();
                        goto EndXml;
                    }
                    xmlReadBuffer.WriteEndElement();
                    break;
                case XmlNodeType.Text:
                    xmlReadBuffer.WriteString(xmlReader.Value);
                    break;
                default:
                    break;
            }
        }
    EndXml:
    xmlReadBuffer.Flush();
    XPathDocument xPathDocument = new XPathDocument(XmlReader.Create(new StringReader(stringWriter.ToString())));

非常感谢elgonzo给我指出这一点