[杂] ASP.NET MVC 之 Route To MvcHandler

首先，本文参考了不少东东，仅供Q_L_H自己使用，ZZ自己负责。先上一张全家福：

HttpModules and HttpHandlers

ASP.NET MVC 是 HttpHandler.

UrlRoutingModule 是 HttpModule, 在web.config里面注册。

UrlRoutingModule → MvcRouteHandler

MvcRouteHandler → MvcHandler

IHttpHandler IRouteHandler.GetHttpHandler(RequestContext requestContext)
   {
     return this.GetHttpHandler(requestContext);
   }

protected virtual IHttpHandler GetHttpHandler(RequestContext requestContext)
    {
      requestContext.HttpContext.SetSessionStateBehavior(this.GetSessionStateBehavior(requestContext));
      return (IHttpHandler) new MvcHandler(requestContext);
    }

MvcHandler → IController

private void ProcessRequestInit(HttpContextBase httpContext, out IController controller, out IControllerFactory factory)
    {
      HttpContext current = HttpContext.Current;
      if (current != null)
      {
        bool? nullable = ValidationUtility.IsValidationEnabled(current);
        if ((!nullable.GetValueOrDefault() ? 0 : (nullable.HasValue ? 1 : 0)) != 0)
          ValidationUtility.EnableDynamicValidation(current);
      }
      this.AddVersionHeader(httpContext);
      this.RemoveOptionalRoutingParameters();
      string requiredString = this.RequestContext.RouteData.GetRequiredString("controller");
      factory = this.ControllerBuilder.GetControllerFactory();
      controller = factory.CreateController(this.RequestContext, requiredString);
      if (controller != null)
        return;
      throw new InvalidOperationException(string.Format((IFormatProvider) CultureInfo.CurrentCulture, MvcResources.ControllerBuilder_FactoryReturnedNull, new object[2]
      {
        (object) factory.GetType(),
        (object) requiredString
      }));
    }

参考文章：

http://www.codeproject.com/Articles/595520/MvcRouteHandler-and-MvcHandler-in-ASP-NET-MVC-Fram

http://beletsky.net/2011/06/inside-aspnet-mvc-route-to-mvchanlder.html

http://msdn.microsoft.com/en-us/magazine/dd695917.aspx