我如何获得MEF容器进行自我注射 [英] How do i get MEF container to inject himself

问题描述

我正在将构造函数注入与MEF组成容器一起使用，我想知道如何使CompositionContainer自己将其注入到他提供的对象的实例上.

I'm using constructor injection with MEF Composition Container and I want to know how can I make the CompositionContainer inject itself on the instance of the object he is providing.

推荐答案

您可以使用

You can use one of the CompositionContainer.ComposeExportedValue methods to create a part from a given object.

这里是一个示例:

class Program
{
    static void Main(string[] args)
    {
        var container = new CompositionContainer(new ApplicationCatalog());
        Console.WriteLine("Main: container [{0}]", container.GetHashCode());

        container.ComposeExportedValue<CompositionContainer>(container);

        var exp = container.GetExportedValue<ExportThatNeedsContainer>();

        Console.ReadKey();
    }
}

[Export]
public class ExportThatNeedsContainer
{
    [ImportingConstructor]
    public ExportThatNeedsContainer(CompositionContainer cc)
    {
        Console.WriteLine("ExportThatNeedsContainer: cc [{0}]", cc.GetHashCode());
    }
}

这可行，但是据我所知，将容器注入零件并不是MEF的正常"用例.

This works, however injecting the container to a part, as far as I know, is not a "normal" use-case of MEF.

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