C# Unity 依赖注入，如何检索可枚举的实例？

Question

我正在尝试注册相同 class 的多个实例，以便在我注入该 class 的可枚举时，我检索所有实例。

public class ActionDialogType
{
    public Type Type { get; set; }

    public string Name { get; set; }
}



public class ActionDialogTypeUser
{
    private IEnumerable<ActionDialogType> _types;
    public ActionDialogTypeUser(IEnumerable<ActionDialogType> types)
    {
        _types = types
    }
    public void DoSomethingWithTypes()
    {
        // Do Something with types
    }
}

到目前为止我有：

public class UnityConfig
{
    public IUnityContainer Register()
    {
        UnityContainer container = new UnityContainer();

        ActionDialogType actionDialogType1 = new ActionDialogType
        {
            Name = "Something",
            Type = typeof(Something)
        };
        container.RegisterInstance<IActionDialogType>(actionDialogType1, new ContainerControlledLifetimeManager());

        ActionDialogType actionDialogType2 = new ActionDialogType
        {
            Name = "SomethingElse",
            Type = typeof(SomethingElse)
        };
        container.RegisterInstance<ActionDialogType>(actionDialogType2, new ContainerControlledLifetimeManager());
        container.RegisterType<IEnumerable<ActionDialogType>, ActionDialogType[]>();

        return container;
    }
}

谁能告诉我怎么做？

Answer 1

只需注册依赖项名称然后解析：

...
 container.RegisterInstance<IActionDialogType>("actionDialogType1", actionDialogType1, new ContainerControlledLifetimeManager());
...
 container.RegisterInstance<IActionDialogType>("actionDialogType2", actionDialogType2, new ContainerControlledLifetimeManager());

 var actionDialogTypeUser = container.Resolve<ActionDialogTypeUser>();

构造函数也应具有相同的类型（在您的情况下为接口）：

public ActionDialogTypeUser(IEnumerable<IActionDialogType> types)
{
    _types = types
}

Answer 2

您应该能够解决 IEnumerable 的依赖关系：

container.RegisterType<IEnumerable<IActionDialogType>, IActionDialogType[]>();

由于 Unity 理解数组，您只需将可枚举对象映射到相同类型的数组即可。这将允许您 return 实例的可枚举。

那么您可以简单地执行以下操作：

public class ExampleController : Controller
{
     private readonly IEnumerable<IActionDialogType> actionDialogType;
     public ExampleController(IActionDialogType actionDialogType)
     {
         this.actionDialogType = actionDialogType;
     }

     public IActionResult Get()
     {
         foreach(IActionDialogType instance in actionDialogType)
         {
              // Should expose via each now.
              var name = instance.GetType().Name;
         }
     }
}

C# Unity 依赖注入，如何检索可枚举的实例？

C# Unity Dependency Injection, how can I retrieve an enumerable of instances?

c#

unity-container