静态类的C#MEF用法 [英] C# MEF usage with static classes

问题描述

我的解决方案中有一个静态类，该类用于处理各种程序集.我想通过MEF链接它们，所以我在一个类中做了一个字段.

I have a static class in my solution which is used to work with various assemblies. I want to link them through MEF, so I made a field in a class.

[Import(typeof(A))]
    static private A _a1;

然后我有一个方法，将程序集名称作为参数传递给该方法:

Then I have a method to which I pass assembly name as an argument:

    public static A LoadPackage(string filePath)
    {
            var catalog = new AggregateCatalog();
            catalog.Catalogs.Add(new AssemblyCatalog(filePath));
            var _container = new CompositionContainer(catalog);
            ???
    }

那么现在有没有办法从文件路径指定的程序集中导入类型?

So is there a way now to import type from assembly specified by filepath?

我做不到:

_container.ComposeParts(this);

由于类是静态的，我也不能这样做

since class is `static and neither can I do this

_container.ComposeParts(_a1);

(一开始可能是完全错误的)，因为A没有任何构造函数(因此_a1为null)

(which might be completely wrong to begin with) since A doesn't have any constructors(so _a1 is null)

推荐答案

事实证明，我正在寻找的方法是GetExportedValue(是的，我忽略了基本功能):

Well it turns out that method I was looking for is GetExportedValue (yeah, I overlooked basic functionality):

static private A _a1;

public static A LoadPackage(string filePath)
{
        var catalog = new AggregateCatalog();
        catalog.Catalogs.Add(new AssemblyCatalog(filePath));
        var _container = new CompositionContainer(catalog);
        _a1 = _container.GetExportedValue<A>();
}

然后我就把自己的领域填满了(以防万一，我已经将它移到另一个类了，现在看起来很整洁)

And I got my field filled (just in case, I already moved it to another class, and it looks neat and clean now)

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