Ninject从IBinding中获取目标类型

Question

我有一个由几种类型实现的接口.但在我做之前,我kernel.GetAll<IAmServiceable>()希望能够思考注射的目标类型.

我知道函数kernel.GetBindings(typeof(IAmServiceable))存在,但这会返回一个列表IBinding.

有谁知道如何从中获取目标类型IBinding？

我想知道在IAmServiceable实例化之前绑定的类型.

Answer 1

我知道你的问题现在可能有点晚了,但是因为我今天遇到了这个问题,我认为其他人也可能.

这是我最终提出的代码 - 我认为它不完美(远离它),特别是关于性能,但它适用于我的情况,因为我不打算经常调用这种方法,似乎没关系我.

public Type GetBoundToType(IKernel kernel, Type boundType)
{
    var binding = kernel.GetBindings(boundType).FirstOrDefault();
    if (binding != null)
    {
        if (binding.Target != BindingTarget.Type && binding.Target != BindingTarget.Self)
        {
            // TODO: maybe the code  below could work for other BindingTarget values, too, feelfree to try
            throw new InvalidOperationException(string.Format("Cannot find the type to which {0} is bound to, because it is bound using a method, provider or constant ", boundType));
        }

        var req = kernel.CreateRequest(boundType, metadata => true, new IParameter[0], true, false);
        var cache = kernel.Components.Get<ICache>();
        var planner = kernel.Components.Get<IPlanner>();
        var pipeline = kernel.Components.Get<IPipeline>();
        var provider = binding.GetProvider(new Context(kernel, req, binding, cache, planner, pipeline));
        return provider.Type;
    }

    if (boundType.IsClass && !boundType.IsAbstract)
    {
        return boundType;
    }
    throw new InvalidOperationException(string.Format("Cannot find the type to which {0} is bound to", boundType));
}

Answer 2

这不可能。例如，本例中的类型是什么？

Bind<IX>().ToMethod(c => RandomBool() ? new Foo() : new Bar());