在ASP.Net MVC中实现Unity的正确方法是什么？

Question

好的，当你搜索这个主题时，在谷歌里会有很多结果：NerdDinner，CodeClimber，CodeProject等等。但它们似乎都没有像预期的那样工作！它们要么在构建过程中出错，要么在运行时出错！在ASP.Net MVC2中实现Unity2.0的正确方法是什么？我就是不能让它工作！

非常感谢您的帮助和想法。谢谢!

Answer 1

尝试使用Unity编写一个简单的控制器工厂，它能够解析控制器实例：

public class UnityControllerFactory : DefaultControllerFactory 
{
    private readonly IUnityContainer _container; 
    public UnityControllerFactory(IUnityContainer container) 
    { 
        _container = container; 
    }

    protected override IController GetControllerInstance(
        RequestContext requestContext, 
        Type controllerType
    ) 
    { 
        if (controllerType == null)
        {
            throw new ArgumentNullException("controllerType");
        }
        if (!typeof(IController).IsAssignableFrom(controllerType))
        {
            throw new ArgumentException("Type requested is not a controller", "controllerType");
        }
        return _container.Resolve(controllerType) as IController; 
    }
}

然后将其挂接到Global.asax中的Application_Start事件中

protected void Application_Start()
{
    ...
    var container = new UnityContainer();
    // TODO: Configure the container here with your controllers

    var factory = new UnityControllerFactory(container);
    ControllerBuilder.Current.SetControllerFactory(factory);
}

Answer 2

这是我的UnityControllerFactory版本。它使用反射从调用程序集获取控制器，并在容器中注册它们。

using System;
using System.Configuration;
using System.Linq;
using System.Reflection;
using System.Web.Mvc;
using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.Configuration;

namespace WebProveidorsMVC.DI.ControllerFactories
{
    public class UnityControllerFactory : DefaultControllerFactory
    {
        private readonly IUnityContainer _container;

        public UnityControllerFactory()
        {
            _container=new UnityContainer();

            ((UnityConfigurationSection) ConfigurationManager.GetSection("unity")).Configure(_container);

            var controllerTypes = from t in Assembly.GetCallingAssembly().GetTypes()
                                  where typeof(IController).IsAssignableFrom(t)
                                  select t;

            foreach (var t in controllerTypes)
                _container.RegisterType(t, t.FullName);
        }

        protected override IController GetControllerInstance(System.Web.Routing.RequestContext requestContext, Type controllerType)
        {
            if (controllerType != null)
                return (IController)_container.Resolve(controllerType);
            return null;
        }

        public override void ReleaseController(IController controller)
        {
            _container.Teardown(controller);
            base.ReleaseController(controller);
        }
    }
}

然后在我的ApplicationStart方法中，我像这样注册它：

ControllerBuilder.Current.SetControllerFactory(new UnityControllerFactory());