我的Unity运行非常适合我的ASP.NET Web API项目中的所有控制器 - 只使用NuGet框中的默认设置。我还设法将其连接到MVC过滤器属性 - 但似乎无法对ASP.NET Web API过滤器属性执行相同的操作。
如何扩展此默认实现以将依赖项注入ActionFilterAttribute,例如......
public class BasicAuthenticationAttribute : ActionFilterAttribute
{
[Dependency]
public IMyService myService { get; set; }
public BasicAuthenticationAttribute()
{
}
}
此过滤器使用属性
应用于控制器[BasicAuthentication]
我很确定我需要连接Unity容器以便它处理属性类的创建,但是需要一些关于从哪里开始的线索,因为它不使用与MVC过滤器相同的可扩展点。
我只想添加,我尝试过的其他内容包括服务位置而不是依赖注入,但是你得到的DependencyResolver与你配置的不一样。
// null
var service = actionContext.Request.GetDependencyScope().GetService(typeof(IMyService));
或者
// null
var service = GlobalConfiguration.Configuration.DependencyResolver.GetService(typeof(IApiUserService));
答案 0 :(得分:7)
问题是Attribute类是由.NET创建的,而不是由WebAPI框架创建的。
在进一步阅读之前,您是否忘记使用IApiUserService配置DependencyResolver?
(IUnityContainer)container;
container.RegisterType<IApiUserService, MyApiUserServiceImpl>();
...
var service = GlobalConfiguration.Configuration.DependencyResolver.GetService(typeof(IApiUserService));
我创建了一个App_Start \ UnityConfig类来保存我的UnityContainer:
public class UnityConfig {
#region Unity Container
private static Lazy<IUnityContainer> container = new Lazy<IUnityContainer>(() => {
var container = new UnityContainer();
RegisterTypes(container);
return container;
});
/// <summary>
/// Gets the configured Unity container.
/// </summary>
public static IUnityContainer GetConfiguredContainer() {
return container.Value;
}
#endregion
public static void Configure(HttpConfiguration config) {
config.DependencyResolver = new UnityDependencyResolver(UnityConfig.GetConfiguredContainer());
}
/// <summary>Registers the type mappings with the Unity container.</summary>
/// <param name="container">The unity container to configure.</param>
/// <remarks>There is no need to register concrete types such as controllers or API controllers (unless you want to
/// change the defaults), as Unity allows resolving a concrete type even if it was not previously registered.</remarks>
private static void RegisterTypes(IUnityContainer container) {
// NOTE: To load from web.config uncomment the line below. Make sure to add a Microsoft.Practices.Unity.Configuration to the using statements.
// container.LoadConfiguration();
// TODO: Register your types here
// container.RegisterType<IProductRepository, ProductRepository>();
container.RegisterType<MyClass>(new PerRequestLifetimeManager(), new InjectionConstructor("connectionStringName"));
}
}
UnityDependencyResolver
和PerRequestLifetimeManager
来自this blog post和Unity.WebApi(Project / Nuget Package)我内化了。 (因为它是一个引导程序)
当我需要在其他代码中使用UnityContainer时,我将其传递给构造函数:
config.Filters.Add(new MyFilterAttribute(UnityConfig.GetConfiguredContainer()));