CODEWITHSUNDEEP
.netdependency-injectionstructuremap
jbenckert
jbenckert

Reputation: 964

StructureMap and named instances

I'm not sure why the following doesn't work. StructureMap tells me there is no default dependency defined for SomeClassWithDependencies...um...dependencies. Can anyone shed any light on this? I want to construct the object through the entire dependency tree based on the named instances. Am I barking up the wrong tree?

public class Program
{
    static void Main(string[] args)
    {
        ObjectFactory.Initialize(x=>x.AddRegistry(new MyRegistry()));


        ISomeClassWithDependencies someClassWithDependencies = ObjectFactory.GetNamedInstance<ISomeClassWithDependencies>("name1");
    }
}
public interface ISomeClassWithDependencies
{
}

public class SomeClassWithDependencies : ISomeClassWithDependencies
{
    public IEnumerable<IValidator> Validators { get; private set; }

    public SomeClassWithDependencies(IEnumerable<IValidator> type1s)
    {
        Validators = type1s;
    }
}

public class MyRegistry : Registry
{
    public MyRegistry()
    {
        ForRequestedType<ISomeClassWithDependencies>().AddInstances(
            x => x.Is.OfConcreteType<SomeClassWithDependencies>().WithName("name1"));
        ForRequestedType<IEnumerable<IValidator>>().AddInstances(x=>x.ConstructedBy(BuildValidators).WithName("name1"));
        ForRequestedType<IEnumerable<IValidator>>().AddInstances(x => x.ConstructedBy(BuildValidators2).WithName("name2"));
    }

    public IEnumerable<IValidator> BuildValidators()
    {
        var validatorOne = ObjectFactory.GetInstance<Validator1>();
        var validatorTwo = ObjectFactory.GetInstance<Validator2>();

        return new List<IValidator> { validatorOne, validatorTwo };
    }

    public IEnumerable<IValidator> BuildValidators2()
    {
        var validatorOne = ObjectFactory.GetInstance<Validator1>();

        return new List<IValidator> { validatorOne };
    }
}

Upvotes: 0

Views: 912

Answers (1)

PHeiberg
PHeiberg

Reputation: 29811

Firstly you have named two different instances to "name1", secondly IEnumerables, arrays, and IList/List<T>s are treated specially by StructureMap and calls to for example Ctor<IEnumerable<T>>() are ignored.

You could use (only) this in your registry (2.6.1 syntax):

For<ISomeClassWithDependencies>().Use<SomeClassWithDependencies>()
            .EnumerableOf<IValidator>("type1s").Contains(
            x =>
                {
                    x.Type<Validator1>();
                    x.Type<Validator2>();
                }
            );

and create the instance using

var someClassWithDependencies =
            ObjectFactory.GetInstance<ISomeClassWithDependencies>();

Upvotes: 1

Related Questions