Ninject多播 [英] Ninject Multicasting

问题描述

我要绑定一个服务的多种实现，并已全部叫一次：

I want to bind multiple implementations of a service and have all of them called at once:

var kernel = new StandardKernel();

kernel.Bind<IBreakfast>.To<Spam>();
kernel.Bind<IBreakfast>.To<Eggs>();
kernel.Bind<IBreakfast>.To<MoreSpam>();

kernel.Get<IBreakfast>().Eat();   // call Eat method on all three bound implementations

Ninject不喜欢这一点，将抛出关于有多个绑定例外。 ？有没有一种办法可以解决这个错误，并且都被称为实现

Ninject doesn't like that, and will throw an exception about having multiple bindings. Is there a way I can get around that error, and have all the implementations called?

此外，绑定<> 通话可以在可能会或可能不会在运行时加载不同的项目，所以创建一个单一的执行调用它们将无法正常工作。这是一个ASP.NET MVC 3网站插件架构的一部分。

Also, the Bind<> calls can be in different projects which may or may not be loaded at run-time, so creating a single implementation to call them won't work. This is part of a plug-in architecture for an ASP.NET MVC 3 web site.

推荐答案

如果您使用构造器注入有一个列表与LT; IBreakfast> 参数，则Ninject组将利用所有绑定的列表。然后，您可以拨打吃这些实例。

If you use constructor injection and have a List<IBreakfast> parameter, then Ninject will construct a list using all your bindings. You can then call Eat on these instances.

您可以使用此模式来获得Ninject创建列表你的插件实例。

You can use this pattern to get Ninject to create a list of your plugins for instance.

    [Test]
    public void Test()
    {
        IKernel kernel = new StandardKernel();

        kernel.Bind<IBreakfast>().To<Eggs>();
        kernel.Bind<IBreakfast>().To<Spam>();
        kernel.Bind<IBreakfast>().To<MoreSpam>();

        var bling = kernel.Get<Bling>();
    }

    private class Bling
    {
        public Bling(List<IBreakfast> things)
        {
            things.ForEach(t => t.Eat());
        }
    }

    private interface IBreakfast
    {
        void Eat();
    }

    private class Ingrediant : IBreakfast
    {
        public void Eat(){Console.WriteLine(GetType().Name);}
    }

    private class Eggs : Ingrediant{}
    private class Spam : Ingrediant{}
    private class MoreSpam : Ingrediant { }

输出：

鸡蛋结果
垃圾邮件< BR>
MoreSpam

Eggs
Spam
MoreSpam

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