Question

我正在尝试将Unity从版本3.0.1304.1升级到最新的5.11.1。毫不奇怪，这里有一些问题（3.0.1304.1已经很老了）。下面的代码完成了两件事：

对于从某个基本类X派生的所有类，请使用ContainerControlledLifetimeManager，而对于从X派生的每个类均不指定它。
在解析所有从基类Y派生的类时，请使用默认构造函数，而不必为从Y派生的每个类都指定它。

如今，统一文档稀缺且缺乏示例。我已经阅读了upgrade notes和常规文档，但无法在新版本中使用。

到目前为止，我有：

将IConstructorSelectorPolicy替换为ISelect<ConstructorInfo>
将IBuilderContext替换为BuilderContext（或PreBuildUp函数中的ref BuilderContext）

但是如何处理LifetimeManagerFactory？我应该从IOCConstructorSelectorPolicy派生ISelect<ConstructorInfo>，然后IOCConstructorSelectorPolicy.SelectConstructor替换为Select（根据ISelect接口），以及如何实现此Select函数？

我知道这是一个很长的镜头，我也将其发布在统一的github上（作为对各种文档的要求），但希望有人可以给我一些指导。

    /// <summary>
    /// This class merely exists for readability: avoid having to write the class it derives from.
    /// </summary>
    public class IOCConfigLifetimeExtension : DefaultLifetimeManagerExtension<ContainerControlledLifetimeManager, X>
    {}

    /// <summary>
    /// An IOC strategy to use a specific LifetimeManager (<typeparamref name="TLifetimeManager"/>) for subclasses of <typeparamref name="TBaseClass"/>.
    /// </summary>
    public class DefaultLifetimeManagerExtension<TLifetimeManager, TBaseClass> : UnityContainerExtension where TLifetimeManager : LifetimeManager, new()
    {
        protected override void Initialize()
        {
            var theFactory = new LifetimeManagerFactory(Context, typeof(TLifetimeManager));
            Context.Strategies.Add(new DefaultLifetimeManagerStrategy(theFactory, TypePredicate), UnityBuildStage.TypeMapping);
        }

         private bool TypePredicate(Type type)
         {
             return typeof (TBaseClass).IsAssignableFrom(type);
         }
    }

    public class DefaultLifetimeManagerStrategy : BuilderStrategy
    {
        public DefaultLifetimeManagerStrategy(LifetimeManagerFactory factory, Predicate<Type> typePredicate)
        {
            mFactory = factory;
            mTypePredicate = typePredicate;
        }

        public override void PreBuildUp(IBuilderContext context)
        {
            if (context.Existing == null) {
                var theLifetime = context.Policies.GetNoDefault<ILifetimePolicy>(context.BuildKey, false);

                if (theLifetime == null && mTypePredicate(context.BuildKey.Type)) {
                    theLifetime = mFactory.CreateLifetimePolicy();
                    context.PersistentPolicies.Set(theLifetime, context.BuildKey);
                }
            }
        }
        private readonly LifetimeManagerFactory mFactory;
        private readonly Predicate<Type> mTypePredicate;
    }

    /// <summary>
    /// A Unity extension that prioritizes the default constructor for classes derived of Y when available, otherwise the default resolve method is used.
    /// </summary>
    public class IOCExtension : UnityContainerExtension
    {
        protected override void Initialize()
        {
            var theDefaultConstructorSelectorPolicy = Context.Policies.Get<IConstructorSelectorPolicy>(null);
            Context.Policies.SetDefault<IConstructorSelectorPolicy>(new IOCConstructorSelectorPolicy(theDefaultConstructorSelectorPolicy));
        }

        public class IOCConstructorSelectorPolicy : IConstructorSelectorPolicy
        {
            public IOCConstructorSelectorPolicy(IConstructorSelectorPolicy defaultConstructorSelectorPolicy)
            {
                mDefaultConstructorSelectorPolicy = defaultConstructorSelectorPolicy;
            }

            public SelectedConstructor SelectConstructor(IBuilderContext context, IPolicyList resolverPolicyDestination)
            {
                Type theType = context.BuildKey.Type;
                if (typeof(DataNode).IsAssignableFrom(theType)) {
                    ConstructorInfo theDefaultConstructorInfo = theType.GetConstructor(Type.EmptyTypes);
                    if (theDefaultConstructorInfo != null && theDefaultConstructorInfo.IsPublic) {
                        return new SelectedConstructor(theDefaultConstructorInfo);
                    }
                }
                return mDefaultConstructorSelectorPolicy.SelectConstructor(context, resolverPolicyDestination);
            }

            private readonly IConstructorSelectorPolicy mDefaultConstructorSelectorPolicy;
        }
    }

将Unity升级到5.11.1

0 个答案: