使用Ninject将参数传递给Controller Constructor

Question

这是一个MVC应用程序,其中控制器需要构造函数中的a DataContextCreator和a CustomerID.我ControllerFactory看起来像:

public class NinjectControllerFactory : DefaultControllerFactory
    {
        private IKernel ninjectKernel;

        public NinjectControllerFactory()
        {
            ninjectKernel = new StandardKernel();
            AddBindings();
        }


        protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
        {
            if (controllerType == null)
            {
                return null;
            }
            else
            {
                string customerID =  requestContext.HttpContext.Session["CustomerID"].ToString();
                return (IController)ninjectKernel.Get(controllerType, new IParameter[]{new Parameter("CustomerID", customerID, true)});
            }
        }

        private void AddBindings()
        {
            ninjectKernel.Bind<IDataContextCreator>().To<DefaultDataContextCreator>();
        }
    }

导航到页面时出现以下错误,即触发Controller的创建:

 Ninject.ActivationException: Error activating int
No matching bindings are available, and the type is not self-bindable.
Activation path:
 2) Injection of dependency int into parameter CustomerID of constructor of type MyController
 1) Request for MyController

以上所有内容都是在Win 7上使用MVC3 .Net 4.感谢您的帮助.

Answer 1

你为什么要写一个自定义控制器工厂？在使用Ninject.MVC3NuGet包时,这种情况并不常见.更常见的技术是使用在安装此NuGet时自动为您注册的自定义依赖项提供程序.

所以这里是步骤:

1. 摆脱自定义控制器工厂
2. 安装Ninject.MVC3NuGet包.

3. 在~/App_Start/NinjectWebCommon.cs文件内部配置内核

   private static void RegisterServices(IKernel kernel)
   {
       kernel
           .Bind<IDataContextCreator>()
           .To<DefaultDataContextCreator>();
       kernel
           .Bind<MyController>()
           .ToSelf()
           .WithConstructorArgument("customerID", ctx => HttpContext.Current.Session["CustomerID"]);
   }