asp.net - Unity 注入(inject)到 asp.net web api Controller 和过滤器

Question

我有 WebForms 项目，并且有 WebApi Controller 。
如何注入(inject) Controller 构造函数和 Action 过滤器构造函数？

我已经实现了IDependencyResolver并在 Global.asax 中使用它( GlobalConfiguration.Configuration.DependencyResolver )，但它没有帮助:
请求 Controller 说没有默认构造函数，应用程序启动时的过滤器说它不包含带 0 个参数的构造函数。

此外，我需要单音注入(inject)到 Action 过滤器。

谢谢。

更新




public class ScopeContainer : IDependencyScope
{
 protected readonly IUnityContainer _container;

 public ScopeContainer(IUnityContainer container)
 {
 _container = container;
 }

 public object GetService(Type serviceType)
 {
 return _container.IsRegistered(serviceType) ? _container.Resolve(serviceType) : null;
 }

 public IEnumerable<object> GetServices(Type serviceType)
 {
 return _container.IsRegistered(serviceType) ? _container.ResolveAll(serviceType) : new List<object>();
 }

 public void Dispose()
 {
 _container.Dispose();
 }
}

public class IoCContainer : ScopeContainer, IDependencyResolver
{
 public IoCContainer(IUnityContainer container) : base(container)
 {
 }

 public IDependencyScope BeginScope()
 {
 var child = _container.CreateChildContainer();

 return new ScopeContainer(child);
 }
}

public class Global : HttpApplication
{
 void Application_Start(object sender, EventArgs e)
 {
 RegisterRoutes();
 ConfigureApi(GlobalConfiguration.Configuration);
 }

 void ConfigureApi(HttpConfiguration config)
 {
 var unity = new UnityContainer();

 unity.RegisterInstance<ILogger>(new Logger());
 unity.RegisterType<IRepository, DbRepository>();

 config.DependencyResolver = new IoCContainer(unity);
 }

 private static void RegisterRoutes()
 {
 RouteTable.Routes.MapHttpRoute("ServiceApi", "api/{controller}/{action}");
 }
}

Answer 1

我认为这可能是您注册路线的方式。

WebApi 路由在默认项目示例中通过 GlobalConfiguration.Routes 注册。而不是 RouteTable.Routes由 MVC Controller 使用。如果 MVC 路由方法错误地加载了 ApiController，它将找不到您的依赖关系解析器。

尝试将您的代码修改为:

public class Global : HttpApplication
{
    void Application_Start(object sender, EventArgs e)
    {
        RegisterRoutes(GlobalConfiguration.Configuration);
        ConfigureApi(GlobalConfiguration.Configuration);
    }

    void ConfigureApi(HttpConfiguration config)
    {
        var unity = new UnityContainer();

        unity.RegisterInstance<ILogger>(new Logger());
        unity.RegisterType<IRepository, DbRepository>();

        config.DependencyResolver = new IoCContainer(unity);
    } 

    private static void RegisterRoutes(HttpConfiguration config)
    {
        config.Routes.MapHttpRoute("ServiceApi", "api/{controller}/{action}");
    }

}