Do we have a “Contains” method in IEnumerable

Question

I have a class in my code that is already deriving from IEnumerable. I was wondering if there is a way that I can use a \"Contains\" method on its instnaces to look for a so

Answer 1

public static bool Contains(this IEnumerable source, T value)
    {
        foreach (var i in source)
        {
            if (Equals(i, value))
                return true;
        }
        return false;
    }

If you want, you can add custom comparer as parameter ti extension method Contains