CODEWITHSUNDEEP
c#dependency-injectionninject
Ilya Chumakov
Ilya Chumakov

Reputation: 25039

Interceptor breaks property injection

I use Ninject. The injected property of self-binded class is not resolved when the class has an interceptor. Up-to-date libraries are used:

  <package id="Castle.Core" version="3.2.0" targetFramework="net46" />
  <package id="Ninject" version="3.2.0.0" targetFramework="net46" />
  <package id="Ninject.Extensions.Interception" version="3.2.0.0" targetFramework="net46" />
  <package id="Ninject.Extensions.Interception.DynamicProxy" version="3.2.0.0" targetFramework="net46" />

Foo class is self-binded:

public class Foo
{
    [Inject]
    public IBar Bar { get; set; }
}

public interface IBar
{
    void MyMethod();
}

public class Bar : IBar
{
    public void MyMethod() { }
}

The interceptor:

public class TestInterceptor : IInterceptor
{
    public void Intercept(IInvocation invocation)
    {
        invocation.Proceed();
    }
}

And two tests:

[Test]
public void Test1()
{
    var kernel = new StandardKernel();

    kernel.Bind<IBar>().To<Bar>();
    kernel.Bind<Foo>().ToSelf();

    var foo = kernel.Get<Foo>();

    Assert.IsNotNull(foo.Bar);
}

[Test]
public void Test2()
{
    var kernel = new StandardKernel();

    kernel.Bind<IBar>().To<Bar>();
    kernel.Bind<Foo>().ToSelf().Intercept().With<TestInterceptor>(); //the only diff

    var foo = kernel.Get<Foo>();

    Assert.IsNotNull(foo.Bar);
}

Test1 is successful. Test2 fails. Why? Is it expected behavior?

Upvotes: 1

Views: 83

Answers (1)

Yacoub Massad
Yacoub Massad

Reputation: 27871

It would work if you make the Bar property virtual like this:

public class Foo
{
    [Inject]
    public virtual IBar Bar { get; set; }
}

Upvotes: 1

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