Autofac 中的协方差？

发布于 2024-11-25 05:58:25 字数 1030 浏览 1 评论 0原文

我正在使用 AutoFAC 2.2.4，并且对容器解析中的协方差有疑问。

我的存储库有一个基本接口定义：

IRepository<T, TKey>

其中有 Find(Tkey)、FindAll() 等。

例如，它的使用方式如下：

IRepository<Catalog, int>

意味着 Catalog 有一个整数键。我像这样注册了它的存储库：

builder.RegisterType<CatalogRepository>()
    .As<IRepository<Catalog, int>>();

一切都很好。后来我意识到我需要一个额外的 .Find() 类型，所以我定义了一个新的接口：

ICatalogRepository : IRepository<Catalog, int>
{
    Catalog Find(string name);
}

并且我更改了注册：

builder.RegisterType<CatalogRepository>()
    .As<ICatalogRepository>();

但现在尝试解析 IRepository <目录，int>失败。我认为 Autofac 会识别与 ICatalogRepository 的关系并解决它。我必须这样做：

builder.RegisterType<CatalogRepository>()
    .As<ICatalogRepository>()
    .As<IRepository<Catalog, int>>();

让他们两个都得到解决。（仍然存在从其他不知道派生接口的通用实体操作工具来解析 IRepository 的调用。）我做错了什么吗？

原文

I am using AutoFAC 2.2.4 and have a question about covariance in container resolution.

I have a base interface definition for my repositories:

IRepository<T, TKey>

Which has Find(Tkey), FindAll(), etc.

It is used, for example, like this:

IRepository<Catalog, int>

meaning a Catalog has an integer key. I registered its repository like this:

builder.RegisterType<CatalogRepository>()
    .As<IRepository<Catalog, int>>();

All was well.
Later on I realized I needed an additional type of .Find() so I defiend a new interface:

ICatalogRepository : IRepository<Catalog, int>
{
    Catalog Find(string name);
}

And I changed the registeration:

builder.RegisterType<CatalogRepository>()
    .As<ICatalogRepository>();

But now attempts to resolve IRepository < Catalog, int > fail. I thought Autofac would recognize the relationship to ICatalogRepository and resolve it. I have had to do this:

builder.RegisterType<CatalogRepository>()
    .As<ICatalogRepository>()
    .As<IRepository<Catalog, int>>();

To get them both to resolve. (There are still calls to resolve IRepository from other generic entity manipulation tools that are unaware of the derived interface.) Am I doing something wrong?

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