asp.net mvc和webapi试用ninject依赖注入

学习asp.net的过程中看了《精通ASP.NET MVC5》其中依赖注入使用了ninject。笔者使用的3.0版本。具体实现如下：

第一步：在nuget里面添加后会自动在APP_Start里面生成NinjetWebCommon.cs文件。

NinjectWebCommon[assembly: WebActivator.PreApplicationStartMethod(typeof(SportStore.WebUI.App_Start.NinjectWebCommon), "Start")]

[assembly: WebActivator.ApplicationShutdownMethodAttribute(typeof(SportStore.WebUI.App_Start.NinjectWebCommon), "Stop")]

namespace SportStore.WebUI.App_Start
{
    using System;
    using System.Web;

    using Microsoft.Web.Infrastructure.DynamicModuleHelper;

    using Ninject;
    using Ninject.Web.Common;
    using Ninject.Web.Common.WebHost;

    public static class NinjectWebCommon 
    {
        private static readonly Bootstrapper bootstrapper = new Bootstrapper();

        /// <summary>
        /// Starts the application
        /// </summary>
        public static void Start() 
        {
            DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
            DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
            bootstrapper.Initialize(CreateKernel);
        }
        
        /// <summary>
        /// Stops the application.
        /// </summary>
        public static void Stop()
        {
            bootstrapper.ShutDown();
        }
        
        /// <summary>
        /// Creates the kernel that will manage your application.
        /// </summary>
        /// <returns>The created kernel.</returns>
        private static IKernel CreateKernel()
        {
            var kernel = new StandardKernel();
            kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
            kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
            
            RegisterServices(kernel);
            return kernel;
        }

        /// <summary>
        /// Load your modules or register your services here!
        /// </summary>
        /// <param name="kernel">The kernel.</param>
        private static void RegisterServices(IKernel kernel)
        {
            System.Web.Mvc.DependencyResolver.SetResolver(new SportStore.WebUI.Infrastructure.NinjectDependencyResolver(kernel));
        }        
    }
}

第二步我们需要实现依赖解析接口 ：创建NinjectDependencyResolver.cs文件，实现IDependencyResolver。并在NinjetWebCommon文件里面注册就可以快乐的binding了。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Ninject;
using System.Web.Mvc;
using Ninject.Web.Common;
using Moq;
using SportStore.Domain.Entities;
using SportStore.Domain.Abstract;
using SportStore.Domain.Concreate;
using System.Configuration;
using SportStore.WebUI.Infrastructure.Abstract;
using SportStore.WebUI.Infrastructure.Concrete;

namespace SportStore.WebUI.Infrastructure
{
    public class NinjectDependencyResolver : IDependencyResolver
    {
        private IKernel kernel;
        public NinjectDependencyResolver(IKernel kernekParam )
        {
            kernel = kernekParam;
            AddBindings();
        }
        public object GetService( Type serviceType )
        {
            return kernel.TryGet(serviceType);
        }

        public IEnumerable<object> GetServices( Type serviceType )
        {
            return kernel.GetAll(serviceType);
        }
        private void AddBindings()
        {
            //Mock<IProductsRepository> mock = new Mock<IProductsRepository>();
            //mock.Setup(m => m.Products).Returns(new List<Product>
            //{
            //    new Product {Name="FootBALL",Price=25 ,Description="Nike"},
            //    new Product {Name="Surf board",Price=179 },
            //    new Product {Name="Running shoes",Price=95 }
            //});
            kernel.Bind<IProductsRepository>().To<EFProductRepository>();
            EmailSettings emailSettings = new EmailSettings
            {
                WriteAsFile = bool.Parse(ConfigurationManager.AppSettings["Email.WriteAsFile"] ?? "false")
            };
            kernel.Bind<IOrderProcessor>().To<EmailOrderProcessor>().WithConstructorArgument("settings", emailSettings);

            kernel.Bind<IAuthProvider>().To<FormsAuthProvider>();
        }
    }
}

然而在使用最新版本时，发现并不会自动生成NinjetWebCommon文件。当然我们可以用旧版的文件修改实现。后来去git查找发现并不需要这么麻烦了。直接继承NinjectHttpApplication。实现抽象类里面的CreateKernel（）就可以更快乐的bind了。