Ruby の unlessぽいヤツ

RubyUnless.cs

void Main()
{
	 var x = 1;

	 Unless(x == 0, () => Console.WriteLine("A"));
	 Unless(x == 0, () => Console.WriteLine("A"), () => Console.WriteLine("B"));

	 Console.WriteLine(Unless(x == 0, () => "A"));
	 Console.WriteLine(Unless(x == 0, () => "A", () => "B"));
}

public static void Unless(bool condition, Action then)
{
	if (!condition)
	{
		then();
	}
}

public static void Unless(bool condition, Action then, Action @else)
{
	if (!condition)
	{
		then();
	}
	else
	{
		@else();
	}
}

public static T Unless<T>(bool condition, Func<T> then)
{
	return (!condition)
		? then()
		: default(T);
}

public static T Unless<T>(bool condition, Func<T> then, Func<T> @else)
{
	return (!condition)
		? then()
		: @else();
}