Part of this question was already asked here : structuremap Property Injection but the answer was never given.
With StructureMap, is it possible to do Property Injection such that
class SomeController : Controller
{
public IService Service
{
get;
set;
}
}
gets injected properly? I am a
StructureMap supports setter/property injection. So you could do the following:
public class SomeController : Controller
{
[SetterProperty]
public IService Service { get; set; }
}
and then:
ObjectFactory.Initialize(x =>
{
x.For<IService>()
.Use<ServiceImpl>();
});
or if you don't like the idea of cluttering your controllers with StructureMap specific attributes you could configure it like this:
ObjectFactory.Initialize(x =>
{
x.For<IService>()
.Use<ServiceImpl>();
x.ForConcreteType<SomeController>()
.Configure
.Setter<IService>(c => c.Service)
.IsTheDefault();
});
Also note that property injection is suitable in scenarios where the presence of this property is not compulsory for the correct functioning of the controller. For example think of a logger. If the consumer of the controller doesn't inject any specific implementation of a logger into the property the controller still works it's just that it doesn't log. In your case you are using a service and I would use constructor injection if your controller actions depend on this service. So the question you should ask yourself is: will my controller crash when I call some its action if this property is null
? If the answer to this question is yes then I would recommend constructor injection. Also when you use a constructor injection you force the consumer of this controller to specify an implementation because he cannot obtain an instance of the controller without passing a proper service in the constructor.
To inject dependencies for all properties of a certain type, use the SetAllProperties method as part of the initialization of your ObjectFactory:
ObjectFactory.Initialize(x =>
{
x.SetAllProperties(x => x.OfType<IService>());
});
It is also possible to define policies for setter injection, see this post.
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