获得在C＃

Question

XML值的一部分，我喜欢XML：

<RES> 
<MUL> 
    <SIN> 
    <KEY name="a"> 
    <VALUE>a1</VALUE> 
    </KEY> 
    <KEY name="b"> 
    <VALUE>b1</VALUE> 
    </KEY> 
    <KEY name="c"> 
    <VALUE>c1</VALUE> 
    </KEY> 
    <KEY name="need"> 
    <MUL> 
    <SIN> 
     <KEY name="needID"> 
     <VALUE>ID</VALUE> 
     </KEY> 
     <KEY name="needOther"> 
     <VALUE>other</VALUE> 
     </KEY> 
     <KEY name="needOther2"> 
     <VALUE>other2</VALUE> 
     </KEY> 
    </SIN> 
    </MUL> 
    </KEY> 
    </SIN> 
</MUL> 
</RES> 

我的问题是如何从与needID名称节点获得价值“身份证”？

我试着用

XmlDocument xx = new XmlDocument(); 
xx.Load(MYDOC); 

XmlNodeList node = xx.SelectNodes("/RES/MUL/SIN/KEY[@name='need']"); 

但在那之后，我不能挑needID与

XDocument doc = new XDocument(node); 
var cource = from x in doc.Descendants("KEY") 
select new { ID = doc.Element("VALUE").Value }; 

请帮帮我！

谢谢！ :)

Answer 1

你需要的东西是这样的：

// you're expecting only a single node - right?? So use .SelectSingleNode! 
XmlNode node = xx.SelectSingleNode("/RES/MUL/SIN/KEY[@name='need']"); 

// if we found the node... 
if(node != null) 
{ 
    // get "subnode" inside that node 
    XmlNode valueNode = node.SelectSingleNode("MUL/SIN/KEY[@name='needID']/VALUE"); 

    // if we found the <MUL>/<SIN>/<KEY name='needID'>/<VALUE> subnode.... 
    if(valueNode != null) 
    { 
     // get the inner text = the text of the XML element... 
     string value = valueNode.InnerText; 
    } 
} 

，或者你甚至可以认为合并成一个单一的XPath操作，假设您知道最多只有一个匹配的号码去你的XML文档中：

// define XPath 
string xpath = "/RES/MUL/SIN/KEY[@name='need']/MUL/SIN/KEY[@name='needID']/VALUE"; 

// you're expecting only a single node - right?? So use .SelectSingleNode! 
XmlNode node = xx.SelectSingleNode(xpath); 

// if we found the node... 
if(node != null) 
{ 
    // get the inner text = the text of the XML element... 
    string value = node.InnerText; 
} 

Answer 2

如何像下面

XDocument doc = XDocument.Load("url"); 

var cource = from x in doc.Descendants("KEY") 
       where x.Attribute("name").Value == "needID" 
       select new { ID = x.Element("VALUE").Value }; 

感谢

迪普

Answer 3

XmlDocument xml = new XmlDocument(); 

xml.Load(File.OpenRead(@"Your XML File")); 

//XmlNodeList xnList = xml.SelectNodes("/RES/MUL/SIN/KEY"); 

//You can use something like the below if the XML file is large and you need to read in more than one 
//foreach (XmlNode xn in xnList) 
//{ 
//Have a seperate class to store the values 
//class class = new class(); 
//class.ID = xn.SelectSingleNode("./@needID").Value; 
// 
//}