Question

我试图创建一个可以动态加载实现接口“IPlugin”的类的应用程序，我有：

        var catalog = new AssemblyCatalog(typeof(Shell).Assembly);
        var externalCatalog = new DirectoryCatalog(@".\Modules");

        var container = new CompositionContainer(catalog);


        var a = new AggregateCatalog(externalCatalog, catalog);

但是当我试图获得出口时：

        CompositionContainer __container = new CompositionContainer(a);
        //get all the exports and load them into the appropriate list tagged with the importmany
        __container.Compose(batch);

        var yyyy = __container.GetExports<IModule>();

它在外部程序集“Rejseplan”中找不到我的“IPlugin”。

<小时/> “Rejseplan”插件的实现:(未加载的插件）

 namespace Rejseplan
 {

[ModuleExport(typeof(IPlugin), InitializationMode = InitializationMode.WhenAvailable)]
class RejseplanModule : IModule, IPlugin
{
     private readonly IRegionViewRegistry regionViewRegistry;

    [ImportingConstructor]
     public RejseplanModule(IRegionViewRegistry registry)
    {
        this.regionViewRegistry = registry;   
    }

    public void Initialize()
    {
        regionViewRegistry.RegisterViewWithRegion("MainRegion", typeof(Views.DepartureBoard));       
    }

    string IPlugin.Name
    {
        get { throw new NotImplementedException(); }
    }

    string IPlugin.Version
    {
        get { throw new NotImplementedException(); }
    }

    string IPlugin.TabHeader
    {
        get { throw new NotImplementedException(); }
    }
}
}

“测试”插件（GETS加载的插件）的实施：

  namespace HomeSystem
    {
     [Export(typeof(IPlugin))]
    [ModuleExport(typeof(IModule), InitializationMode =   InitializationMode.WhenAvailable)]
    public class Test : IModule, IPlugin
    {
    public void Initialize()
    {

    }

    public string Name
    {
        get { return "Test"; }
    }

    public string Version
    {
        get { return "Tis"; }
    }

    public string TabHeader
    {
        get { return "Tabt"; }
    }
}

}

希望你们能帮助你们！：）

Answer 1

尝试这样做。

var directoryPath = "path to dll folder";
var asmCatalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
var directoryCatalog = new DirectoryCatalog(directoryPath, "*.dll");

var aggregateCatalog = new AggregateCatalog();
aggregateCatalog.Catalogs.Add(asmCatalog);
aggregateCatalog.Catalogs.Add(directoryCatalog);

var container = new CompositionContainer(aggregateCatalog);

container.ComposeParts(this);

Answer 2

说实话，我真的不知道你想要实现的目标:) 但是如果你想在你的电话中看到你的RejseplanModule：

__container.GetExports<IModule>();

您必须添加正确的导出属性。

RejseplanModule不是MEF标记的导出类型IModule。如果它是一个错字，你能检查你的代码吗？至少它应该是以下（见typeof（ IModule ））

编辑：

外部dll

[Export(typeof(IModule))]//<-- remove this if its handled by your custom ModulExport Attribute
[ModuleExport(typeof(IModule), InitializationMode = InitializationMode.WhenAvailable)]
class RejseplanModule : IModule, IPlugin
{...}

您的主应用程序（来自上面的fhnaseer的代码）

var directoryPath = "path to dll folder";
var asmCatalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
var directoryCatalog = new DirectoryCatalog(directoryPath, "*.dll");

var aggregateCatalog = new AggregateCatalog();
aggregateCatalog.Catalogs.Add(asmCatalog);
aggregateCatalog.Catalogs.Add(directoryCatalog);

var container = new CompositionContainer(aggregateCatalog);

var allIModulPlugins = container.GetExports<IModule>();

MEF仅加载从本地程序集导出

2 个答案: