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使用ninject的依赖注入不起作用

[英]Dependency Injection using ninject not working

我的目标很简单:我希望将已经存在的类“ MainWindowVM”(实现IMainWindowVM)的实例注入到“ StaticTestsResultsViewModel”类中。 我不希望实例化类“ MainWindowVM”的新实例。 相反,我希望将此类的现有实例注入到类“ StaticTestsResultsViewModel”中。

我的目标很简单:我希望将已经存在的类“ MainWindowVM”(实现IMainWindowVM)的实例注入到“ StaticTestsResultsViewModel”类中。 我不希望实例化类“ MainWindowVM”的新实例。 相反,我希望将此类的现有实例注入到类“ StaticTestsResultsViewModel”中。

在这种情况下,您应该像这样注册:

kernel.Bind<IMainWindowVM>().To<MainWindowVM>().InSingletonScope();

请记住,当您将一个类注册为单例时,这也会隐式地使其所有依赖项也变为单例。 请参阅强制性依赖 如果这对于您的应用程序设计是不可接受的,则应将存储共享属性的单例实例移到MainWindowVM的依赖项中, 而不要使MainWindowVM单例(例如瞬态)。

                          PropertyHolder (Singleton)
                         /
MainWindowVM (Transient)
                        \
                          OtherDependency (Any scope shorter than singleton)

几个月后,我遇到了同样的问题。 从块中删除安装Ninject时创建的类,然后将以下类粘贴到同一目录中。 据我所知,它不需要任何其他配置。 让我知道,

真心的

using Ninject;
using Ninject.Modules;
using Project.Data;
using Project.Interfaces;
using Project.Managers;
using Project.Repository;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Web;
using System.Web.Http;
using System.Web.Http.Dependencies;


namespace Project.App_Start
{
    /// <summary>
    /// Resolves Dependencies Using Ninject
    /// </summary>
    public class NinjectHttpResolver : IDependencyResolver, IDependencyScope
    {
        public IKernel Kernel { get; private set; }
        public NinjectHttpResolver(params NinjectModule[] modules)
        {
            Kernel = new StandardKernel(modules);
        }

        public NinjectHttpResolver(Assembly assembly)
        {
            Kernel = new StandardKernel();
            Kernel.Load(assembly);
        }

        public object GetService(Type serviceType)
        {
            return Kernel.TryGet(serviceType);
        }

        public IEnumerable<object> GetServices(Type serviceType)
        {
            return Kernel.GetAll(serviceType);
        }

        public void Dispose()
        {
            //Do Nothing
        }

        public IDependencyScope BeginScope()
        {
            return this;
        }
    }


    // List and Describe Necessary HttpModules
    // This class is optional if you already Have NinjectMvc
    public class NinjectHttpModules
    {
        //Return Lists of Modules in the Application
        public static NinjectModule[] Modules
        {
            get
            {
                return new[] { new MainModule() };
            }
        }

        //Main Module For Application
        public class MainModule : NinjectModule
        {
            public override void Load()
            {

                //Configure Your Bindings Here e.g


                Kernel.Bind<ILoginManager>().To<LoginManager>();
               >
    /// Its job is to Register Ninject Modules and Resolve Dependencies
    /// </summary>
    public class NinjectHttpContainer
    {
        private static NinjectHttpResolver _resolver;

        //Register Ninject Modules
        public static void RegisterModules(NinjectModule[] modules)
        {
            _resolver = new NinjectHttpResolver(modules);
            GlobalConfiguration.Configuration.DependencyResolver = _resolver;
        }

        public static void RegisterAssembly()
        {
            _resolver = new NinjectHttpResolver(Assembly.GetExecutingAssembly());
            //This is where the actual hookup to the Web API Pipeline is done.
            GlobalConfiguration.Configuration.DependencyResolver = _resolver;
        }

        //Manually Resolve Dependencies
        public static T Resolve<T>()
        {
            return _resolver.Kernel.Get<T>();
        }
    }
}

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