C# 使用Ninject在MVC 3中注入属性
我正在尝试将一个属性注入到我的名为UnitOfWorkAttribute的ActionFilter中。我有以下代码:C# 使用Ninject在MVC 3中注入属性,c#,asp.net-mvc-3,ninject,C#,Asp.net Mvc 3,Ninject,我正在尝试将一个属性注入到我的名为UnitOfWorkAttribute的ActionFilter中。我有以下代码: [Inject] public IUnitOfWork UnitOfWork { get; set; } 在执行之前,我告诉Ninject用以下方法解决此问题: Bind<IUnitOfWork>().To<NHibernateUnitOfWork>().InThreadScope(); 这是我的混凝土: public interface INHibe
[Inject]
public IUnitOfWork UnitOfWork { get; set; }
在执行之前,我告诉Ninject用以下方法解决此问题:
Bind<IUnitOfWork>().To<NHibernateUnitOfWork>().InThreadScope();
这是我的混凝土:
public interface INHibernateUnitOfWork : IUnitOfWork
{
ISession Session { get; }
}
public class NHibernateUnitOfWork : INHibernateUnitOfWork
{
private readonly ISessionSource sessionSource;
private ITransaction transaction;
private ISession session;
private bool disposed;
private bool begun;
public NHibernateUnitOfWork(ISessionSource sessionSource)
{
this.sessionSource = sessionSource;
Begin();
}
//.......
}
我正在完成//…下的接口
我做错了什么?问题是Ninject从来没有机会在ActionFilter上“做自己的事”,这是由
FilterAttributeFilterProvider在MVC内部处理的。您需要做的是告诉MVC使用一个自定义的FilterAttributeFilterProvider
,您可以在执行过滤器之前拦截它们。请允许我演示:
假设我有这个接口和实现:
public interface IFoo
{
}
public class Foo : IFoo
{
}
然后我有一个ActionFilter:
public class MyActionFilterAttribute : ActionFilterAttribute
{
public MyActionFilterAttribute()
{
}
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
//do something with Foo
base.OnActionExecuting(filterContext);
}
[Inject]
public IFoo Foo { get; set; }
}
然后我们有一个控制器:
public class HomeController : Controller
{
[MyActionFilter]
public ActionResult Index()
{
return View();
}
}
如果现在按原样运行,显然在MyActionFilter中Foo仍然是空的,所以让我们继续
让我们设置Ninject DependencyResolver:
public class NinjectDependencyResolver : IDependencyResolver
{
private readonly IKernel _kernel;
public NinjectDependencyResolver(IKernel kernel)
{
_kernel = kernel;
}
public object GetService(Type serviceType)
{
return _kernel.TryGet(serviceType);
}
public IEnumerable<object> GetServices(Type serviceType)
{
return _kernel.GetAll(serviceType);
}
}
公共类NinjectDependencyResolver:IDependencyResolver
{
私有只读IKernel_内核;
公共NinjectDependencyResolver(IKernel内核)
{
_内核=内核;
}
公共对象GetService(类型serviceType)
{
return _kernel.TryGet(serviceType);
}
公共IEnumerable GetServices(类型serviceType)
{
返回_kernel.GetAll(serviceType);
}
}
现在让我们在Global.asax中使用它:
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
DependencyResolver.SetResolver(new NinjectDependencyResolver(GetKernel()));
}
private IKernel GetKernel()
{
var kernel = new StandardKernel();
kernel.Bind<IFoo>().To<Foo>();
return kernel;
}
private IKernel GetKernel()
{
var kernel = new StandardKernel();
kernel.Bind<IFoo>().To<Foo>();
//use our custom NinjectFilterProvider
kernel.Bind<IFilterProvider>().To<NinjectFilterProvider>();
return kernel;
}
受保护的无效应用程序\u Start()
{
RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
注册地址(RouteTable.Routes);
SetResolver(新的NinjectDependencyResolver(GetKernel());
}
私有IKernel GetKernel()
{
var kernel=新的标准内核();
kernel.Bind().To();
返回内核;
}
越来越近了,但是MVC在创建操作过滤器时仍然没有办法使用Ninject内核。我们将在这里实现这一点
第一:
public class NinjectFilterProvider : FilterAttributeFilterProvider
{
private readonly IKernel _kernel;
public NinjectFilterProvider(IKernel kernel)
{
_kernel = kernel;
}
public override IEnumerable<Filter> GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
{
var filters = base.GetFilters(controllerContext, actionDescriptor);
foreach (var filter in filters)
{
_kernel.Inject(filter.Instance);
}
return filters;
}
}
公共类NinjectFilterProvider:FilterAttributeFilterProvider
{
私有只读IKernel_内核;
公共NinjectFilterProvider(IKernel内核)
{
_内核=内核;
}
公共覆盖IEnumerable GetFilters(ControllerContext ControllerContext,ActionDescriptor ActionDescriptor)
{
var filters=base.GetFilters(controllerContext,actionDescriptor);
foreach(过滤器中的var过滤器)
{
_注入(filter.Instance);
}
回流过滤器;
}
}
