I am creating a quiz in C# as console app.
I have a single XML file that contains a) questions b) answers and c) incorrect answers.
I can read questions from my XML File.
However I cannot work out the logic I need to associate the incorrect and correct answers for each randomly generated read question.
Here is a copy of my XML file.
<?xml version="1.0" encoding="utf-8"?>
<Question xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<theQuestion>How many players in a football team?</theQuestion>
<answerA>12</answerA>
<answerB>10</answerB>
<answerC>20</answerC>
<answerD>11</answerD>
<correctAnswer>11</correctAnswer>
<theQuestion>How many minutes in a football game?</theQuestion>
<answerA>90</answerA>
<answerB>45</answerB>
<answerC>60</answerC>
<answerD>77</answerD>
<correctAnswer>90</correctAnswer>
</Question>
Here is part of my code:
ProcessData data = new ProcessData();
//load questions from XML file and store in list
var questions = data.LoadQuizQuestions();
//create a question object
Question q = new Question();
//get a question randomly generated from questions list
int index = new Random().Next(questions.Count);
//display the randomly generated question
Console.WriteLine(questions[index]);
Console.ReadLine();
Here is my LoadQuizQuestions()
public List<string> LoadQuizQuestions()
{
//create empty list to store quiz questions read in from file
List<string> questions = new List<string>();
//load questions from file into list
questions =
XDocument.Load(@"C:\Development\Learning\Files\qsFile.xml").Descendants("theQuestion").Select(o => o.Value).ToList();
//return list of questions
return questions;
}
I would like that when each random question is displayed the associated answers to that question are also displayed and the "correct answer" read into a variable that I can check the user input against.
Please help me understand I know I am close to nailing this :-)
Thank you
List<Question>
collection EDIT : Your XML input treats your data as sequential , not hierarchical; this will lead to potential problems when you tried to read the questions.
You should consider a structure like this:
<Questions>
<Question>
<Title>How many players in a football team?</Title>
<Options>
<Option>12</Option>
<Option>10</Option>
<Option>20</Option>
<Option IsCorrect='true'>11</Option>
</Options>
</Question>
<Question>
<Title>How many minutes in a football game?</Title>
<Options>
<Option IsCorrect='true'>90</Option>
<Option>45</Option>
<Option>60</Option>
<Option>77</Option>
</Options>
</Question>
</Questions>
This will make easier to read the XML manually, or deserialising it directly into a List<Question>
collection.
I made the decision to keep in the option if it's a correct answer, as this can be flexible enough to multiple right answers.
class Question
{
public string Title { get; private set; }
public List<Option> Options { get; private set; }
public Question()
{
}
public Question(XmlElement question) : this()
{
this.Title = question["Title"].InnerText;
this.Options = question.SelectNodes("Options/Option")
.OfType<XmlElement>()
.Select(option => new Option(option))
.ToList();
}
}
Not a big deal here: we just read an XmlElement
and delegates to the Option
class the item deserialization.
class Option
{
public string Title { get; private set; }
public bool IsCorrect { get; private set; }
public Option()
{
}
public Option(XmlElement option) : this()
{
this.Title = option.InnerText;
this.IsCorrect = option.GetAttribute("IsCorrect") == "true";
}
}
Same deal.
With this structure, you can do something like this:
var xml = new XmlDocument();
xml.LoadXml(@"...");
var random = new Random();
var questions = xml.SelectNodes("//Question")
.OfType<XmlElement>()
.Select (question => new Question(question))
.OrderBy(question => random.Next())
.ToList();
foreach (var question in questions)
{
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine(question.Title);
foreach (var option in question.Options)
{
Console.ForegroundColor = ConsoleColor.Gray;
Console.WriteLine("\t{0}", option.Title);
}
Console.Write("Choose the right option: ");
var answer = Console.ReadLine();
if (question.Options.Any(option =>
option.IsCorrect && answer.Equals(option.Title,
StringComparison.InvariantCultureIgnoreCase)))
{
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("YOU HAVE CHOSEN... WISELY.");
}
else
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("You have chosen poorly!");
}
}
If you use a question object that contains a list of answers, like this:
public class Question
{
public int ID { get; set; }
public string QuestionText { get; set; }
public List<Answer> Answers { get; set; }
public string AnswerText { get; set; }
}
public class Answer
{
public string ID { get; set; }
public string AnswerText { get; set; }
}
Then you can read the questions and answers into discrete objects, something like the code below (disclaimer: did not test this so it may need to be tweaked to work)
public List<Question> GetQuestions(string xmlFile)
{
var questions = new List<Question>();
var xDoc = XDocument.Load(xmlFile);
var questionNodes = xDoc.Descendants("theQuestion");
foreach (var questionNode in questionNodes)
{
var question = new Question();
question.QuestionText = questionNode.Value;
// do something like this for all the answers
var answer = new Answer();
answer.ID = "A";
var answerA = questionNode.Descendants("answerA").FirstOrDefault();
if (answerA != null)
answer.AnswerText = answerA.Value;
question.Answers = new List<Answer>();
question.Answers.Add(answer);
question.AnswerText =
questionNode.Descendants("correctAnswer").FirstOrDefault().Value;
}
return questions;
}
}
Now that you have the questions and answers in a single object you can display the question, the answers, and then based on user input do a string comparison to check the user's answer.
You can check my logic to get value form XMLNode
as you want.
If you can change your xml structure I'd do this:
<?xml version="1.0" encoding="utf-8"?>
<Questions>
<Question text="How many players in a football team?">
<answerA>12</answerA>
<answerB>10</answerB>
<answerC>20</answerC>
<answerD>11</answerD>
<correctAnswer>11</correctAnswer>
</Question>
<Question text="How many minutes in a football game?">
<answerA>90</answerA>
<answerB>45</answerB>
<answerC>60</answerC>
<answerD>77</answerD>
<correctAnswer>90</correctAnswer>
</Question>
</Questions>
Then deserialize using these classes:
public class Questions
{
[XmlElement("Question")]
public List<Question> QuestionList { get; set; } = new List<Question>();
}
public class Question
{
[XmlAttribute("text")]
public string Text { get; set; }
public string answerA { get; set; }
public string answerB { get; set; }
public string answerC { get; set; }
public string answerD { get; set; }
public string correctAnswer { get; set; }
}
And this code:
string path = "yourxmlfile.xml";
XmlSerializer serializer = new XmlSerializer(typeof(Questions));
StreamReader reader = new StreamReader(path);
var qs = (Questions)serializer.Deserialize(reader);
reader.Close();
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