使用 MEF 在控制器中导入值集合的最佳方法
我有一个支持可视化插件/提供程序的 ASP.NET MVC2 应用程序。 IVisualization 接口在公共程序集中定义，ASP.NET MVC2 应用程序和任何可视化提供程序都引用该程序集。
在可视化控制器中，我有一个方法可以返回给定数据集的所有适用可视化效果。为了扫描可用的提供程序，我在控制器的 ActionMethod 中使用以下代码。
var catalog = new DirectoryCatalog(HttpRuntime.BinDirectory);
var container = new CompositionContainer(catalog);
var visualizations = container.GetExportedValues<IVisualization>();
但是，我觉得如果控制器中有以下内容
[ImportMany]
public IEnumerable<IVisualization> Visualizations { get; set; }
，那么导入应该会自动发生。我错过了什么阻止自动导入？
另外，我当前使用的代码是否会破坏网站的扩展？
谢谢， 埃里克
I have an ASP.NET MVC2 application that supports visualization plug-ins/providers. The IVisualization interface is defined in a common assembly which is referenced by both the ASP.NET MVC2 app, and any visualization providers.
In the Visualization controller, I have a method which returns all the applicable visualizations for a given set of data. In order to scan the available providers, I use the following code in the controller's ActionMethod.
var catalog = new DirectoryCatalog(HttpRuntime.BinDirectory);
var container = new CompositionContainer(catalog);
var visualizations = container.GetExportedValues<IVisualization>();
However, I feel like if I have the following in the controller
[ImportMany]
public IEnumerable<IVisualization> Visualizations { get; set; }
then the import should happen automatically. What am I missing that prevents the automatic imports?
Also, is the code that I am currently using going to kill scaling of website?
Thanks,
Erick
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为了让 MEF 满足导入，它还需要负责控制器的实例化。您可以在 MVC 中使用自定义控制器工厂来完成此操作。您可以在我的博客中找到此示例（可能已过时）： 链接
In order for MEF to satisfy the imports, it needs to also be responsible for the instantiation of the controller. You can do that in MVC by using a custom controller factory. You can find a sample (maybe outdated) of this in my blog: Link
如果您有一个声明特定属性导入的控制器，则必须以编程方式调用 MEF 的方法之一来满足它们。
一些选项包括：
除其他外。
我希望这能说明我的观点。
If you have a controller that declares that particular property import, you must programatically call one of MEF's methods to satisfy them.
Some options are:
among others.
I hope this illustrates my point.