OK,在这个没有得到很多信息后,我看了一下团结内部,因为我看不到这样做的任何公开方式。我提出了以下使用Reflection来访问Unity各个部分的私有成员。
这样做的主要原因是将瞬态实例注入到单例中是有点不匹配的。瞬间应该只能持续很短的时间,而单身可能在DI容器的整个生命周期中保持不变。关于简单注射器here有一些很好的信息。这是尝试获取注入信息的原因之一,因为Unity没有像简单注入器那样的验证。
所以,这里是我正在注册的服务接口和类。有3个接口和3个具体实现,但有2个实现的IService2除外。
public class Service1 : IService1
{
private readonly IService2 _service2;
private readonly IService3 _service3;
public Service1(IService2 service2, IService3 service3)
{
_service2 = service2;
_service3 = service3;
}
public int DoSomethingForService1()
{
return 1;
}
}
public interface IService1
{
int DoSomethingForService1();
}
public class Service2 : IService2
{
public int DoSomethingForService2()
{
return 1;
}
}
public class Service3 : IService3
{
public int DoSomethingForService3()
{
return 1;
}
}
public interface IService3
{
int DoSomethingForService3();
}
public class Service2_1 : IService2
{
public int DoSomethingForService2()
{
return 1;
}
}
public interface IService2
{
int DoSomethingForService2();
}
现在Unity容器已经建成。我们倾向于为此使用单独的项目,因为我们不希望所有引用都保存在UI中。我们正在使用2个名为IService2的注册。
public static class UnityContainerBuilder
{
public static IUnityContainer BuildDirectInUnity()
{
IUnityContainer container = new UnityContainer();
container.RegisterType<IService2, Service2>("Service2OneAndOnly", new ContainerControlledLifetimeManager());
container.RegisterType<IService2, Service2_1>("Service2_1", new ContainerControlledLifetimeManager());
container.RegisterType<IService3, Service3>(new ContainerControlledLifetimeManager());
container.RegisterType<IService1, Service1>(new ContainerControlledLifetimeManager(),
new InjectionConstructor(
new ResolvedParameter<IService2>("Service2OneAndOnly"),
new ResolvedParameter<IService3>()));
}
}
现在有趣的部分。在这里,我们得到了统一配置:
static void Main(string[] args)
{
Console.WriteLine("Building Unity Container...");
var container = (UnityContainer)UnityContainerBuilder.BuildDirectInUnity();
Console.WriteLine("Listing Registrations...");
FieldInfo policiesField = typeof(UnityContainer).GetFields(
BindingFlags.NonPublic |
BindingFlags.Instance).First(f => f.Name == "policies");
FieldInfo parameterValuesField = typeof(SpecifiedConstructorSelectorPolicy).GetFields(
BindingFlags.NonPublic |
BindingFlags.Instance).First(f => f.Name == "parameterValues");
FieldInfo paramNameField = typeof(ResolvedParameter).GetFields(
BindingFlags.NonPublic |
BindingFlags.Instance).First(f => f.Name == "name");
var policies = (PolicyList)policiesField.GetValue(container);
// build up a dictionary for loop below to use to get the lifetime manager
var typeToRegistration = new Dictionary<Tuple<Type, string>, ContainerRegistration>();
foreach (ContainerRegistration registration in container.Registrations)
{
typeToRegistration.Add(new Tuple<Type, string>(registration.RegisteredType, registration.Name), registration);
}
// now output the list
foreach (ContainerRegistration registration in container.Registrations)
{
Console.WriteLine("{0} to {1}, {2}, {3}",
registration.RegisteredType.Name,
registration.MappedToType.Name,
registration.Name ?? "[default]",
registration.LifetimeManagerType.Name);
// need to check for our InjectionConstructor - I need local = false
IConstructorSelectorPolicy constructorPolicy = policies.Get<IConstructorSelectorPolicy>(
new NamedTypeBuildKey(registration.MappedToType, registration.Name), false);
// and I need SpecifiedConstructorSelectorPolicy as we are not using the default constructor
if (constructorPolicy is SpecifiedConstructorSelectorPolicy)
{
var specifiedConstructorPolicy = constructorPolicy as SpecifiedConstructorSelectorPolicy;
// now output the ResolvedParameters for type, name, lifetime manager
var paramValues = (InjectionParameterValue[])parameterValuesField.GetValue(specifiedConstructorPolicy);
foreach (var param in paramValues)
{
if (param is ResolvedParameter)
{
var resolvedParam = param as ResolvedParameter;
var name = (string)paramNameField.GetValue(resolvedParam);
string lifeTimeManagerName =
typeToRegistration[new Tuple<Type, string>(resolvedParam.ParameterType, name)].LifetimeManagerType.Name;
Console.WriteLine("\t{0}, {1}, {2}", param.ParameterTypeName, name ?? "[default]", lifeTimeManagerName);
}
else
{
Console.WriteLine("\t{0}", param.ParameterTypeName);
}
}
}
}
Console.WriteLine("Complete");
Console.ReadLine();
}
这样做的缺点是,它是纯粹基于反射黑客攻击,它不支持InjectionFactory在那里你可以配置类型的新实例。
@Nikolia - 我遇到过那一个。它基本上显示了你有什么类型的映射和终身管理器。我想知道我用InjectionConstructors配置了什么。这篇文章没有涉及。 – Andez