C# 读取 IfcXML

    XmlDocument xmlDoc = new XmlDocument();
      XmlReaderSettings settings = new XmlReaderSettings { NameTable = new NameTable()};
      settings.IgnoreComments = true;
      XmlNamespaceManager xmlns = new XmlNamespaceManager(settings.NameTable);
      xmlns.AddNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
      xmlns.AddNamespace("ifc", "http://www.iai-tech.org/ifcXML/IFC2x2/FINAL");
      xmlns.AddNamespace("exp", "urn:oid:1.0.10303.28.2.1.1");
      xmlns.AddNamespace("doc", "urn:oid:1.0.10303.28.2.1.3");
      XmlParserContext context = new XmlParserContext(null, xmlns, "", XmlSpace.Default);
      XmlReader reader = XmlReader.Create(orgXMLFile, settings, context);
      xmlDoc.Load(reader);
      XmlNode root = xmlDoc.DocumentElement;
      XmlNodeList nodeList = root.ChildNodes;
    // ifc信息的根实体
      XmlNode ifcNode = null;
      foreach (XmlNode node in nodeList)
      {
          if (node.Name == "ifc:uos")
          {
              ifcNode = node;
              break;
          }
      }
    // 需要加词头prefix
    XmlNodeList xmlNodeList = root.SelectNodes("ifc:IfcReinforcingBar", xmlns);
    XmlNodeList xmlNodeList = root.SelectNodes("//ifc:IfcSlab/ifc:Tag", xmlns);