ASP.NET MVC 从IHttp到页面输出的实例代码

MVCHandler : IHttpHandler
void IHttpHandler.ProcessRequest(HttpContext httpContext)
{
 this.ProcessRequest(httpContext);
}

protected virtual void ProcessRequest(HttpContext httpContext)
{
 HttpContextBase base2 = new HttpContextWrapper(httpContext);
 this.ProcessRequest(base2);
}
protected internal virtual void ProcessRequest(HttpContextBase httpContext)
{
 IController controller;
 IControllerFactory factory;
 this.ProcessRequestInit(httpContext, out controller, out factory);
 try
 {
 controller.Execute(this.RequestContext);
 }
 finally
 {
 factory.ReleaseController(controller);
 }
} 

Controller : ControllerBase : IController
void IController.Execute(RequestContext requestContext) //------>Controller
{
 this.Execute(requestContext);
}

protected virtual void Execute(RequestContext requestContext) //------>ControllerBase
{
 if (requestContext == null)
 {
 throw new ArgumentNullException("requestContext");
 }
 if (requestContext.HttpContext == null)
 {
 throw new ArgumentException(MvcResources.ControllerBase_CannotExecuteWithNullHttpContext, "requestContext");
 }
 this.VerifyExecuteCalledOnce();
 this.Initialize(requestContext);
 using (ScopeStorage.CreateTransientScope())
 {
 this.ExecuteCore();
 }
}
protected override void ExecuteCore() //------>Controller
{
 this.PossiblyLoadTempData();
 try
 {
 string requiredString = this.RouteData.GetRequiredString("action");
 if (!this.ActionInvoker.InvokeAction(base.ControllerContext, requiredString)) //public IActionInvoker ActionInvoker { get; set; }
 {
 this.HandleUnknownAction(requiredString);
 }
 }
 finally
 {
 this.PossiblySaveTempData();
 }
}

ControllerActionInvoker : IActionInvoker
public virtual bool InvokeAction(ControllerContext controllerContext, string actionName)
{
 if (controllerContext == null)
 {
 throw new ArgumentNullException("controllerContext");
 }
 if (string.IsNullOrEmpty(actionName))
 {
 throw new ArgumentException(MvcResources.Common_NullOrEmpty, "actionName");
 }
 ControllerDescriptor controllerDescriptor = this.GetControllerDescriptor(controllerContext);
 ActionDescriptor actionDescriptor = this.FindAction(controllerContext, controllerDescriptor, actionName);
 if (actionDescriptor == null)
 {
 return false;
 }
 FilterInfo filters = this.GetFilters(controllerContext, actionDescriptor);
 try
 {
 AuthorizationContext context = this.InvokeAuthorizationFilters(controllerContext, filters.AuthorizationFilters, actionDescriptor);
 if (context.Result != null)
 {
 this.InvokeActionResult(controllerContext, context.Result);
 }
 else
 {
 if (controllerContext.Controller.ValidateRequest)
 {
 ValidateRequest(controllerContext);
 }
 IDictionary<string, object> parameterValues = this.GetParameterValues(controllerContext, actionDescriptor);
 ActionExecutedContext context2 = this.InvokeActionMethodWithFilters(controllerContext, filters.ActionFilters, actionDescriptor, parameterValues);
 this.InvokeActionResultWithFilters(controllerContext, filters.ResultFilters, context2.Result);
 }
 }
 catch (ThreadAbortException)
 {
 throw;
 }
 catch (Exception exception)
 {
 ExceptionContext context3 = this.InvokeExceptionFilters(controllerContext, filters.ExceptionFilters, exception);
 if (!context3.ExceptionHandled)
 {
 throw;
 }
 this.InvokeActionResult(controllerContext, context3.Result);
 }
 return true;
}

protected virtual void InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
{
 actionResult.ExecuteResult(controllerContext);
}

ActionResult
public override void ExecuteResult(ControllerContext context)
{
 if (context == null)
 {
 throw new ArgumentNullException("context");
 }
 if (string.IsNullOrEmpty(this.ViewName))
 {
 this.ViewName = context.RouteData.GetRequiredString("action");
 }
 ViewEngineResult result = null;
 if (this.View == null)
 {
 result = this.FindView(context); //ViewEngineResult
 this.View = result.View; //IView接口 
 }
 TextWriter output = context.HttpContext.Response.Output;
 ViewContext viewContext = new ViewContext(context, this.View, this.ViewData, this.TempData, output);
 this.View.Render(viewContext, output);
 if (result != null)
 {
 result.ViewEngine.ReleaseView(context, this.View);
 }
}

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