[英]Dependency Injection using ninject not working
我的目標很簡單:我希望將已經存在的類“ MainWindowVM”(實現IMainWindowVM)的實例注入到“ StaticTestsResultsViewModel”類中。 我不希望實例化類“ MainWindowVM”的新實例。 相反,我希望將此類的現有實例注入到類“ StaticTestsResultsViewModel”中。
我的目標很簡單:我希望將已經存在的類“ MainWindowVM”(實現IMainWindowVM)的實例注入到“ StaticTestsResultsViewModel”類中。 我不希望實例化類“ MainWindowVM”的新實例。 相反,我希望將此類的現有實例注入到類“ StaticTestsResultsViewModel”中。
在這種情況下,您應該像這樣注冊:
kernel.Bind<IMainWindowVM>().To<MainWindowVM>().InSingletonScope();
請記住,當您將一個類注冊為單例時,這也會隱式地使其所有依賴項也變為單例。 請參閱強制性依賴 。 如果這對於您的應用程序設計是不可接受的,則應將存儲共享屬性的單例實例移到MainWindowVM
的依賴項中, 而不要使MainWindowVM
單例(例如瞬態)。
PropertyHolder (Singleton)
/
MainWindowVM (Transient)
\
OtherDependency (Any scope shorter than singleton)
幾個月后,我遇到了同樣的問題。 從塊中刪除安裝Ninject時創建的類,然后將以下類粘貼到同一目錄中。 據我所知,它不需要任何其他配置。 讓我知道,
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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