I'm trying to read from an XML file and use that to populate a question object I've created. This is the XML:
<?xml version="1.0" encoding="utf-8" ?>
<quiz>
<problem>
<question>Which of the following languages could be used in both Visual Studio and Unity?</question>
<answerA>Cobol</answerA>
<answerB>C#</answerB>
<answerC>C−−</answerC>
<answerD>French</answerD>
<correct>B</correct>
</problem>
<problem>
<question>What does XML stand for?</question>
<answerA>eXtremely Muddy Language</answerA>
<answerB>Xerxes, the Magnificent Chameleon</answerB>
<answerC>eXtensible Markup Language</answerC>
<answerD>eXecutes with Multiple Limitations</answerD>
<correct>C</correct>
</problem>
</quiz>
This is the class I'm using. The problem is in the loadQuestions() method.
public partial class frmQuestions : Form
{
private XmlDocument doc;
private XmlNode theQuiz;
private List<Question> questions;
private Random random;
public frmQuestions(string docName)
{
InitializeComponent();
doc = new XmlDocument();
doc.Load(docName);
questions = new List<Question>();
loadQuestions();
displayQuestion();
}
private void frmQuestions_Load(object sender, EventArgs e)
{
}
private void loadQuestions()
{
string question, a, b, c, d, correct;
theQuiz = doc.FirstChild;
for(int i = 0; i < theQuiz.ChildNodes.Count; i++)
{
XmlNode theQuestion = theQuiz.ChildNodes[i];
question = theQuestion["question"].InnerText;
a = theQuestion["answerA"].InnerText;
b = theQuestion["answerB"].InnerText;
c = theQuestion["answerC"].InnerText;
d = theQuestion["answerD"].InnerText;
correct = theQuestion["correct"].InnerText;
questions.Add(new Question(question, a, b, c, d, correct));
}
}
private void displayQuestion()
{
Random random = new Random();
int randomNumber = random.Next(1, questions.Count);
lblQuestion.Text = questions[randomNumber].getQuestion();
lblA.Text = questions[randomNumber].getA();
lblB.Text = questions[randomNumber].getB();
lblC.Text = questions[randomNumber].getC();
lblD.Text = questions[randomNumber].getD();
}
}
The problem I'm finding is that theQuiz.ChildNodes.Count = 0.
Anyone know where I'm going wrong?
In your code change theQuiz = doc.FirstChild;
to
theQuiz = doc.LastChild;
The rest looks fine. (I couldn't find where you have defined theQuiz). I tried the code and it is working with var theQuiz = doc.LastChild;
If you want to use LINQ then you can try the following:
XDocument xDoc = XDocument.Load("XMLFile1.xml");
var query = (from x in xDoc.Descendants("quiz").Elements("problem")
select new Question
{
question = x.Element("question").Value,
answerA = x.Element("answerA").Value,
answerB = x.Element("answerB").Value,
answerC = x.Element("answerC").Value,
answerD = x.Element("answerD").Value,
correct = x.Element("correct").Value
}).ToList();
This is assuming that you have one class Question with properties exposed as question, answerA ... and so on.
Use LINQ to XML:
Use LINQ to XML:
XDocument doc = XDocument.Load("YOURXML.xml");
var quiz = from elements in doc.Elements("quiz").Elements("problem")
select elements;
foreach (var item in quiz)
{
question = item.Element("question").Value;
a = item.Element("answerA").Value;
b = item.Element("answerB").Value;
c = item.Element("answerC").Value;
d = item.Element("answerD").Value;
correct = item.Element("correct").Value;
questions.Add(new Question(question, a, b, c, d, correct));
}
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