public class N2MVCRouteHandler : IRouteHandler
{
public IHttpHandler GetHttpHandler(RequestContext requestContext)
{ N2MVCHandler handler = new N2MVCHandler(); handler.RequestContext = requestContext; return handler;
}
}
public class N2MVCHandler : MvcHandler{ protected override void ProcessRequest(IHttpContext httpContext) { if (this.RequestContext == null) throw new InvalidOperationException("No RequestContext"); string controllerName = this.GetRequiredString(this.RequestContext.RouteData, "controller"); IController controller = this.CreateController(controllerName); ControllerContext controllerContext = new ControllerContext(base.RequestContext, controller); controller.Execute(controllerContext); } private IController CreateController(string controllerName) { N2MVCConfigurationHandler config = ConfigurationManager.GetSection("Nsquared2/N2MVCSection") as N2MVCConfigurationHandler; IN2ControllerFactory controllerFactory = N2ControllerFactoryBuilder.GetControllerFactory(config.ControllerFactory); IController controller = controllerFactory.CreateController(base.RequestContext, controllerName); return controller; }}
在这个例子中，我必须用我自己的接口来代替IControllerFactory，因为我希望传递Controller的名字而不是类型。封装在MVC Framework中的MvcHandler 里的ProcessRequest 尝试在没有程序集引用（references assemblies）的情况下定位Controller 然后创建这个类型的Controller 并把他传递给IController。CreateController 方法。但是我认为应该把寻找Controller类型的工作上移到ControllerFactory 中。下面是我的IControllerFactory 接口的具体实现。
public interface IN2ControllerFactory{ IController CreateController(RequestContext context, string controllerName);}
我觉得在这篇文章中使用Spring.Net和ControllerFactory来创建我的Controller。
public class N2ControllerFactory : IN2ControllerFactory{ public IController CreateController(RequestContext context, string controllerName) { IResource input = new FileSystemResource(context.HttpContext.Request.MapPath("objects.xml")); IObjectFactory factory = new XmlObjectFactory(input); IController controller = (IController)factory.GetObject(controllerName, typeof(IController)); if (typeof(Controller).IsAssignableFrom(controller.GetType())) { N2MVCConfigurationHandler config = ConfigurationManager.GetSection("Nsquared2/N2MVCSection") as N2MVCConfigurationHandler; ((Controller)controller).ViewFactory = N2ViewFactoryBuilder.GetViewFactory(config.ViewFactory); } return controller; }}
ControllerFactory的责任是创建Controller 并填充他需要的所有信息，比如本例中的ViewFactory。
IViewFactory的作用是创建一个责任是创建一个View的factory。因为Controller 并不需要实现Controller 基类（Controller base class）所以我将在我的代码中使用一个“代码规则（code policy）”。我将检查创建出来的Controller 是否继承了Controller 类（Controller class）。如果继承了我就创建一个IViewFactory 并把他注入Controller。IController 接口没有ViewFactory 属性，这些信息我们将在Controller基类中得到。
如果我们再回过头来看一遍IHttpHandler (N2MVCHandler)中的CreateContoller 方法，我们来看看他是怎么在web.config中得到ControllerFactory 的。
private IController CreateController(string controllerName){ N2MVCConfigurationHandler config = ConfigurationManager.GetSection("Nsquared2/N2MVCSection") as N2MVCConfigurationHandler; IN2ControllerFactory controllerFactory = N2ControllerFactoryBuilder.GetControllerFactory(config.ControllerFactory); IController controller = controllerFactory.CreateController(base.RequestContext, controllerName); return controller;}
下面这些是我们在web.config中指定conrollerFactory 和viewFactory的地方。这样我们就可以在web.config中轻松指定自己的ControllerFactory 和ViewFactory 。
<Nsquared2> <N2MVCSection controllerFactory="MvcApplication.Models.N2ControllerFactory, MvcApplication, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" viewFactory="MvcApplication.Models.N2ViewFactory, MvcApplication, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/></Nsquared2>
RouteTable.Routes.Add(new Route{ Url = "[controller]/[action]/[id]", Defaults = new { action = "Index", id = (string)null }, RouteHandler = typeof(N2MVCRouteHandler)});
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