A simple service locator written for a project where "external" frameworks were not allowed :P

ServiceLocator.cs

  /// <summary>
    /// A simple service locator implementation
    /// </summary>
    public class ServiceLocator : IServiceLocator
    {
        //A List of the registered services
        private IDictionary<object, object> _services;
        
        public ServiceLocator() {
            _services = new Dictionary<object, object>();
        }
        
        /// <summary>
        /// Adds a service to the list of registered services
        /// </summary>
        /// <typeparam name="T">Key type of service</typeparam>
        /// <typeparam name="I">Instance type of service</typeparam>
        public void AddService<T,I>()
        {
            try
            {
                _services.Add(typeof(T), Activator.CreateInstance<I>());
            }
            catch {
                throw new Exception("Could not register service");                
            }
        }

        /// <summary>
        /// Gets a service by a key Type
        /// </summary>
        /// <typeparam name="T">Key type of service to fetch</typeparam>
        /// <returns></returns>
        public T GetService<T>()
        {
            try {
                return (T)_services[typeof(T)];
            }
            catch (KeyNotFoundException) {
                throw new Exception("No such service registered");
            }
        }
    }