与泛型类型的注入变化实现服务定位器 [英] Implementing a Service Locator with injected variations of Generic Type

问题描述

我有以下内容：

public interface IConverter<TValue, TConverted>
{     
}

public interface IConverterProvider
{
    IConverter<TValue, TConverted> GetConverter<TValue, TConverted>();
}

通过一个例子在设置绑定：

With an example binding at setup:

Bind<IConverter<System.Int32, System.String>>().To<Int32ToStringConverter>();
Bind<IConverter<System.Guid, System.String>>().To<GuidToStringConverter>();

所以，我有固定的转换器和没有重复绑定的集合。

So I have a collection of fixed converters and no duplicate bindings.

[问题]
我的问题是我怎么去实施IConverterProvider和注射映射到单身可用绑定的字典？或者换句话说，如何避免运行时服务定位器模式。

[Question] My question is how do I go about implementing the IConverterProvider and injecting a dictionary of available bindings mapped to singletons? Or in other words, how to avoid the run-time service-locator pattern.

目前我只用NInject内核每次来解决，但我相信这个反模式。我想是这样的：

Currently I'm just using the NInject kernel to resolve each time, but I believe this an anti-pattern. What I would like is something like this:

public class ConverterProvider : IConverterProvider
{
    private Dictionary<Type, object> _converters;

    public ConverterProvider(Dictionary<Type, object> converters)
    {
        _converters = converters;
    }

    public IConverter<TValue, TConverted> GetConverter<TValue, TConverted>()
    {
        var fullTypeResolve = typeof (IConverter<,>).MakeGenericType(typeof (TValue), typeof (TConverted));

        return _converters.Where(x => x.Key == fullTypeResolve).Select(x=>x.Value).Cast<IConverter<TValue, TConverted>>().Single();
    }
}

但是，这有效地要求我能解决并得到所有IConverter列表<，>从依赖注入内核，以及我以前从NInject这样的尝试都没有成功。

But this effectively requires that I'm able to resolve and get a list of all IConverter<,> from the dependency injection kernel, and my previous attempts of doing this from NInject haven't been successful.

推荐答案

这是通过的 Ninject.Extensions.Factory

This is supported by Ninject.Extensions.Factory

Bind<IConverter<System.Int32, System.String>>().To<Int32ToStringConverter>();
Bind<IConverter<System.Guid, System.String>>().To<GuidToStringConverter>();
Bind<IConverterProvider>().ToFactory();

没有要求实施

重命名 GetConverter 到 CreateConverter 或其他名称不能与获取

Rename GetConverter to CreateConverter or another name not starting with Get

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