这里发生的事情是,我们正在创建一个自定义FilterAttributeFilterProvider类。在OnActionExecuting方法中,在我们通过基本实现获得所有过滤器之后,我们可以调用Ninjects Inject方法,该方法将检查实例并查看它是否可以向其中注入任何内容(使用Inject属性)
最后一个难题是为我们的定制过滤器TributeTFilterProvider设置绑定:
Global.asax:
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
DependencyResolver.SetResolver(new NinjectDependencyResolver(GetKernel()));
}
private IKernel GetKernel()
{
var kernel = new StandardKernel();
kernel.Bind<IFoo>().To<Foo>();
return kernel;
}
private IKernel GetKernel()
{
var kernel = new StandardKernel();
kernel.Bind<IFoo>().To<Foo>();
//use our custom NinjectFilterProvider
kernel.Bind<IFilterProvider>().To<NinjectFilterProvider>();
return kernel;
}
private IKernel GetKernel()
{
var kernel=新的标准内核();
kernel.Bind().To();
//使用我们的定制NinjectFilterProvider
kernel.Bind().To();
返回内核;
}
现在,当MVC获取一个IFilterProvider
(它会通过DependencyResolver自动执行此操作)它不会得到默认的FilterAttributeFilterProvider
,而是会得到我们的自定义NinjectFilterProvider
,因此我们的Foo实例将被填充到自定义操作筛选器中。问题是Ninject从来没有机会在ActionFilter上“做它该做的事”,这在MVC内部由FilterAttributeFilterProvider
处理。您需要做的是告诉MVC使用一个自定义的FilterAttributeFilterProvider
,您可以在执行过滤器之前拦截它们。请允许我演示:
假设我有这个接口和实现:
public interface IFoo
{
}
public class Foo : IFoo
{
}
然后我有一个ActionFilter:
public class MyActionFilterAttribute : ActionFilterAttribute
{
public MyActionFilterAttribute()
{
}
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
//do something with Foo
base.OnActionExecuting(filterContext);
}
[Inject]
public IFoo Foo { get; set; }
}
然后我们有一个控制器:
public class HomeController : Controller
{
[MyActionFilter]
public ActionResult Index()
{
return View();
}
}
如果现在按原样运行,显然在MyActionFilter中Foo仍然是空的,所以让我们继续
让我们设置Ninject DependencyResolver:
public class NinjectDependencyResolver : IDependencyResolver
{
private readonly IKernel _kernel;
public NinjectDependencyResolver(IKernel kernel)
{
_kernel = kernel;
}
public object GetService(Type serviceType)
{
return _kernel.TryGet(serviceType);
}
public IEnumerable<object> GetServices(Type serviceType)
{
return _kernel.GetAll(serviceType);
}
}
公共类NinjectDependencyResolver:IDependencyResolver
{
私有只读IKernel_内核;
公共NinjectDependencyResolver(IKernel内核)
{
_内核=内核;
}
公共对象GetService(类型serviceType)
{
return _kernel.TryGet(serviceType);
}
公共IEnumerable GetServices(类型serviceType)
{
返回_kernel.GetAll(serviceType);
}
}
现在让我们在Global.asax中使用它:
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
DependencyResolver.SetResolver(new NinjectDependencyResolver(GetKernel()));
}
private IKernel GetKernel()
{
var kernel = new StandardKernel();
kernel.Bind<IFoo>().To<Foo>();
return kernel;
}
private IKernel GetKernel()
{
var kernel = new StandardKernel();
kernel.Bind<IFoo>().To<Foo>();
//use our custom NinjectFilterProvider
kernel.Bind<IFilterProvider>().To<NinjectFilterProvider>();
return kernel;
}
受保护的无效应用程序\u Start()
{
RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
注册地址(RouteTable.Routes);
SetResolver(新的NinjectDependencyResolver(GetKernel());
}
私有IKernel GetKernel()
{
var kernel=新的标准内核();
kernel.Bind().To();
返回内核;
}
越来越近了,但是MVC在创建操作过滤器时仍然没有办法使用Ninject内核。我们将在这里实现这一点
第一:
public class NinjectFilterProvider : FilterAttributeFilterProvider
{
private readonly IKernel _kernel;
public NinjectFilterProvider(IKernel kernel)
{
_kernel = kernel;
}
public override IEnumerable<Filter> GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
{
var filters = base.GetFilters(controllerContext, actionDescriptor);
foreach (var filter in filters)
{
_kernel.Inject(filter.Instance);
}
return filters;
}
}
公共类NinjectFilterProvider:FilterAttributeFilterProvider
{
私有只读IKernel_内核;
公共NinjectFilterProvider(IKernel内核)
{
_内核=内核;
}
公共覆盖IEnumerable GetFilters(ControllerContext ControllerContext,ActionDescriptor ActionDescriptor)
{
var filters=base.GetFilters(controllerContext,actionDescriptor);
foreach(过滤器中的var过滤器)
{
_注入(filter.Instance);
}
回流过滤器;
}
}
这里发生的事情是,我们正在创建一个自定义FilterAttributeFilterProvid