XML文件节点，命名为值给定错误

Question

在下面的C＃.NET代码中，我在最后一行xndNodefac["Value"].InnerText遇到了一个问题，它给了我错误

  

＆＃34;对象引用未设置为对象的实例＆＃34;。

在XML文件中有一个节点调用＆＃34;值＆＃34;所有的节点都工作正常，当它来到这个＆＃34;价值＆＃34;节点我收到错误。

var nlfaci = xdcDocument.SelectNodes("/ns:HotelDetailRS/ns:Hotel/ns:FacilityList/ns:Feature", nsmgr);

foreach (XmlNode xndNodefac in nlfaci)
{
    Label lblfac = new Label();
    lblfac.Text = "Code : " + xndNodefac["Code"].InnerText + "<br />"; 
    DivFacilityList.Controls.Add(lblfac);

    Label lblfac1 = new Label();
    lblfac1.Text = "Name : " + xndNodefac["Name"].InnerText + "<br />"; 
    DivFacilityList.Controls.Add(lblfac1);

    Label lblfac2 = new Label();
    lblfac2.Text = "Description : " + xndNodefac["Description"].InnerText + "<br /><br />"; 
    DivFacilityList.Controls.Add(lblfac2);

    Label lblfac31 = new Label();
    lblfac31.Text = "Value : " + xndNodefac["Value"].InnerText + "<br /><br />"; 
    DivFacilityList.Controls.Add(lblfac31);
}

XML：

<HotelDetailRS xmlns="http://www.hotelbeds.com/schemas/2005/06/messages"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
               xsi:schemaLocation="http://www.hotelbeds.com/schemas/2005/06/messages HotelDetailRS.xsd" 
               echoToken="DummyEchoToken">
  <Hotel xsi:type="ProductHotel">
    <FacilityList>
      <Feature xsi:type="ProductFeatureSport" group="10">
        <Code>20</Code>
        <Name>buildingFacility</Name>
        <Description>Year of construction</Description>
        <Value>1985</Value>
      </Feature>
      <Feature xsi:type="ProductFeatureSport" group="10">
        <Code>30</Code>
        <Name>buildingFacility</Name>
        <Description>Year of most recent renovation</Description>
        <Value>2003</Value>
      </Feature>
      <Feature xsi:type="ProductFeatureSport" group="10">
        <Code>50</Code>
        <Name>buildingFacility</Name>
        <Description>Number of floors (main building)</Description>
        <Value>4</Value>
      </Feature>
    </FacilityList>
  </Hotel>
</HotelDetailRS>