Unity get注入依赖项的服务类型 [英] Unity get Type of the service where the dependecy gets injected

问题描述

是否可以在Unity中获得注入依赖项的服务类型?

Is it possible to get, in Unity, the Type of the service where the dependecy gets injected?

在Ninject中，您可以这样操作:

In Ninject you can do it like this:

kernel.Bind<ILogger>().ToMethod((context) =>
{
    ILogger logger = HttpContextLoggerFactory.GetInstance();

    // Eg: MyApplication.PeopleRepository
    string memberType = context?.Request?.Target?.Member?.DeclaringType?.FullName;

    return new LoggerMemberTypeDecorator(logger, memberType);
});

如何在Unity中实现相同的功能?

How can the same thing be implemented in Unity?

这是我所拥有的，但我无权访问任何context

Here is what i have, but i do not have access to any context

container.RegisterType<ILogger>(new InjectionFactory(u =>
{
    ILogger logger = HttpContextLoggerFactory.GetInstance();

    // how to get it?
    string memberType = "";

    return new LoggerMemberTypeDecorator(logger, memberType);
});

推荐答案

您必须使用特殊的InjectionConstructor注册您的Service(其类型然后被报告给注入的依赖项的构造函数).

You have to register your Service (whose type then gets reported to the injected dependency's constructor) with a special InjectionConstructor.

无耻地复制自己的答案(请参阅详细信息

Shamelessly copying my own answer (see details here):

container.RegisterType<IInterface, Implementation>( new MyInjectionConstructor() );

internal class MyInjectionConstructor : InjectionMember
{
    public override void AddPolicies( Type serviceType, Type implementationType, string name, IPolicyList policies )
    {
        policies.Set<IConstructorSelectorPolicy>( new MyConstructorSelectorPolicy(), new NamedTypeBuildKey( implementationType, name ) );
    }
}

internal class MyConstructorSelectorPolicy : DefaultUnityConstructorSelectorPolicy
{
    protected override IDependencyResolverPolicy CreateResolver( ParameterInfo parameter )
    {
        if( parameter.ParameterType == typeof( ILogger ) )
        {
            return new LiteralValueDependencyResolverPolicy( new Logger( parameter.Member.DeclaringType ) );
        }
        return base.CreateResolver( parameter );
    }
}

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