unity simple service locator with singleton component

ServiceLocator.cs

using System;
using System.Collections.Generic;

namespace Utilities
{
    // singleton: https://gist.github.com/takumifukasawa/9519ed0f64abdf68608d098a3441b0d9
    public class ServiceLocator : SingletonComponent<ServiceLocator>
    {
        private static Dictionary<Type, object> _dictionary = new Dictionary<Type, object>();

        void Awake()
        {
            base.Awake();
        }

        public void Register<T>(object obj)
        {
            if (!_dictionary.ContainsKey(typeof(T)))
            {
                _dictionary.Add(typeof(T), obj);
            }
        }

        public T Resolve<T>() where T : class
        {
            if (_dictionary.ContainsKey(typeof(T)))
            {
                return _dictionary[typeof(T)] as T;
            }

            return default(T);
        }

        public void Clear()
        {
            _dictionary = new Dictionary<Type, object>();
        }
    }
}