c# – 使用autofac解析方法内部的类实例

使用下面的这个PipelineX类,有没有办法解决应用于pipline的过滤器而不注入autofac容器并调用_container.Resolve();

public class PipelineX<T> : FilterBase<T>, IPipelineX<T>
{
    private readonly IContainer _container;

    public PipelineX(IContainer container)
    {
        _container = container;
    }
    protected override T Process(T input)
    {
        return input;
    }

    public PipelineX<T> FilterBy<X>()
    {
        var filter = _container.Resolve(typeof(X)) as IFilter<T>;
        Register(filter);
        return this;
    }                             
}

为了避免将Autofac用作服务定位器,您可以在其中注册自己的工厂方法,在这种情况下：

builder.Register<Func<Type, object>>((c, p) =>
{
    var context = c.Resolve<IComponentContext>();
    return type => context.Resolve(type);
});

并在您的PipelineX类中使用它,如下所示：

private readonly Func<Type, object> filterFactory;

public PipelineX(Func<Type, object> filterFactory)
{
    this.filterFactory = filterFactory;
}

protected override T Process(T input)
{
    return input;
}

public PipelineX<T> FilterBy<X>()
{
    var filter = this.filterFactory(typeof(X)) as IFilter<T>;
    Register(filter);
    return this;
}

考虑：这只删除了对Autofac容器的硬引用,它仍然使用一个抽象对象工厂,该工厂不够自我解释,应该由自定义过滤器工厂或选择器实现替换.