无法使用Unity将依赖项注入ASP.NET Web API控制器
有没有人成功地使用IoC容器将依赖项注入ASP.NET WebAPI控制器？我似乎不能让它工作。
这就是我现在正在做的。
在我的global.ascx.cs
public static void RegisterRoutes(RouteCollection routes)
{
// code intentionally omitted
}
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
RegisterGlobalFilters(GlobalFilters.Filters);
RegisterRoutes(RouteTable.Routes);
IUnityContainer container = BuildUnityContainer();
System.Web.Http.GlobalConfiguration.Configuration.ServiceResolver.SetResolver(
t =>
{
try
{
return container.Resolve(t);
}
catch (ResolutionFailedException)
{
return null;
}
},
t =>
{
try
{
return container.ResolveAll(t);
}
catch (ResolutionFailedException)
{
return new System.Collections.Generic.List<object>();
}
});
System.Web.Mvc.ControllerBuilder.Current.SetControllerFactory(new UnityControllerFactory(container));
BundleTable.Bundles.RegisterTemplateBundles();
}
private static IUnityContainer BuildUnityContainer()
{
var container = new UnityContainer().LoadConfiguration();
return container;
}我的控制器工厂：
public class UnityControllerFactory : DefaultControllerFactory
{
private IUnityContainer _container;
public UnityControllerFactory(IUnityContainer container)
{
_container = container;
}
public override IController CreateController(System.Web.Routing.RequestContext requestContext,
string controllerName)
{
Type controllerType = base.GetControllerType(requestContext, controllerName);
return (IController)_container.Resolve(controllerType);
}
}它似乎从来没有在unity文件中解析依赖关系，并且我得到了一个错误，比如：
尝试创建类型为'PersonalShopper.Services.WebApi.Controllers.ShoppingListController'.的控制器时发生
错误确保控制器有一个无参数的公共构造函数。
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpControllerContext request，at System.Web.Http.Dispatcher.DefaultHttpControllerFactory.CreateInstance(HttpControllerContext controllerContext，controllerType) at System.Web.Http.Dispatcher.DefaultHttpControllerFactory.CreateInstance(HttpControllerContext controllerType，HttpControllerDescriptor controllerDescriptor) at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncInternal(HttpRequestMessage request，String controllerName) at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request，cancellationToken) at CancellationToken request，CancellationToken cancellationToken)
控制器看起来像：
public class ShoppingListController : System.Web.Http.ApiController
{
private Repositories.IProductListRepository _ProductListRepository;
public ShoppingListController(Repositories.IUserRepository userRepository,
Repositories.IProductListRepository productListRepository)
{
_ProductListRepository = productListRepository;
}
}我的unity文件如下所示：
<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
<container>
<register type="PersonalShopper.Repositories.IProductListRepository, PersonalShopper.Repositories" mapTo="PersonalShopper.Implementations.MongoRepositories.ProductListRepository, PersonalShopper.Implementations" />
</container>
</unity>请注意，我没有控制器本身的注册，因为在以前的mvc版本中，控制器工厂会找出需要解决的依赖项。
似乎我的控制器工厂从来没有被调用过。
回答 11
Stack Overflow用户
发布于 2012-03-03 14:38:28
我想通了。
对于ApiControllers，，MVC4使用System.Web.Http.Dispatcher.IHttpControllerFactory和System.Web.Http.Dispatcher.IHttpControllerActivator来创建控制器。如果没有静态方法来注册它们的实现；当它们被解析时，mvc框架将在依赖项解析器中查找这些实现，如果没有找到，则使用默认实现。
通过执行以下操作，我获得了控制器依赖关系的统一解析：
创建了一个UnityHttpControllerActivator：
public class UnityHttpControllerActivator : IHttpControllerActivator
{
private IUnityContainer _container;
public UnityHttpControllerActivator(IUnityContainer container)
{
_container = container;
}
public IHttpController Create(HttpControllerContext controllerContext, Type controllerType)
{
return (IHttpController)_container.Resolve(controllerType);
}
}将该控制器激活器注册为unity容器本身中的实现：
protected void Application_Start()
{
// code intentionally omitted
IUnityContainer container = BuildUnityContainer();
container.RegisterInstance<IHttpControllerActivator>(new UnityHttpControllerActivator(container));
ServiceResolver.SetResolver(t =>
{
// rest of code is the same as in question above, and is omitted.
});
}Stack Overflow用户
发布于 2012-05-15 07:45:52
Stack Overflow用户
发布于 2012-03-21 00:30:34
您可能想看看Unity.WebApi NuGet包，它将解决所有这些问题，并满足IDisposable组件的需求。
看见
http://nuget.org/packages/Unity.WebAPI
或
http://www.devtrends.co.uk/blog/introducing-the-unity.webapi-nuget-package
https://stackoverflow.com/questions/9527988
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