csharp 运算符重载与动态绑定

Posted 2021-05-12

public static Finch operator +(Finch oldvalue, dynamic value)
{
    checked
    {
        if (value is Finch)
        {
            Finch newValue = value as Finch;
            oldvalue.Feet += newValue.Feet;
            oldvalue.Inches += newValue.Inches;
            return oldvalue;
        }
        else //try if its a fraction
        {
            decimal d;
            try
            {
                d = Convert.ToDecimal(value); // when conversion fails 
					// it throws exception in runtime
            }
            catch
            {
                throw;
            }
            oldvalue.Feet += Convert.ToInt32(Decimal.Truncate(d));
            var thisval =  Math.Abs(oldvalue.feet - d);
            oldvalue.Inches += (int)(.83f / Convert.ToSingle(thisval));
            return oldvalue;
        }
    }
}