internal static IEnumerable <QuestionOption> CreateFractionOptions(int optionCount,
int minValue,
int maxValue,
bool isMR,
Func <ArithmeticFractionValuePart, bool> validationFun,
ArithmeticFractionValuePart correctFraction = null)
{
Random rand = new Random((int)DateTime.Now.Ticks);
List <QuestionOption> optionList = new List <QuestionOption>();
List <ArithmeticFractionValuePart> optionValueList = new List <ArithmeticFractionValuePart>();
ArithmeticFractionValuePart correctValue = null;
if (correctFraction != null)
{
correctValue = correctFraction;
}
for (int j = 0; j < optionCount - 1; j++)
{
while (true)
{
ArithmeticFractionValuePart fractionValue = null;
foreach (ArithmeticFractionValuePart value in CreateFractionValue(minValue, maxValue, minValue == 0 ? 1: minValue, maxValue))
{
fractionValue = value;
}
if (!isMR && validationFun(fractionValue))
{
correctValue = fractionValue;
Thread.Sleep(10);
continue;
}
IEnumerable <ArithmeticFractionValuePart> queryResult = optionValueList.Where <ArithmeticFractionValuePart>(c => c.Equals(fractionValue));
if (queryResult.Count <ArithmeticFractionValuePart>() > 0)
{
Thread.Sleep(10);
continue;
}
QuestionOption option = new QuestionOption();
option.OptionContent.Content = fractionValue.PlaceHolder;
option.OptionContent.ContentType = ContentType.Text;
option.OptionContent.QuestionPartCollection.Add(fractionValue);
if (isMR)
{
option.IsCorrect = validationFun(fractionValue);
}
optionList.Add(option);
optionValueList.Add(fractionValue);
break;
}
}
if (correctValue == null)
{
while (true)
{
ArithmeticFractionValuePart fractionValue = null;
foreach (ArithmeticFractionValuePart value in CreateFractionValue(minValue, maxValue, minValue == 0 ? 1 : minValue, maxValue))
{
fractionValue = value;
}
if (validationFun(fractionValue))
{
correctValue = fractionValue;
break;
}
Thread.Sleep(10);
}
}
QuestionOption correctOption = new QuestionOption();
correctOption.OptionContent.Content = correctValue.PlaceHolder;
correctOption.OptionContent.QuestionPartCollection.Add(correctValue);
correctOption.IsCorrect = true;
int correctOptionIndex = rand.Next(0, optionCount * 8) % optionCount;
if (correctOptionIndex == optionCount - 1)
{
optionList.Add(correctOption);
}
else
{
optionList.Insert(correctOptionIndex, correctOption);
}
Thread.Sleep(50);
return(optionList);
}