隐式转换错误[重复]

我正在写一类有理数。隐式转换会引发错误 (StackOverflowException)，其原因无法理解。下面是调用代码、类和错误截图

调用隐式转换

    [Test]
    public void ConvertFromInt()
    {
        Rational r = 5;
        AssertEqual(5, 1, r);
    }

理性类

public class Rational
{
    public int Numerator { get; set; }
    public int Denominator
    {
        get { return Denominator; }
        set
        {
            if (value <= 0)
                IsNan = true;
            else
                IsNan = false;
            Denominator = value;
        }
    }
    public bool IsNan { get; set; }

    public Rational(int numenator, int detominator)
    {
        Numerator = numenator;
        Denominator = detominator;
    }
    public Rational(int numenator) : this(numenator,1) { }
    public static implicit operator Rational(int number)
    {
        return new Rational(number);
    }
}