如何使用MEF的GetExport\ImportDefinition？
我有主项目和一系列 dll，它们具有某些接口的特定实现以及视图\视图模型等。我使用 {ImportMany] 来获取所有这些元数据，这允许我选择一个，这给出了我参考了ISystem的具体实现。
我想从选择 ISystem 的任何 dll 中获取 IDisplay 的唯一具体实现，我用 [Export("SomeDisplay", typeof(IDisplay))] 标记了它 到目前为止，我能找到的唯一看起来可能有效的方法是 GetExports(ImportDefinition)，但我不明白如何创建一个有效的 ImportDefinition，因为它似乎需要一个特定的合约名称，而这不是直到运行时才知道。
当然，因为我仍然是 MEF n00b，所以我很可能做错了 :D 那么，如果 GetExports 是最好的方法，我该如何让它发挥作用呢？或者我应该使用更好的方法？
谢谢！
I've got main project, and a series of dll's that have specific implementations of some interfaces as well as view\viewmodels, etc. I use {ImportMany] to get them all with some metadata, which allows me to choose one, which gives me a reference to the specific implementation of ISystem.
I'd like to get the only specific implementation of IDisplay from whatever dll the ISystem is chosen from, which I marked with [Export("SomeDisplay", typeof(IDisplay))]
So far, the only thing that I can find that looks like it might work is GetExports(ImportDefinition), but I don't understand how to create an ImportDefinition that would work, as it seems to want a specific contractname, which isn't known until runtime.
Of course since I'm still a MEF n00b, it's a good bet I'm doing it wrong :D
So, if GetExports is the best way, how can I make it work? Or is there a better way I should be using?
Thanks!
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您需要考虑在 MEF 导出的同时提供元数据。
有关详细信息，请参阅以下文章和博客文章：
You need to look into providing metadata along with your MEF exports.
See these articles and blog posts for details: