Property injection with Unity - c#-4.0

Question

i encoutered problem with unity, i want to use property injection, here is what i had in my code :
config of the container :
public static void RegisterTypes(IUnityContainer container)
{
container.RegisterType<GTModelContainer, GTModelContainer>(new HttpContextLifetimeManager<GTModelContainer>())
.RegisterType<IUnitOfWork, UnitOfWorkGT>()
.RegisterType<ILogger, Logger>(new ContainerControlledLifetimeManager())
.RegisterType<ISocieteServices, SocieteServices>() ;
}
SocieteService Class :
public class SocieteServices : ISocieteServices
{
private IUnitOfWork UnitOfWork;
public SocieteServices(IUnitOfWork unitOfWork)
{
UnitOfWork = unitOfWork;
}
}
i tried to use property injection (i can't use constructor injection with custom data annotation) and here what i had done :
public class CodeSocieteUniqueAttribute : ValidationAttribute
{
[Dependency]
public ISocieteServices SocieteService {get; set;}
[InjectionMethod]
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
string codeSociete = value as string;
var societe = SocieteService.getSocieteByCode(codeSociete);
if (societe == null) return ValidationResult.Success;
else return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
}
}
the problem is that the societeService in CodeSocieteUniqueAttribute class is not injected.

Answer 1

Assuming that your class for registering types is publicly accessible and has a IUnityContainer object, ie:
public static class Resolver
{
public static IUnityContainer Container { get; set; }
public static void RegisterTypes(IUnityContainer container)
{
// type registrations here
container.RegisterType<GTModelContainer, GTModelContainer>(new HttpContextLifetimeManager<GTModelContainer>())
.RegisterType<IUnitOfWork, UnitOfWorkGT>()
.RegisterType<ILogger, Logger>(new ContainerControlledLifetimeManager())
.RegisterType<ISocieteServices, SocieteServices>() ;
// Now, set the container
Container = container;
}
}
You could access the container you've built up and resolve these types during method execution.
For instance,
public class CodeSocieteUniqueAttribute : ValidationAttribute
{
[Dependency]
public ISocieteServices SocieteService { get; set; }
[InjectionMethod]
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var societeServices = Resolver.Container.Resolve<ISocieteServices>();
SocieteService = societeServices; // Or, you know, just use this since it's resolved.
string codeSociete = value as string;
var societe = SocieteService.getSocieteByCode(codeSociete);
if (societe == null) return ValidationResult.Success;
else return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
}
}
This is actually pretty standard practice, and this MSDN article describes resolving items during runtime.
Another option is to pop the resolution into a default constructor like this:
public class CodeSocieteUniqueAttribute : ValidationAttribute
{
[Dependency]
public ISocieteServices SocieteService {get; set;}
public CodeSocieteUniqueAttribute()
{
var societeServices = Resolver.Container.Resolve<ISocieteServices>();
SocieteService = societeServices;
}
// the rest of the class omitted for brevity
}