Unity注册一个接口多个对象并告诉Unity在哪里注入它们

Question

嗨,我一直在努力告诉Unity,如果它有多个实现,我希望它将它们注入不同的类中.这就是我的意思:

比方说,我有一个接口IProductCatalogService和两个实现 ProductCatalog : IProductCatalogService和ProductCatalogService : IProductCatalogService.

我如何告诉Unity,对于类AI,我希望在我的构造函数中传递一个类型的实例,ProductCatalog而对于Class B我想要一个实例ProductCatalogService.

我在ASP.NET Web API项目中使用Unity,并在中设置了解析器GLobalConfiguration.

对于简单的1对1注册,一切正常.

这是我尝试过但它似乎不起作用:

public class DependencyServiceModel
{
    public Type From { get; set; }
    public Type To { get; set; }
    public IEnumerable<Type> ForClasses { get; set; }
}

public void RegisterTypeForSpecificClasses(DependencyServiceModel dependencyService)
{
    foreach (var forClass in dependencyService.ForClasses)
    {
        string uniquename = Guid.NewGuid().ToString();

        Container.RegisterType(dependencyService.From, 
            dependencyService.To, uniquename);

        Container.RegisterType(forClass, uniquename, 
            new InjectionConstructor(
                new ResolvedParameter(dependencyService.To)));
    }
}

在DependencyServiceModel,From是接口,To是我想要实例化的对象,并且ForClasses是我想要使用ToObject的类型.

Answer 1

在下面的示例中,您有一个实现两次的接口,并根据您的要求按需注入两个不同的客户端类.诀窍是使用命名注册.

class Program
{
    static void Main(string[] args)
    {
        IUnityContainer container = new UnityContainer();
        container.RegisterType<IFoo, Foo1>("Foo1");
        container.RegisterType<IFoo, Foo2>("Foo2");

        container.RegisterType<Client1>(new InjectionConstructor(new ResolvedParameter<IFoo>("Foo1")));
        container.RegisterType<Client2>(new InjectionConstructor(new ResolvedParameter<IFoo>("Foo2")));

        Client1 client1 = container.Resolve<Client1>();
        Client2 client2 = container.Resolve<Client2>();
    }
}

public interface IFoo
{

}

public class Foo1 :IFoo
{

}

public class Foo2 : IFoo
{

}

public class Client1
{
    public Client1(IFoo foo)
    {

    }
}

public class Client2
{
    public Client2(IFoo foo)
    {

    }
}

这很可能是你做错了什么:

 Container.RegisterType(forClass, uniquename, 
        new InjectionConstructor(
            new ResolvedParameter(dependencyService.To)));

您可以为具体类创建命名注册.相反,你应该有

 Container.RegisterType(forClass, null, 
        new InjectionConstructor(
            new ResolvedParameter(dependencyService.To, uniquename)));