XML循环遍历C /CLI中的所有孩子和子孩子

Question

目前，我正在使用XML来创建一个数据结构，其中包含许多问题，其中包含诸如问题本身，答案等的信息，然后将其放置将变量显示在标签中。这是XML文件的示例：

<?xml version="1.0" encoding="utf-8"?>
<questionData>
    <question>
    <level> 1 </level>
    <ref> ref1 </ref>
    <questionText>This is a test question using XML!</questionText>
    <A>This is A using XML!</A>
    <B>This is B using XML!</B>
    <C>This is C using XML!</C>
    <D>This is D using XML!</D>
    <corrAnswer> A </corrAnswer>
    <APerc> 97 </APerc>
    <BPerc> 1 </BPerc>
    <CPerc> 1 </CPerc>
    <DPerc> 1 </DPerc>
    <PAFAnswer> A </PAFAnswer>
    <PAFFeeling> Sure </PAFFeeling>
    <FF> B </FF>
    <FFcorrPerc> 100 </FFcorrPerc>
    <FFwrongPerc> 0 </FFwrongPerc>
    <FFPAFAnswer> A </FFPAFAnswer>
    <FFPAFFeeling> Sure </FFPAFFeeling>
    <EXP> This is a test explanation for the info box. </EXP>
    <pronuns> pro-nun-cee-a-sh-un </pronuns>
    </question>
    <question>
    <level> 2 </level>
    <ref> ref2 </ref>
    <questionText>This is another test question using XML!</questionText>
    <A>This is A2 using XML!</A>
    <B>This is B2 using XML!</B>
    <C>This is C2 using XML!</C>
    <D>This is D2 using XML!</D>
    <corrAnswer> B </corrAnswer>
    <APerc> 96 </APerc>
    <BPerc> 1 </BPerc>
    <CPerc> 1 </CPerc>
    <DPerc> 2 </DPerc>
    <PAFAnswer> B </PAFAnswer>
    <PAFFeeling> Sure </PAFFeeling>
    <FF> A </FF>
    <FFcorrPerc> 100 </FFcorrPerc>
    <FFwrongPerc> 0 </FFwrongPerc>
    <FFPAFAnswer> B </FFPAFAnswer>
    <FFPAFFeeling> Sure </FFPAFFeeling>
    <EXP> This is another test explanation for the info box. </EXP>
    <pronuns> pro-nun-cee-a-sh-un two </pronuns>
    </question>
</questionData>

现在，我打算在此文件中有很多问题。但是，进步的测验越远，他们越难获得，因此我包括了一个称为级别的元素，该元素的数字与何时相对应的数字（例如，您在测验中有15个问题，您有问题3因此，它将XML文件解析为一个具有级别元素为3的问题，然后将数据加载到程序中）。

但是，有一个问题 - 很可能是逻辑错误。在C /CLI代码中，我有：

         XmlTextReader^ dataFromQFile = gcnew XmlTextReader("Millionaire\questionsData.xml");
         XmlDocument^ questionsData = gcnew XmlDocument();
         questionsData->Load("Millionaire\questionsData.xml");
         XmlElement^ root = questionsData->DocumentElement;
         XmlNodeList^ listOfQuestions = root->GetElementsByTagName("questionData");
         XmlNodeList^ Questions = root->GetElementsByTagName("question");
         for each (Questions in listOfQuestions)
         {
             levelFromXML = (root->GetElementsByTagName("level"))->Item(0)->InnerText;
             questionFromXML = (root->GetElementsByTagName("questionText"))->Item(0)->InnerText;
             AFromXML = (root->GetElementsByTagName("A"))->Item(0)->InnerText;
             BFromXML = (root->GetElementsByTagName("B"))->Item(0)->InnerText;
             CFromXML = (root->GetElementsByTagName("C"))->Item(0)->InnerText;
             DFromXML = (root->GetElementsByTagName("D"))->Item(0)->InnerText;
             corrFromXML = (root->GetElementsByTagName("corrAnswer"))->Item(0)->InnerText;
             APercFromXML = (root->GetElementsByTagName("APerc"))->Item(0)->InnerText;
             BPercFromXML = (root->GetElementsByTagName("BPerc"))->Item(0)->InnerText;
             CPercFromXML = (root->GetElementsByTagName("CPerc"))->Item(0)->InnerText;
             DPercFromXML = (root->GetElementsByTagName("DPerc"))->Item(0)->InnerText;
             phoneAnswerFromXML = (root->GetElementsByTagName("PAFAnswer"))->Item(0)->InnerText;
             phoneFeelingFromXML = (root->GetElementsByTagName("PAFFeeling"))->Item(0)->InnerText;
             fiftyAnswer = (root->GetElementsByTagName("FF"))->Item(0)->InnerText;
             fiftyCorrPerc = (root->GetElementsByTagName("FFcorrPerc"))->Item(0)->InnerText;
             fiftyWrongPerc = (root->GetElementsByTagName("FFwrongPerc"))->Item(0)->InnerText;
             fiftyPhoneAnswer = (root->GetElementsByTagName("FFPAFAnswer"))->Item(0)->InnerText;
             fiftyPhoneFeeling = (root->GetElementsByTagName("FFPAFFeeling"))->Item(0)->InnerText;
             exp = (root->GetElementsByTagName("EXP"))->Item(0)->InnerText;
             pronuns = (root->GetElementsByTagName("pronuns"))->Item(0)->InnerText;
         }

当我尝试循环浏览问题列表时（QuestionData是父母，问题是孩子，所涉及的所有数据是子孩子），当我尝试在标签中显示变量时，我没有得到文本因此，使我相信我在循环中犯了逻辑错误。我对XML相对较新，因此我无法发现错误。你们中的任何一个能够帮助我，或者可能知道执行上述任务的更有效的方法？谢谢。

Answer 1

您的root元素（分别是纪录片）已经是questionData元素，因此执行root->GetElementsByTagName("questionData")返回一个空列表。如果要在循环中处理question元素，则只需处理for each(question in questionsData->GetElementsByTagName("question"))，然后在循环内部确保在循环变量上调用方法，例如。levelFromXML = (question->GetElementsByTagName("level"))->Item(0)->InnerText;。

我还将使用https://msdn.microsoft.com/en-us/library/sssss31aas(v=vs.110)9.aspx?cs-save-save-save-lang = 1＆cs-amps; cs; css-lang = cppp#code-snippet-1而不是 GetElementsByTagName在循环内部，因此您可以简单地用levelFromXML = question["level"]->InnerText;替换上述摘要。