我们先来看一下oXite里面一段Controller中Action方法的代码:
namespace Oxite.Controllers { public class AreaController : Controller { [ActionName("Find"), AcceptVerbs(HttpVerbs.Post)] public virtual OxiteModelList<Area> FindQuery(AreaSearchCriteria searchCriteria) { IList<Area> foundAreas = areaService.FindAreas(searchCriteria); OxiteModelList<Area> model = new OxiteModelList<Area> { List = foundAreas }; model.AddModelItem(searchCriteria); return model; }
看出上面的Action方法有什么不妥么?怎么Action方法返回的类型为OxiteModelList<Area>的呢?Controller的Action方法返回的不是ActionResult或者为Void的么?难道Action的返回值还可以是任意类型的?相信你看到Controller里面Action方法这些代码的时候,你也会产生这样的疑问。
默认情况下Action的返回值应该是ActionResult(推荐)或者void。那么这里为什么可以返回一个数据集合呢?你或许会想OxiteModelList<Area>会不会是继承自ViewResult呢?很遗憾的OxiteModelList<Area>并没是继承自ViewResult。正当我郁闷的时候,忽然看到ContainerFactory里面对IActionInvoker进行了Ioc注册:
于是很兴奋的跑去OxiteControllerActionInvoker里面看个究竟,果然是在这里做了手脚:
namespace Oxite.Infrastructure { public class OxiteControllerActionInvoker : ControllerActionInvoker { private readonly IFilterRegistry filterRegistry; public OxiteControllerActionInvoker(IFilterRegistry filterRegistry) { this.filterRegistry = filterRegistry; } protected override ActionResult CreateActionResult
(ControllerContext controllerContext, ActionDescriptor actionDescriptor, object actionReturnValue) { if (actionReturnValue == null) { controllerContext.Controller.ViewData.Model = new OxiteModel { Container = new NotFoundPageContainer() }; return new NotFoundResult(); } if (typeof(ActionResult).IsAssignableFrom(actionReturnValue.GetType())) return actionReturnValue as ActionResult; controllerContext.Controller.ViewData.Model = actionReturnValue; return new ViewResult { ViewData = controllerContext.Controller.ViewData, TempData = controllerContext.Controller.TempData }; }
OxiteControllerActionInvoker的继承关系如下:
OxiteControllerActionInvoker =>> ControllerActionInvoker –>> IActionInvoker 。
OxiteControllerActionInvoker重写了ControllerActionInvoker的CreateActionResult方法,该方法有一个命名为actionReturnValue的参数,从参数的命名我们很容易就可以看出这个参数的意义,没错她就是我们Action中返回的结果,从上面的代码我们可以看到将actionReturnValue赋值给了ViewData.Model,然后重新构造一个ViewResult的结果返回。相信看完上面的代码你已经豁然开朗了。
然后在OxiteControllerFactory对Controller的ActionInvoker修改为OxiteControllerActionInvoker :
namespace Oxite.Infrastructure { public class OxiteControllerFactory : DefaultControllerFactory { private readonly IUnityContainer container; public OxiteControllerFactory(IUnityContainer container) { this.container = container; } protected override IController GetControllerInstance(Type controllerType) { IController iController = container.Resolve(controllerType) as IController; if (typeof(Controller).IsAssignableFrom(controllerType)) { Controller controller = iController as Controller; if (controller != null) controller.ActionInvoker = container.Resolve<IActionInvoker>(); return iController; } return iController; } } }
前面已经对IActionInvoker进行了注册:
Enjoy。By Q.Lee.lulu