Unity SendMessage alternative

GameObjectExtensions.cs

using UnityEngine;
using System.Linq;
using System.Collections;

public static class GameObjectExtensions
{
  public static void SendMessageToListeners<T>(this GameObject obj, T message)
  {
    foreach (var c in obj.GetInterfaceComponents<IListener<T>>())
      c.Listen(message);
  }
  
  public static void BroadcastMessageToListeners<T>(this GameObject obj, T message)
  {
    foreach (var c in obj.GetInterfaceComponentsInChildren<IListener<T>>())
      c.Listen(message);
  }
  
  #region Helpers
  // GetComponents in Unity by default doesn't work with interface because they aren't registered, so we'll do it ourselves.
  public static I[] GetInterfaceComponents<I>(this GameObject obj) where I : class
  {
    return obj.GetComponents(typeof(I)).Select (c => c as I).ToArray();
  }
  
  public static I[] GetInterfaceComponentsInChildren<I>(this GameObject obj) where I : class
  {
    return obj.GetComponentsInChildren(typeof(I)).Select (c => c as I).ToArray();
  }
  #endregion
}

IListener.cs

public interface IListener<T>
{
  void T Listen(T message);
}

MonoBehaviourBase.cs

using UnityEngine;

public class MonoBehaviourBase : MonoBehaviour
{
  void SendMessageToListeners<T>(T message)
  {
    this.gameObject.SendMessageToListeners(message);
  }
  
  void BroadcastMessageToListeners<T>(T message)
  {
    this.gameObject.BroadcastMessageToListeners(message);
  }
}