What is the difference between UnityEngine.Events.Unityaction vs System.Action?

Question

What is the difference between UnityEngine.Events.Unityaction vs System.Action.

Can i use System.Action in Unity?

Can i use lambda as UnityAction?

Answer 1

Yes to both questions. For example, these two lines of code are formally the same:

System.Action<GameObject> myaction = (gameobj) => { Debug.Log(gameobj.name); } ;

UnityEngine.Events.UnityAction<GameObject> myaction = (gameobj) => { Debug.Log(gameobj.name); } ;