Inject same interface in some class but different interface implementation


Class example

interface IValidator
{
    void Validate(object obj);
}

public class ValidatorA : IValidator
{
    public void Validate(object obj) { }
}

public class ValidatorB : IValidator
{
    public void Validate(object obj) { }
}

interface IClassA { }
interface IClassB { }

public class MyBaseClass
{
    protected IValidator validator;

    public void Validate()
    {
        validator.Validate(this);
    }
}

public class ClassA : MyBaseClass, IClassA
{
    //problem: validator should ValidatorA
    public ClassA(IValidator validator) { }
}

public class ClassB : MyBaseClass, IClassB
{
    //problem: validator should ValidatorB
    public ClassB(IValidator validator) { }
}

public class OtherClass
{
    public OtherClass(IClassA a, IClassB b) { }
}

//on Main
var oc = container.Resolve<OtherClass>();

DI Solutions

var container = new WindsorContainer();

container.Register(Component.For<IClassA>().ImplementedBy<ClassA>()
    .DependsOn(ServiceOverride.ForKey<IValidator>().Eq("ValidatorA")));
container.Register(Component.For<IClassB>().ImplementedBy<ClassB>()
    .DependsOn(ServiceOverride.ForKey<IValidator>().Eq("ValidatorB")));

container.Register(Component.For<IValidator>().ImplementedBy<ValidatorA>()
    .Named("ValidatorA"));
container.Register(Component.For<IValidator>().ImplementedBy<ValidatorB>()
    .Named("ValidatorB"));

container.Register(Component.For<OtherClass>().ImplementedBy<OtherClass>());

var oc = container.Resolve<OtherClass>();

Reference

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