我的应用程序有 10 个 WCFService(平台 .NET Framework 3.5 上的 WCFService 应用程序)具有相同的软件和硬件,但只有 1 个采用此例外:
当用户登录时调用此方法:
public IService Select(SelectServiceRequest request)
{
IAxxxService anagServ = IoC.Container.Resolve<IAxxxService>(request.GetRegisteredService().ToString());
return xxxServ;
}
使用 GetRegisteredService() 实现,第一次执行时 ClientIdentifier = 0
public RegisteredServices GetRegisteredService()
{
RegisteredServices res = RegisteredServices.Estxxx;
if (ClientIdentifier == 0)
{
res = RegisteredServices.Anaxxx;
}
else if (ClientIdentifier == 1)
{
res = RegisteredServices.Prixxx;
}
else if (ClientIdentifier == 2)
{
res = RegisteredServices.Estrxxx;
}
else if (ClientIdentifier == 3)
{
res = RegisteredServices.LixxAnagrxx;
}
return res;
}
具有 IOC 代码实现和初始化:
internal class IoC{
private static IUnityContainer container = new UnityContainer();
private static bool isInitialized = false;
public static IUnityContainer Container
{
get
{
if (!isInitialized)
{
lock (container)
{
if (!isInitialized)
container.RegisterType<IService, EstxxService>(RegisteredServices.Esxxxxx.ToString());
container.RegisterType<IService, StaxxxService>(RegisteredServices.Anaxxxx.ToString());
container.RegisterType<IService, PrixxxService>(RegisteredServices.Prixxxx.ToString());
container.RegisterType<IService, LixxxAxxxService>(RegisteredServices.LixxxAnagxx.ToString());
isInitialized = true;
}
}
}
return container;
}
}
}
我在执行方法“Resolve”上有这个例外:
System.Reflection.TargetInvocationException: 异常已被 由调用的目标抛出。 ---> Microsoft.Practices.Unity.ResolutionFailedException:依赖项解析失败,类型 = “ApCon.IService”,名称 = “Anagxxx”。异常信息是: 当前构建操作(构建密钥 Build Key[ApCon.StandardService, Anaxxxx])失败: 当前构建操作(构建密钥 Build Key[ApCon.StandardService, Anaxxxx])失败:索引在 数组的边界。 (策略类型 DynamicMethodConstructorStrategy,索引 0)(策略类型 BuildPlanStrategy,索引 3) ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: 当前构建操作(构建密钥 Build Key[ApCon.StandardService, Anagrafe])失败: 当前构建操作(构建密钥 Build Key[ApCon.StandardService, Anagrafe])失败:索引在 数组的边界。 (策略类型 DynamicMethodConstructorStrategy,索引 0)(策略类型 BuildPlanStrategy,索引 3) ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: 当前构建操作 (build key Build Key[ApCon.StandardService, Anagxxx]) 失败: 指数数组的边界之外。 (策略类型 DynamicMethodConstructorStrategy,索引 0) ---> System.IndexOutOfRangeException: 索引超出数组范围。在 System.Collections.Generic.List1.Add(T item) 在 Microsoft.Practices.ObjectBuilder2.DependencyResolverTrackerPolicy.AddResolverKey(对象 键)在 Microsoft.Practices.ObjectBuilder2.ConstructorSelectorPolicyBase`1.CreateSelectedConstructor(IBuilderContext context, ConstructorInfo ctor) 在 Microsoft.Practices.ObjectBuilder2.ConstructorSelectorPolicyBase1.SelectConstructor(IBuilderContext 上下文)在 Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.PreBuildUp(IBuilderContext 上下文)在 Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) --- 内部异常堆栈跟踪结束 --- 在
难道是锁指令?似乎类型没有注册并且 isInitialized 变成了 true
据我所知,您正在注册
IAnagrafeService
的命名实例,但试图解析 IService
. 的命名实例
我的猜测是第一个派生自第二个,所以这样的事情应该有效:
string name = request.GetRegisteredService().ToString();
IService anagServ = IoC.Container.Resolve<IAnagrafeService>(name);
(当然,您也可以更改 Unity 注册。)
我认为这与未注册的服务无关。这通常会抛出这个异常:
当前类型 IFoo 是一个接口,无法构造。是 你缺少类型映射吗?
可能是锁的结果。你可以试试这个模式:
public static class IocContainer
{
private static readonly Lazy<IUnityContainer> Container = new Lazy<IUnityContainer>(() =>
{
var container = new UnityContainer();
// Do your registrations.
container.RegisterType<IService, EstattoriService>(RegisteredServices.Estrattori.ToString());
container.RegisterType<IService, StandardService>(RegisteredServices.Anagrafica.ToString());
container.RegisterType<IService, PrivacyService>(RegisteredServices.Privacy.ToString());
container.RegisterType<IService, ListAnagService>(RegisteredServices.ListaAnagrafica.ToString());
return container;
});
public static IUnityContainer Instance
{
get { return Container.Value; }
}
}
如果那不是一个选项,您可以尝试不锁定容器本身:
internal class IoC{
private static IUnityContainer container = new UnityContainer();
private static bool isInitialized = false;
private static readonly object padlock = new object(); // lock object.
public static IUnityContainer Container
{
get
{
if (!isInitialized)
{
lock (padlock) // Lock on padlock instead.
{
if (!isInitialized)
container.RegisterType<IService, EstattoriService>(RegisteredServices.Estrattori.ToString());
container.RegisterType<IService, StandardService>(RegisteredServices.Anagrafica.ToString());
container.RegisterType<IService, PrivacyService>(RegisteredServices.Privacy.ToString());
container.RegisterType<IService, ListAnagService>(RegisteredServices.ListaAnagrafica.ToString());
isInitialized = true;
}
}
}
return container;
}
}
我发现这是单例模式的一个很好的来源。