ASP.NET MVC 整合 Spring.net（1）- Controller进容器

我们都知道Asp.net MVC自有一套执行机制。

通过分析MVC的MvcHandler关键代码

 

        protected internal virtual void ProcessRequest(HttpContextBase httpContext) {
            AddVersionHeader(httpContext);

            // Get the controller type
            string controllerName = RequestContext.RouteData.GetRequiredString("controller");

            // Instantiate the controller and call Execute
            IControllerFactory factory = ControllerBuilder.GetControllerFactory();
            IController controller = factory.CreateController(RequestContext, controllerName);
            if (controller == null) {
                throw new InvalidOperationException(
                    String.Format(
                        CultureInfo.CurrentUICulture,
                        MvcResources.ControllerBuilder_FactoryReturnedNull,
                        factory.GetType(),
                        controllerName));
            }
            try {
                controller.Execute(RequestContext);
            }
            finally {
                factory.ReleaseController(controller);
            }
        }

 

 

我们可以认为MVC中Controller都是基于工厂模式来创建对象的。

 

但是要利用Spring.net实现IOC和AOP，就必须管理这个框架中具体对象的创建工作。

即通过配置文件的方式决定一个具体对象的生或死！

<objects xmlns="http://www.springframework.net/">
  
  <object id="Demos.Domain.Object">
    <property name="Target">
      <object type="Demos.Domain.Object,Demos.Domain">
        <property name="Manager" ref="Demos.Domain.Manager"/>
      </object>
    </property>
  </object>
</objects>

 

 

但是MVC框架自己的运行机制决定了Controller的创建不会经过Spring。

 

幸好，MVC留下了一个叫做SetControllerFactory的扩展。

即，程序运行之初我们就可以用自己的ControllerFactory替换默认的ControllerFactory.

        protected void Application_Start()
        {
            //用自定义的构造工厂替换默认的
            ControllerBuilder.Current.SetControllerFactory(typeof(Demo.Core.ControllerFactory));

            RegisterRoutes(RouteTable.Routes);
        }

 

 

这样我们自己的工厂进行替换默认的Controller工厂后，就可以控制Controller的创建了。

 

我们自己的Controller工厂的代码

using System.Web.Mvc;
using System.Web.Routing;
using Spring.Context;

namespace Demo.Core
{
    public class ControllerFactory : IControllerFactory
    {
        /// <summary>
        /// Default ControllerFactory
        /// </summary>
        private static DefaultControllerFactory defalutf = null;

        public IController CreateController(RequestContext requestContext, string controllerName)
        {
            string controller = controllerName + "Controller";
            IApplicationContext ctx = Container.GetContext();

            if (ctx.ContainsObject(controller))
            {
                object controllerf = ctx.GetObject(controller);
                return (IController)controllerf;
            }
            else
            {
                if (defalutf == null)
                {
                    defalutf = new DefaultControllerFactory();
                }
                    
                return defalutf.CreateController(requestContext, controllerName);
            }
        }

        public void ReleaseController(IController controller)
        {
            IApplicationContext ctx = Container.GetContext();

            if (!ctx.ContainsObject(controller.GetType().Name))
            {
                if (defalutf == null)
                {
                    defalutf = new DefaultControllerFactory();
                }

                defalutf.ReleaseController(controller);
            }
        }
    }
}

 

 

 Spring.net 容器包装的代码

 

using System;
using System.Collections;
using System.Collections.Generic;
using Spring.Context;
using Spring.Context.Support;

namespace Demo.Core
{
    public class Container
    {
        /// <summary>
        /// 获取应用程序上下文.
        /// </summary>
        /// <returns><see cref="IApplicationContext"/>应用程序上下文.</returns>
        public static IApplicationContext GetContext()
        {
            if (FApplicationContext == null)
            {
                FApplicationContext = ContextRegistry.GetContext();
            }
            return FApplicationContext;
        }

        /// <summary>
        /// 获取应用程序上下文.
        /// </summary>
        /// <param name="name"><see cref="IApplicationContext"/>应用程序上下文名称.</param>
        /// <returns><see cref="IApplicationContext"/>应用程序上下文.</returns>
        public static IApplicationContext GetContext(string name)
        {
            return ContextRegistry.GetContext(name);
        }

        /// <summary>
        /// 获取对象.
        /// </summary>
        /// <typeparam name="T">对象的类型.</typeparam>
        /// <param name="id">标识.</param>
        /// <returns></returns>
        public static T GetObject<T>(string id)
        {
            return (T)GetContext().GetObject(id);
        }

        /// <summary>
        /// 获取对象类表.
        /// </summary>
        /// <typeparam name="T">对象的类型.</typeparam>
        /// <returns></returns>
        public static IList<T> GetObjects<T>()
        {
            IEnumerable items = GetContext().GetObjectsOfType(typeof(T));
            IList<T> objects = new List<T>();
            foreach (DictionaryEntry item in items)
            {
                objects.Add((T)item.Value);
            }
            return objects;
        }

        [ThreadStatic]
        private static IApplicationContext FApplicationContext;
    }
}

 

 

然后我们再新建个Demos.Controllers的项目。

using System.Web.Mvc;

namespace Demo.Controllers
{
    public class DemoController : Controller
    {
        public ViewResult Index()
        {
            ViewData["Message"] = "Welcome to IOC MVC";
            return View();
        }
    }
}

 

 

相应Dll的配置文件

<?xml version="1.0" encoding="utf-8" ?>
<objects xmlns="http://www.springframework.net/">
  <object id="DemoController" type="Demo.Controllers.DemoController, Demo.Controllers" singleton="false" >
  </object>
</objects>

 

并把配置文件设置为嵌入资源

然后再在Web.config中添加相应配置

 

  <sectionGroup name="spring">
      <section name="context" type="Spring.Context.Support.WebContextHandler, Spring.Web" />
      <section name="objects" type="Spring.Context.Support.DefaultSectionHandler, Spring.Core" />
  </sectionGroup>

  <spring>
    <context>
      <resource uri="config://spring/objects" />
      <resource uri="assembly://Demo.Controllers/Demo.Controllers/Controllers.xml" />
    </context>
    <objects xmlns="http://www.springframework.net" />
  </spring>

 

 

 

测试运行，我们可以发现这个DemoController已在Spring的容器中。