input system performed doesn't work code example

Example: unity new input system performed twice

_playerControls.MainGameplay.Dialogs.performed +=
            context =>
            {
                Debug.Log("Reads 1 when button pressed:" + context.ReadValue<float>());
                if (context.ReadValueAsButton())
                {
                    // performed is called twice.
                    // Once when ReadValueAsButton() is true (button down)
                    // And, once when it is false. (button up).
                    DoToggle();
                }
            };