// Get random question for the currently selected units.
public Question GetRandomQuestionFromUnits(string userName, int record)
{
// Get user selected units.
var units = _commonHelper.GetUserSelectedUnits(userName);
// Get questions in random order for the currently selected units and does not match the record.
Random random = new Random();
var allValidQuestionIds = _questionRepository.GetAllQuestions().Where(q => units.Contains(q.Unit) && q.Id != record).OrderBy(x => random.Next()).Select(q => q.Id);
// Make a random selection from the randomly ordered list.
if (allValidQuestionIds.Count() > 0)
{
var index = allValidQuestionIds.ElementAt(random.Next(0, allValidQuestionIds.Count() - 1));
return(_questionRepository.GetQuestionById(index));
}
return(null);
}
// Get all question id for the selected units for a user.
private IEnumerable <int> GetAllValidQuestionId(string userName)
{
var units = _commonHelper.GetUserSelectedUnits(userName);
return(_questionRepository.GetAllQuestions().Where(q => units.Contains(q.Unit)).Select(q => q.Id));
}