使用基於各種元素值的xpath搜索xml

Question

<OverallReport> 
    <Results> 
     <Data1> 
      <a> -30 </a> 
      <b> 400 </b> 
     </Data1> 
     <Data2> 
      <MoreData> 
        <c> 2 </c> 
        <d> 100 </d> 
      </MoreData> 
      <MoreData> 
        <c> 4 </c> 
        <d>200</d> 
      </MoreData> 
     </Data2> 
    </Results> 
    <Results> 
     <Data1> 
      <a> -50 </a> 
      <b> 600 </b> 
     </Data1> 
     <Data2> 
      <MoreData> 
        <c> 2 </c> 
        <d> 200 </d> 
      </MoreData> 
      <MoreData> 
        <c> 6 </c> 
        <d>500</d> 
      </MoreData> 
     <Data2> 
    </Results> 
</OverallReport> 

我有一個XML文檔，如上所述，它包含任意數量的結點節點和任意數量的MoreData節點。我必須找到包含兩個特定值（例如a = -50，b = 600）的結果節點，如果'c'等於特定值，則在該節點內找到'd'的值。所以基本上，如果a = -50，b = 600，c = 6，那麼d（它是兄弟）的值是多少。

我想用XPath做到這一點。到目前爲止，這裏是我的。我已經試過不給我我需要什麼，因爲XPath的所有D的

var resultsNodes = document.SelectNodes(「OverallReport/Results」); 
var data1ANodes = document.SelectNodes(「OverallReport/Results/Data1/a」); 
var data1BNodes = document.SelectNodes(「OverallReport/Results/Data1/b」); 

var data2CNodes = document.SelectNodes(「OverallReport/Results/Data2/c」); 
var data2DNodes = document.SelectNodes(「OverallReport/Results/Data2/d」); 

string wantedA = 「-50」; 
string wantedB = 「600」; 
string wantedC = 「6」; 
string wantedD = "500"; 

for (int i=0; i<resultsNodes.Count; i++) 
{ 
    if (data1Anodes[i].InnerXml == wantedA && data1Bnodes[i].InnerXml == wantedB) 
    { 
     //do something. 
     //the goal is to compare the output of D with wantedD 
     i = resultsNodes.Count; 
    } 
} 

一切都是一樣的。我對XML很陌生，所以也許我會忽略一些東西。

Answer 1

string wantedA = "-50"; 
string wantedB = "600"; 
string wantedC = "6"; 

string xpath = string.Format("OverallReport/Results[Data1/a={0} and Data1/b={1}]/Data2/MoreData[c={2}]/d", 
    wantedA, wantedB, wantedC); 

XmlNode nodeD = document.SelectSingleNode(xpath); 
Console.WriteLine(nodeD.InnerText);