Question

我有一个类似这样的XML文件...（XML文件是在将一些值传递给它之后从Web服务[WCF]获取的。）

<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>

如下所示采用子元素的方法（用C＃编写），注释区域应该调用subQuestion类，但我不确定如何编写该部分：

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; }

}

该文件背后的实际代码，也是查询区域，如果他们有另一个子部分，我不知道如何调用：

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++;

     }
}

正如您可以从顶部看到的，我如何获取 SubQuestions （关键字和ParentQuestionID）的子元素，其中SubQuestion本身已经是子元素？

[edit]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，有些则不需要循环来检索。

   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

只要只有一个SubQuestions元素，您就可以分别Query.Element("SubQuestions").Element("Keywords") Query.Element("SubQuestions").Element("ParentQuestionID")轻松访问。{/ p>

[编辑] 对于具有SubQuestion类型对象的类，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; }

}

然后在您的查询中，您可以使用例如

 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")
                            }
                       };

在XML的另一个子元素中获取子元素

1 个答案: