Unity Dependency Injection Resolve returning System.NullReferenceException

Question

I'm trying to "resolve" a class using Unity Dependency Injection, but Unity always returns me System.NullReferenceException

private IUnityContainer _unityContainer { get; set; }
public void myMethod()
{
    _unityContainer = UnityContainer.UnityContainerConfig.Initialize();
    IMyclass ObjMyClass = _unityContainer.Resolve<IMyclass >();
    ObjMyClass .Init();
}

My container:

public class UnityContainerConfig
{
    public static IUnityContainer _unityContainer = null;

    public static IUnityContainer Initialize()
    {
        if (_unityContainer == null)
        {
            _unityContainer = new Microsoft.Practices.Unity.UnityContainer()
            .RegisterType<IRepository<Table1>, Table1Repository>(new HttpContextLifetimeManager<IRepository<Table1>>())
            .RegisterType<IRepository<Table2>, Table2Repository>(new HttpContextLifetimeManager<IRepository<Table2>>())
            .RegisterType<IRepository<Table3>, Table3Repository>(new HttpContextLifetimeManager<IRepository<Table3>>())
            .RegisterType<IRepository<Table4>, Table4Repository>(new HttpContextLifetimeManager<IRepository<Table4>>())
            .RegisterType<IMyclass, MyClass>(new HttpContextLifetimeManager<IMyclass>());
        }
    }
        return unityContainer;
}

There are 4 parameters in "my class" constructor which receives the "4 tables as repository"

Which line throws the exception?

Yacoub Massad
– Yacoub Massad

2016-08-23 20:16:01 +00:00
Commented Aug 23, 2016 at 20:16 — Yacoub Massad
– Yacoub Massad, Commented Aug 23, 2016 at 20:16
IMyclass ObjMyClass = _unityContainer.Resolve<IMyclass>();

Mario Guadagnin
– Mario Guadagnin

2016-08-24 19:14:44 +00:00
Commented Aug 24, 2016 at 19:14 — Mario Guadagnin
– Mario Guadagnin, Commented Aug 24, 2016 at 19:14

Mario Guadagnin · Accepted Answer · 2016-08-23 21:06:51Z

1

The problem have been solved.

I had to re-install the unity (nuget), install UnityOfWork and register the "UnityOfWork class"

answered Aug 23, 2016 at 21:06

Mario Guadagnin

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