public static void Then <TComplition, TError>(this Promise <TComplition, TError> promise,
Action <bool, TComplition, TError> action)
{
promise.Then(complition => action(true, complition, default(TError)), error => action(false, default(TComplition), error));
}
public static void Then(this Promise promise, Action <bool> action)
{
promise.Then(() => action(true), () => action(false));
}