What's a good way to check if a double is an integer in C#? [duplicate]

Answer 1

    public static bool CheckIfInteger(double number)
    {
        return number - Math.Truncate(number) == 0;
    }

Answer 2

I think that a better question is: How can I tell if a double is close enough to an integer to be considered an integer for my purposes? Because otherwise, you are bound to run into ambiguities. So I'd recommend something like this:

return Math.Abs(someDouble - Math.Round(someDouble)) < TOLERANCE;

Answer 3

If you want to check for an Integer, this will do it:

public bool IsInteger(double number)
{
    return (number % 1 == 0);
}

If you additionally want to check if the number could be converted into an Int32:

public bool IsInt32(double number)
{
    return (number % 1 == 0) && number >= Int32.MinValue && number <= Int32.MaxValue;
}