private void Parse(XPathNavigator navigator, bool fromAppConfig)
 {
     XPathNavigator xpn = navigator.SelectSingleNode(XmlHelper.PropertiesExpression);
     if (xpn != null)
     {
         propertiesManager = new SimpleCfgPropertiesManager(navigator);
     }
     else
     {
         if (!fromAppConfig)
         {
             CfgException e = new CfgException("配置文件中没有发现标签<properties xmlns='" + XmlHelper.SchemaXmlns + "'>。");
             throw e;
         }
     }
 }
        private SimpleCfgRootManager(XmlReader configurationReader, bool fromAppSetting)
        {
            XPathNavigator nav;
            try
            {
                nav = new XPathDocument(XmlReader.Create(configurationReader, (new XmlSchemas()).CreateConfigReaderSettings())).CreateNavigator();

            }
            catch (CfgException)
            {
                throw;
            }
            catch (Exception ex)
            {
                CfgException e = new CfgException("发生配置错误!", ex);
                throw e;
            }

            Parse(nav, fromAppSetting);
        }