Linq to xml小问题，在线等，谢谢各位了！菜鸟给你们鞠躬了！

[wenjunsu]

我的xml
XML code

<?xml version="1.0" encoding="gb2312"?>
<Configurations version="987654" xmlns="http://www.ytlcn.com">
  <SensorDefList>
    <SensorDef id="1" name="红外传感器" description="" type="273" address="9a3b2451" />
    <SensorDef id="2" name="门廊开关" description="门廊灯" type="258" address="9a3b2452" />
    <SensorDef id="3" name="厨房卫生间开关" description="单键开关" type="258" address="9a3b2453" />
    <SensorDef id="4" name="客厅开关" description="双键开关" type="260" address="9a3b2454" />
    <SensorDef id="5" name="卧室床头开关" description="单键开关" type="258" address="9a3b2455" />
    <SensorDef id="6" name="卧室门口开关" description="双键开关" type="260" address="9a3b2456" />
    <SensorDef id="7" name="卧室阳台门窗磁" description="" type="272" address="9a3b2457" />
    <SensorDef id="8" name="阳台照度传感器" description="" type="514" address="9a3b2458" />
    <SensorDef id="9" name="门卡" description="" type="274" address="9a3b2459" />
    <SensorDef id="10" name="关门廊灯定时器" description="" type="771" param1="3" />
    <SensorDef id="11" name="温感" description="" type="1025" address="9a3b2461" />
    <SensorDef id="12" name="天亮时段" description="" type="770" param1="180" param2="e3" />
    <SensorDef id="13" name="傍晚时段" description="" type="770" param1="480" param2="e3" />
  </SensorDefList>
</Configurations>

我的代码

             XDocument doc = new XDocument();
            doc = XDocument.Load(AppDomain.CurrentDomain.BaseDirectory + "Configuration.xml");

            XNamespace ns = "http://www.ytlcn.com";
            List<XElement> elementList = doc.Descendants(ns + "SensorDef").ToList();

然后我有个SensorDef的实体，如下：

public class SensorDef
    {
        private String Id;

        public String id
        {
            get { return Id; }
            set { Id = value; }
        }
        private String Name;

        public String name
        {
            get { return Name; }
            set { Name = value; }
        }
        private String Description;

        public String description
        {
            get { return Description; }
            set { Description = value; }
        }
        private String Type;

        public String type
        {
            get { return Type; }
            set { Type = value; }
        }
        private String Address;

        public String address
        {
            get { return Address; }
            set { Address = value; }
        }
        private String ParamOne;

        public String paramOne
        {
            get { return ParamOne; }
            set { ParamOne = value; }
        }
        private String ParamTwo;

        public String paramTwo
        {
            get { return ParamTwo; }
            set { ParamTwo = value; }
        }
    }

然后我想把刚才查到的elementList 这个List赋值到List<SensorDef>中，代码如下：

 var god = from xl in elementList
                      select new SensorDef
                      {
                          id = xl.Attribute("id").Value,
                          name = xl.Attribute("name").Value,
                          description = xl.Attribute("description").Value,
                          type = xl.Attribute("type").Value,
                          address = xl.Attribute("address").Value,
                          paramOne = xl.Attribute("param1").Value,
                          paramTwo = xl.Attribute("param2").Value,
                      };
            List<SensorDef> sensorList = (List<SensorDef>)god;

但是这么写。linq是错的。请大神帮个忙啊

[tangxu12]

把你的问题简化点把!
大家没这么多时间看的

[孟子E章]

出错是因为你的xm中有些节点param1是没有的。

[孟子E章]

xl.Attribute("param1")为null了，xl.Attribute("param1").value也就错了

[孟子E章]

你可以这样

XNamespace ns = "http://www.ytlcn.com";
IEnumerable<XElement> elementList = doc.Descendants(ns + "SensorDef");
  
var god = from xl in elementList
          select new SensorDef
          {
            id = xl.Attribute("id").Value,
            name = xl.Attribute("name").Value,
            description = xl.Attribute("description").Value,
            type = xl.Attribute("type").Value,
            address = xl.Attribute("address") == null ? "" : xl.Attribute("address").Value,
            paramOne = xl.Attribute("param1") == null ? "" : xl.Attribute("param1").Value,
            paramTwo = xl.Attribute("param2") == null ? "" : xl.Attribute("param2").Value
          };
      
List<SensorDef> sensorList = god.ToList<SensorDef>();
MessageBox.Show(sensorList.Count.ToString());

[q107770540]

顶楼上

注意要对节点进行非空判断

http://blog.csdn.net/q107770540/article/details/6117004