.net - 在 Windsor 中注册通用装饰器

Question

这个问题在这里已经有了答案:





How can I register a generic decorator using Castle Windsor?

(2 个回答)


6年前关闭。




我有一个看起来像这样的界面:

public interface IQueryHandler<in TQuery, out TResult>
    where TQuery : IQuery<TResult>
{
    TResult Handle(TQuery query);
}

我想用这个缓存装饰器包装我的所有处理程序:

public class CachingQueryHandler<TQuery, TResult>
    : IQueryHandler<TQuery, TResult>
    where TQuery : IQuery<TResult>
{
    public CachingQueryHandler(
        IQueryHandler<TQuery, TResult> handler,
        IQueryCachingRule<TQuery, TResult> cachingRule,
        ITaggedCacheProvider cache)
    {
        //...
    }

    //...
}

这就是我在 Windsor 中注册组件的方式:

container.Register(
    Component
        .For(typeof(IQueryHandler<,>))
        .ImplementedBy(typeof(CachingQueryHandler<,>)),
    Classes
        .FromAssemblyContaining<GetUserCourseStatesHandler>()
        .BasedOn(typeof(IQueryHandler<,>))
        .WithServiceBase()
)

在几篇文章中，我读到 Windsor 可以自动连接装饰器链，如果所有组件都按有效顺序注册。但就我而言，温莎只是忽略了我的 CachingQueryHandler当我试图解决任何 IQueryable<,> 时注册.
在名为 Potentially Misconfigured Components 的容器的私有(private)字段中我发现了这个警告:

Some dependencies of this component could not be statically resolved. IGSystems.Common.CQRS.CachingQueryHandler'2 is waiting for the following dependencies: - Service 'IQueryHandler'2' which points back to the component itself. A dependency cannot be satisfied by the component itself, did you forget to register other components for this service?

Answer 1

好吧，如果您希望您的缓存查询处理程序装饰您的实际实现，您应该重新排序您的注册。

container.Register(
    Classes
        .FromAssemblyContaining<GetUserCourseStatesHandler>()
        .BasedOn(typeof(IQueryHandler<,>))
        .WithServiceBase(),
Component
        .For(typeof(IQueryHandler<,>))
        .ImplementedBy(typeof(CachingQueryHandler<,>))
)