Question

我有一个通用的存储库接口，

IRepositroy<T>

抽象基类：

public abstract class RepositoryBase
{
    protected readonly IDbContextFactory _dbContextFactory;
    protected readonly IUnitOfWork _unitOfWork;

    protected RepositoryBase(IDbContextFactory dbContextFactory, IUnitOfWork uow)
    {
        this._dbContextFactory = dbContextFactory;
        _unitOfWork = uow;
    }
}

然后我有实现这些接口的具体存储库类

public class CarRepo : RepositoryBase, IRepository<Car> ...

我试图将这些注入到我的WebApi控制器中，但是没有成功。

我收到错误消息，说我没有无参数的ctor，并且无法将CarRepo强制转换为IRepository。

在我的容器配置中，我有：

container.RegisterType(typeof(IRepository<>), typeof(CarRepo));

以下是我在尝试导航到该控制器方法时得到的结果：

{＆＃34;消息＆＃34;：＆＃34;发生错误。＆＃34;，＆＃34; ExceptionMessage＆＃34;：＆＃34;尝试创建控制器时发生错误键入＆＃39; CarController＆＃39;。确保控制器具有无参数的公共构造函数。＆＃34;，＆＃34; ExceptionType＆＃34;：＆＃34; System.InvalidOperationException＆＃34;，＆＃34; StackTrace＆＃34;：＆＃34;在System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create（HttpRequestMessage请求，HttpControllerDescriptor controllerDescriptor，类型controllerType）\ r \ n在System.Web.Http.Controllers.HttpControllerDescriptor.CreateController（HttpRequestMessage请求）\ r \ n在System.Web上.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext（）＆＃34;，＆＃34; InnerException＆＃34;：{＆＃34; Message＆＃34;：＆＃34;发生错误。＆＃34;，＆＃34; ExceptionMessage＆＃34;：＆＃34;依赖关系的解析失败，输入= \＆＃34; CarController \＆＃34;，name = \＆＃34;（none）\＆＃34;。\ r \ n发生异常时：解析参数\＆＃34; repository \＆＃34;构造函数CareController（IRepository 1[[CarRepository, DAL, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] repository).\r\nException is: InvalidCastException - Unable to cast object of type 'CarRepository' to type 'IRepository 1 [Repository]＆＃39;。\ r \ n --------------------------- -------------------- \ r \ n在异常时，容器是：\ r \ n \ r \ n解析CarController，（无）\ r \ n \ n解析参数\＆＃34;存储库\＆＃34;构造函数CarController（IRepository 1[[CarRepository, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] repository)\r\n","ExceptionType":"Microsoft.Practices.Unity.ResolutionFailedException","StackTrace":" at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name, IEnumerable 1 resolverOverrides）\ r \ n在Microsoft.Practices.Unity.UnityContainer.Resolve（Type t，String name，ResolverOverride） [] resolverOverrides）\ r \ n在Microsoft.Practices.Unity.UnityContainerExtensions.Resolve（IUnityContainer容器，Type t，ResolverOverride []覆盖）\ r \ n在Unity.WebApi.UnityDependencyScope.GetService（类型serviceType）\ r \ n在System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator（HttpRequestMessage请求，输入controllerType，Func 1& activator)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)","InnerException":{"Message":"An error has occurred.","ExceptionMessage":"Unable to cast object of type 'CarRepository' to type 'IRepository 1 [CarRepository]＆＃39;。＆＃34;，＆＃34; ExceptionType＆＃34;：＆＃ 34; System.InvalidCastException＆＃34;，＆＃34; StackTrace＆＃34;：＆＃34;在lambda_method（Closure，IBuilderContext）\ r \ n在Microsoft.Practices.ObjectBuilder2.DynamicBuildP lanGenerationContext。＆lt;＆gt; c__DisplayClass1.b__0（IBuilderContext context）\ r \ n at Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp（IBuilderContext context）\ r \ n at Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp（IBuilderContext context）\ r \ n at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp（IBuilderContext context）\ r \ n at Microsoft.Practices.Unity.UnityContainer.DoBuildUp（Type t，Object existing，String name，IEnumerable`1 resolverOverrides）＆＃34; }}}

Answer 1

由NightOwl888复制的评论中的帖子略有不同，但它显示了正在执行的操作的正确实现。您需要RepositoryBase类中的构造函数。（public RepositoryBase（）{}）

这基本上可以确保您的抽象类具有默认实现。

统一通用接口和具体类

1 个答案: