使用默认参数注入构造函数时出现问题。
例如
container.RegisterType<IAddressImportRepository, AddressImportRepository>(
new PerRequestLifetimeManager());
public AddressImportRepository(
FairFlexxDbContext context, bool isUseSecurePredicate = true)
: base(context, isUseSecurePredicate)
{
}
错误:
[InvalidOperationException:布尔类型没有 可访问的构造函数。]
Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.ThrowForNullExistingObject(IBuilderContext 上下文)+239 lambda_method(Closure,IBuilderContext)+60
Microsoft.Practices.ObjectBuilder2&LT;&GT; c__DisplayClass1.b__0(IBuilderContext 上下文)+71
Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext 上下文)+42
Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext 上下文)+333
Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext 上下文)+274
Microsoft.Practices.ObjectBuilder2.BuilderContext.NewBuildUp(NamedTypeBuildKey newBuildKey)+167
Microsoft.Practices.Unity.ObjectBuilder.NamedTypeDependencyResolverPolicy.Resolve(IBuilderContext 上下文)+101 lambda_method(Closure,IBuilderContext)+425
Microsoft.Practices.ObjectBuilder2&LT;&GT; c__DisplayClass1.b__0(IBuilderContext 上下文)+71
Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext 上下文)+42
Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext 上下文)+333
Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext 上下文)+274
Microsoft.Practices.ObjectBuilder2.BuilderContext.NewBuildUp(NamedTypeBuildKey newBuildKey)+167
Microsoft.Practices.Unity.ObjectBuilder.NamedTypeDependencyResolverPolicy.Resolve(IBuilderContext 上下文)+101 lambda_method(Closure,IBuilderContext)+222
Microsoft.Practices.ObjectBuilder2&LT;&GT; c__DisplayClass1.b__0(IBuilderContext 上下文)+71
Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext 上下文)+42
Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext 上下文)+333
Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext 上下文)+274
Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t,Object existing,String name,IEnumerable`1 resolverOverrides)+383
答案 0 :(得分:9)
Unity使用反射来确定构造函数参数类型。使用构造函数,它找到了参数FairFlexxDbContext和bool。它试图构造每种类型的实例并在bool上失败,因为它是一个值类型。它无法识别您提供的默认值以通过此错误。
要实现这一点,您有几个选择。要么使用InjectionConstructor
告诉注册表IAddressImportRepository
并告诉 如何解析构造函数参数,要么将bool参数移动为属性。由于bool是一个可选参数,我建议将其移动为属性。
container.RegisterType<IAddressImportRepository, AddressImportRepository>(
new PerRequestLifetimeManager(),
new InjectionConstructor(new ResolvedParameter<FairFlexxDbContext>(), true));
或
public AddressImportRepository(FairFlexxDbContext context)
: base(context, true)
{
IsUseSecurePredicate = true;
}
public bool IsUseSecurePredicate { get; set; }