无法解析控制器

Question

以前我没有为我的通用存储库使用接口。当我从通用存储库中提取接口时，我添加了两个构造函数：无参数构造函数和参数化构造函数，我收到以下错误：

{"Resolution of the dependency failed, type = \"NascoBenefitBuilder.Controllers.ODSController\", name = \"(none)\".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The current type, ControllerLib.Models.Generic.IGenericRepository, is an interface and cannot be constructed. Are you missing a type mapping?
-----------------------------------------------
At the time of the exception, the container was:
Resolving NascoBenefitBuilder.Controllers.ODSController,(none)
Resolving parameter \"repo\" of constructor NascoBenefitBuilder.Controllers.ODSController(ControllerLib.Models.Generic.IGenericRepository repo)
Resolving ControllerLib.Models.Generic.IGenericRepository,(none)"}

开头的我的控制器：

public class ODSController : ControllerBase
{   
    IGenericRepository _generic = new GenericRepository();
}

提取接口并在控制器中使用它后：

public class ODSController : ControllerBase
{
    IGenericRepository _generic;
    public ODSController() : this(new GenericRepository())
    {
    }

    public ODSController(IGenericRepository repo)
    {
        _generic = repo;
    }
}

当我使用参数化构造函数时正在抛出上面提到的错误。

谁能帮助我克服这个问题？

Answer 1

您不再需要默认构造函数：

public class ODSController : ControllerBase
{
    private readonly IGenericRepository _repository;
    public ODSController(IGenericRepository repository)
    {
        _repository = repository;
    }
}

然后确保您已正确配置 Unity 容器：

IUnityContainer container = new UnityContainer()
    .RegisterType<IGenericRepository, GenericRepository>();

并且您在 Application_Start 中使用 Unity 控制器工厂：

ControllerBuilder.Current.SetControllerFactory(typeof(UnityControllerFactory));