获取子元素在XML的另一个子元素

Question

我有一个是这样的一个XML文件...（XML文件是从Web服务[WCF]通过采取一定的价值进去后。）

<Title> 
    <Questions> 
    <QuestionID> 1 </QuestionID> 
    <QuestionType> Quiz </QuestionType> 
    <Question> What is the shape? </Question> 
    <SubQuestionSequence> Part 1 </SubQuestionSequence> 
    <SubQuestions> 
      <Keywords> Ring </Keywords> 
      <ParentQuestionID> 1 </ParentQuestionID> 
    </SubQuestions> 
    <SubQuestionSequence> Part2 </SubQuestionSequence> 
    <SubQuestions> 
      <Keywords> Round </Keywords> 
      <ParentQuestionID> 1 </ParentQuestionID>    
    </SubQuestions> 
    </Questions> 
</Title> 

采取子元素如下（C＃编写）的方法，在评论区应该调用类subQuestion的，但我不知道怎么写的那部分：

public class Questions { 

    public int QuestionID { get; set; } 
    public string QuestionType { get; set; } 
    public string Question { get; set; } 
    public string SubQuestionSequence { get; set; }    
    //suppose to call subQuestion here 
} 

public class SubQuestion { 

    public string Keywords { get ; set ; } 
    public int ParentQuestionID { get; set; } 

} 

实际的代码背后的文件，也是查询区域，我不知道如何调用，如果他们有另一个子部分：

void client_GetQuestionCompleted(object sender, GetQuestionCompletedEventArgs e) 
{ 
    if (e.Error != null) 
     return; 

    string result = e.Result.Nodes[0].ToString(); 
    XDocument doc = XDocument.Parse(result); 

    var QuestionDetails = from Query in doc.Descendants("QuestionDetail") 
          select new Questions 
          { 
           QuestionID = (int)Query.Element("QuestionID"), 
           QuestionType = (string)Query.Element("QuestionType"), 
           Question = (string)Query.Element("Question"), 
           SubQuestionSequence = (string)Query.Element("SubQuestionSequence") 
          }; 

    int z = 0; 
    foreach (var QuestionDetail in QuestionDetails) 
    { 
      qID = QuestionDetail.QuestionID; 
      qType = QuestionDetail.QuestionType; 
      quest = QuestionDetail.Question; 
      subQS = QuestionDetail.SubQuestionSequence; 

      z++; 

    } 
} 

正如你可以从上面看到的，我怎么能采取的子问题（关键字和ParentQuestionID），其中SubQuestion本身就已经是一个子元素的子元素？

我如何检索子元素中的重复元素？我想要一些部分来循环和检索数据，有些不需要循环来检索。

int z = 0; 
    foreach (var QuestionDetail in QuestionDetails) 
    { 
     qID = QuestionDetail.QuestionID; 
     qType = QuestionDetail.QuestionType; 
     quest = QuestionDetail.Question; 
     subQS[z] = QuestionDetail.SubQuestionSequence; 
     //doing it this way, i can only retrieve one row of record only, 
     //even though i used an array to save. 
     subKeyword[z] = QuestionDetail.SubQuestion.Keywords;    

     z++; 

    } 

Answer 1

只要有只有一个SubQuestions元素，你可以简单地访问Query.Element("SubQuestions").Element("Keywords")分别Query.Element("SubQuestions").Element("ParentQuestionID")。

[编辑] 至于你同类型的对象类SubQuestion您只需使用

public class Questions { 

    public int QuestionID { get; set; } 
    public string QuestionType { get; set; } 
    public string Question { get; set; } 
    public string SubQuestionSequence { get; set; }    
    public SubQuestion SubQuestion{ get; set; } 
} 

public class SubQuestion { 

    public string Keywords { get ; set ; } 
    public int ParentQuestionID { get; set; } 

} 

，然后在您的查询，您可以使用如

var QuestionDetails = from Query in doc.Descendants("QuestionDetail") 
         select new Questions 
         { 
          QuestionID = (int)Query.Element("QuestionID"), 
          QuestionType = (string)Query.Element("QuestionType"), 
          Question = (string)Query.Element("Question"), 
          SubQuestionSequence = (string)Query.Element("SubQuestionSequence"), 
          SubQuestion = new SubQuestion() { 
           Keywords = (string)Query.Element("SubQuestions").Element("Keywords"), 
           ParentQuestionID = (int)Query.Element("SubQuestions").Element("ParentQuestionID") 
          } 
         };