MVC5 Controller简要创建过程

 1 public class MvcHandler : IHttpAsyncHandler, IHttpHandler, IRequiresSessionState
 2     {
 3           //...
 4           private ControllerBuilder _controllerBuilder;
 5           internal ControllerBuilder ControllerBuilder
 6         {
 7             get
 8             {
 9                 if (_controllerBuilder == null)
10                 {
11                     _controllerBuilder = ControllerBuilder.Current;
12                 }
13                 return _controllerBuilder;
14             }
15             set { _controllerBuilder = value; }
16         }
17            //...
18            protected internal virtual void ProcessRequest(HttpContextBase httpContext)
19         {
20             IController controller;
21             IControllerFactory factory;
22             ProcessRequestInit(httpContext, out controller, out factory);
23 
24             try
25             {
26                 controller.Execute(RequestContext);
27             }
28             finally
29             {
30                 factory.ReleaseController(controller);
31             }
32         }
33 
34         private void ProcessRequestInit(HttpContextBase httpContext, out IController controller, out IControllerFactory factory)
35         {
36             // ...
37             // Get the controller type
38             string controllerName = RequestContext.RouteData.GetRequiredString("controller");
39 
40             // Instantiate the controller and call Execute
41             factory = ControllerBuilder.GetControllerFactory();
42             controller = factory.CreateController(RequestContext, controllerName);
43             //...
44         }