Custom events using CSharp

Eventz.cs

using UnityEngine;
using System;

public class EventContainer : MonoBehaviour {
  
  public class EmptyEvent {
    public delegate void EmptyDelegate();
    public event EmptyDelegate Event;
    public void Emit() { if(Event != null) Event(); }
  }
  
  public class IntEvent {
    public delegate void IntDelegate(int value);
    public event IntDelegate Event;
    public void Emit(int value) { if(Event != null) Event(value); }
  }

  public static EmptyEvent OnScore;

  public static IntEvent OnGameOver;

  void Awake() {
    OnScore = new EmptyEvent();
    OnGameOver = new IntEvent();
  }

}

Score.cs

using UnityEngine;

public class Score : MonoBehaviour {

  static int score;

  void Start() {
    EventContainer.OnScore.Event += IncScore;
  }
	
  void IncScore() {
    score++;
  }

}

ScorePrinter.cs

using UnityEngine;

public class ScorePrinter : MonoBehaviour {

  void Start() {
    EventContainer.OnGameOver.Event += ShowScore;
  }
	
  void ShowScore(int score) {
    print("" + score);
  }
  
}