ASP.NET MVC如何从IHttp到页面输出

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代码如下:

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);
}
}

代码如下:

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();
}
}

代码如下:

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 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);
}

代码如下:

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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