WebApi中使用Ninject 依赖注入

之前Ninject依赖注入是在MVC中使用，最近在WebApi中使用，用之前的MVC方式发现使用接口注入，一直是Null错误，网上查询了一些资源，总结一下，以后备用。

主要分为以下几步骤：

1. 　在NuGet上安装Ninject.MVC ,我安装的是最新版本nuget上安装Ninject.MVC5
2. 　定义两个类NinjectScope、NinjectResolver，用于实现最新版Web Api要求的IDependencyResolver
3. 在Global中添加如下代码

 protected void Application_Start()
        {

            //设置ApiController注入
            GlobalConfiguration.Configuration.DependencyResolver = new  NinjectResolver(CreateKernel());

            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
      /// <summary>
        /// 接口映射
        /// </summary>
        /// <returns></returns>
        public IKernel CreateKernel()
        {
            var Kernel = new StandardKernel();
            Kernel.Bind<IUser>().To<User>();

            return Kernel;
        }

　　 4、在使用的地方，按照如下调用即可

　　　　

   public class StudentController : ApiController
    {

        [Ninject.Inject]
        public IResource resource { get; set; }
        [Ninject.Inject]
        public IUser user { get; set; }

        [HttpPost]
        [AllowAnonymous]
        public object Login([FromBody] UserModel model)
        {
            var model = user.GetLogin(model.UserCode, EncryptPwd, sysRole);

        }
}

　　

 public class NinjectScope: IDependencyScope
    {
                    protected IResolutionRoot
             resolutionRoot;

                    public NinjectScope(IResolutionRoot
             kernel)
                    {
                        resolutionRoot
             = kernel;
                    }

                    public object GetService(Type
             serviceType)
                    {
                        IRequest
             request = resolutionRoot.CreateRequest(serviceType, null,
            new Parameter[0],
            true,
            true);
                        return resolutionRoot.Resolve(request).SingleOrDefault();
                    }

                    public IEnumerable<object>
             GetServices(Type serviceType)
                    {
                        IRequest
             request = resolutionRoot.CreateRequest(serviceType, null,
            new Parameter[0],
            true,
            true);
                        return resolutionRoot.Resolve(request).ToList();
                    }

                    public void Dispose()
                    {
                        IDisposable
             disposable = (IDisposable)resolutionRoot;
                        if (disposable
             != null)
                            disposable.Dispose();
                        resolutionRoot
             = null;
                    }
    }

　　

 public class NinjectResolver
   : NinjectScope, IDependencyResolver
    {
        private IKernel
         _kernel;
        public NinjectResolver(IKernel
         kernel)
        :
        base(kernel)
        {
            _kernel
             = kernel;
        }
        public IDependencyScope
         BeginScope()
        {
            return new NinjectScope(_kernel.BeginBlock());
        }
    }