目的:面向接口编程,做到低耦合,高内聚
1.利用Nuget 管理工具,安装Ninject。
2.随便新建一个接口和一个实现类,我在此项目中是新建了一个ITextHelper接口和TextHelper实现类,定义方法GetString,代码代码如下。
public class TextHelper:ITextHelper
{
public string GetString(string text)
{
return text;
}
}
![复制代码](https://common.cnblogs.com/images/copycode.gif)
2.新建一个NinjectControllerFactory类,并继承DefaultControllerFactory(用来实例化控制器的工厂类),注意DefaultControllerFactory是在System.Web.Mvc的命名空间下面的,注册绑定ITextHelper与TextHelper的关系,并重写GetControllerInstance方法,代码如下:
public class NinjectControllerFactory : DefaultControllerFactory
{
IKernel ninjectKernel;
public NinjectControllerFactory()
{
ninjectKernel = new StandardKernel();
ninjectKernel.Bind<Services.ITextHelper>().To<Services.TextHelper>();
}
protected override IController GetControllerInstance(System.Web.Routing.RequestContext requestContext, Type controllerType)
{
return controllerType == null ? null : (IController)ninjectKernel.Get(controllerType);
}
}
3.新建一个TextController控制器,在TextController的构造函数里面,将ITextHelper 对象作为参数传进来,因为NinjectControllerFactory工厂类已经实例化了TextHelper对象,
在这里,你可以看到这里面只能看到ITextHelper,并看不到 ITextHelper的实现类,下次要修改啥业务,就不用动控制器了,完全做到分离,这样是不是变得更好维护了?!。
public class TextController : Controller
{
ITextHelper txtHelper;
public TextController(ITextHelper txtHelper)
{
this.txtHelper = txtHelper;
}
public ActionResult Index()
{
ViewBag.Str = txtHelper.GetString("高内聚,低耦合");
return View();
}
}
4.新建一个视图index.cshtml,
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@{
Layout = null ;
}
<!DOCTYPE html>
<html>
<head>
<meta name= "viewport" content= "width=device-width" />
<title>Index</title>
</head>
<body>
<div>
@ViewBag.Str(这是来自服务器的消息)
</div>
</body>
</html>
|
5.最后一步,在Global.asax 的Application_Start方法里面设置我们自定义的控制器工厂,其实就是加一行代码:
ControllerBuilder.Current.SetControllerFactory(new Factory.NinjectControllerFactory());
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
WebApiConfig.Register(GlobalConfiguration.Configuration);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
ControllerBuilder.Current.SetControllerFactory(new Factory.NinjectControllerFactory());
}