A class which allow switch...case-style code for matching type

TypeSwitch.cs

public class TypeSwitch : ReadOnlyTypeSwitch {
	public TypeSwitch Case<T>(Action<T> action) {
		matches.Add(typeof(T), x => action((T) x));
		return this;
	}

	public ReadOnlyTypeSwitch Default(Action @default) {
		this.@default = @default ?? delegate { };
		return this;
	}
}

public class ReadOnlyTypeSwitch {
	protected Action @default = delegate { };
	protected readonly Dictionary<Type, Action<object>> matches = new Dictionary<Type, Action<object>>();

	protected ReadOnlyTypeSwitch() { }

	public void Switch<T>(T x) {
		Action<object> a;
		if (matches.TryGetValue(x.GetType(), out a))
			a(x);
		else
			@default();
	}
}

static void Main(string[] args) {
	var ts = new TypeSwitch()
		.Case<int>(x => Console.WriteLine("int"))
		.Case<bool>(x => Console.WriteLine("bool"))
		.Case<string>(x => Console.WriteLine("string"))
		.Default(() => { throw new ArgumentOutOfRangeException(); });

	ts.Switch(42);
	ts.Switch(false);
	ts.Switch("hello");
}