CODEWITHSUNDEEP
c#.netunity-containerwcfserviceclient
Dilo
Dilo

Reputation: 1

Unity + C# - "Resolution of the dependency failed"

My application have a 10 WCFService ( WCFService Application on platform .NET Framework 3.5) with same software and hardware but only 1 takes this exception:

When user is logged in invoke this method: 

  public IService Select(SelectServiceRequest request)
        {
            IAxxxService anagServ = IoC.Container.Resolve<IAxxxService>(request.GetRegisteredService().ToString());
            return xxxServ;
        }

i have this exception on execution method "Resolve":

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Microsoft.Practices.Unity.ResolutionFailedException: Resolution of the dependency failed, type = "ApCon.IService", name = "Anagxxx". Exception message is: The current build operation (build key Build Key[ApCon.StandardService, Anaxxxx]) failed: The current build operation (build key Build Key[ApCon.StandardService, Anaxxxx]) failed:Index was outside the bounds of the array. (Strategy type DynamicMethodConstructorStrategy, index 0) (Strategy type BuildPlanStrategy, index 3) ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: The current build operation (build key Build Key[ApCon.StandardService, Anagrafe]) failed: The current build operation (build key Build Key[ApCon.StandardService, Anagrafe]) failed: Index was outside the bounds of the array. (Strategy type DynamicMethodConstructorStrategy, index 0) (Strategy type BuildPlanStrategy, index 3) ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: The current build operation (build key Build Key[ApCon.StandardService, Anagxxx]) failed: Index was outside the bounds of the array. (Strategy type DynamicMethodConstructorStrategy, index 0) ---> System.IndexOutOfRangeException: Index was outside the bounds of the array. at System.Collections.Generic.List1.Add(T item) at Microsoft.Practices.ObjectBuilder2.DependencyResolverTrackerPolicy.AddResolverKey(Object key) at Microsoft.Practices.ObjectBuilder2.ConstructorSelectorPolicyBase`1.CreateSelectedConstructor(IBuilderContext context, ConstructorInfo ctor) at Microsoft.Practices.ObjectBuilder2.ConstructorSelectorPolicyBase1.SelectConstructor(IBuilderContext context) at Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.PreBuildUp(IBuilderContext context) at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) --- End of inner exception stack trace --- at

Could it be the lock instruction? It seems that types weren't registered and isInitialized becomed true

Upvotes: 0

Views: 8541

Answers (2)

smoksnes
smoksnes

Reputation: 10851

I don't think it's related to the services not being registered. That usually throws this Exception:

The current type, IFoo, is an interface and cannot be constructed. Are you missing a type mapping?

It can be a result of the lock. You can try this pattern instead:

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; }
    }
}

If that's not an option, you can try to not lock the container itself:

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;
    }
}

I find this a good source for the singleton pattern.

http://csharpindepth.com/Articles/General/Singleton.aspx

Upvotes: 0

Petter Hesselberg
Petter Hesselberg

Reputation: 5498

Near as I can tell, you're registering named instances of IAnagrafeService, but trying to resolve a named instance of IService.

My guess would be that the first derives from the second, so something like this should work:

string name = request.GetRegisteredService().ToString();
IService anagServ = IoC.Container.Resolve<IAnagrafeService>(name);

(Or you could change the Unity registration, of course.)

Upvotes: 0

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