MVC 3个重要的描述对象之ControllerDescriptor

1.ControllerDescriptor

　　1.1 ReflectedControllerDescriptor

　　　　

 public class HomeController : Controller
    {
        public ActionResult Index()
        {
            ReflectedControllerDescriptor controllerDescriptor = new ReflectedControllerDescriptor(typeof(HomeController));
            return View(controllerDescriptor.GetCanonicalActions());
        }

        public void Action1()
        { }

        public static void Action2()
        { }

        private void Action3()
        { }

        public void Action4<T>()
        { }

        public void Action5(ref object obj)
        { }

        public void Action6(out object obj)
        {
            obj = null;
        }
    }

   显示效果

1	Index
2	Action1

有效的Action方法必要条件：方法所在类型必须继承抽象类ControllerBase,而不是IController接口

public class HomeController : IController
    {
        public void ValidAction()
        {
        }

        public void Execute(RequestContext requestContext)
        {
            this.ListValidActions(requestContext);
        }

        private void ListValidActions(RequestContext requestContext)
        {
            ReflectedControllerDescriptor controllerDescriptor = new ReflectedControllerDescriptor(typeof(HomeController));
            ActionDescriptor[] actionDescriptors = controllerDescriptor.GetCanonicalActions();
            if (actionDescriptors.Any())
            {
                foreach (ActionDescriptor actionDescriptor in actionDescriptors)
                {
                    requestContext.HttpContext.Response.Write(actionDescriptor.ActionName + "<br/>");
                }
            }
            else
            {
                requestContext.HttpContext.Response.Write("无合法的Action方法");
            }
        }
    }

　　无合法的Action方法

有效的Action方法必须继承自ControllerBase

 public class HomeController : ControllerBase
    {
        public void ValidAction()
        {
        }

        protected override void ExecuteCore()
        {
            this.ListValidActions(this.ControllerContext.RequestContext);
        }

        private void ListValidActions(RequestContext requestContext)
        {
            ReflectedControllerDescriptor controllerDescriptor = new ReflectedControllerDescriptor(typeof(HomeController));
            ActionDescriptor[] actionDescriptors = controllerDescriptor.GetCanonicalActions();
            if (actionDescriptors.Any())
            {
                foreach (ActionDescriptor actionDescriptor in actionDescriptors)
                {
                    requestContext.HttpContext.Response.Write(actionDescriptor.ActionName + "<br/>");
                }
            }
            else
            {
                requestContext.HttpContext.Response.Write("无合法的Action方法");
            }
        }
    }

输出结果：ValidAction

ReflectedControllerDescriptor的GetCanonicalActions方法具有缓存功能。第一次调用GetCanonicalActions方法返回的ActionDescriptor列表会被缓存起来作为后续调用的返回值