Pattern matching in C#. This is terrible. Don't actually do this.

Program.cs

namespace PatternMatchTest
{
    class Program
    {
        public static void Main()
        {
            Animal[] TestCases = {
                new Dog(),
                new Cat { IsDangerous = true },
                new Cat { IsDangerous = false }
            };

            foreach(var animal in TestCases)
            {
                string sound = PatternMatchSound(animal);
                Console.WriteLine(sound);
            }
            Console.ReadKey();
        }

        static string PatternMatchSound(Animal animal)
        {
            try { throw animal; }
            catch(Dog d) { return d.Woof(); }
            catch(Cat c) when (c.IsDangerous) { return $"Watch out! {c.Sound()}"; }
            catch(Cat c) when (!c.IsDangerous) { return $"Awwwwwww! {c.Sound()}"; }
        }
    }

    class Dog : Animal { public string Woof() => "Woof!"; }
    class Cat : Animal {
        public bool IsDangerous { get; set; }
        public string Sound() => IsDangerous ? "Roar!" : "Meow!";
    }
    abstract class Animal : Exception { }
}