如何在 Prism4 MEF 中创建我的类的实例？
我已配置容器：
public class MyBootstrapper : MefBootstrapper
{
protected override void ConfigureAggregateCatalog()
{
AggregateCatalog.Catalogs.Add(xxx.Assembly));
// other assemblies
}
protected override void InitializeShell()
{
base.InitializeShell();
Application.Current.MainWindow = (MainWindow)Shell;
Application.Current.MainWindow.Show();
}
protected override DependencyObject CreateShell()
{
return Container.GetExportedValue<MainWindow>();
}
}
如何在模块中创建类型 T 的实例？类型 T 在程序集中的某处定义，由 MEF 配置。
我需要这样的：
var myType = XXXX.Resolve<T>();
UPD1。 我的模块
[ModuleExport(typeof(CatalogModule))]
public class CatalogModule : IModule
{
private readonly IEventAggregator _event;
private readonly IUIManager _uiManager;
[ImportingConstructor]
public CatalogModule(IEventAggregator @event, IUIManager uiManager)
{
_event = @event;
_uiManager = uiManager;
}
private void Foo()
{
var vm = **How create instance of desired type here?**
}
}
I have configured container:
public class MyBootstrapper : MefBootstrapper
{
protected override void ConfigureAggregateCatalog()
{
AggregateCatalog.Catalogs.Add(xxx.Assembly));
// other assemblies
}
protected override void InitializeShell()
{
base.InitializeShell();
Application.Current.MainWindow = (MainWindow)Shell;
Application.Current.MainWindow.Show();
}
protected override DependencyObject CreateShell()
{
return Container.GetExportedValue<MainWindow>();
}
}
How can I create instance of my type T in module? Type T is defined somewhere in assemblies, that are configured by MEF.
I need some like this:
var myType = XXXX.Resolve<T>();
UPD1.
MyModule
[ModuleExport(typeof(CatalogModule))]
public class CatalogModule : IModule
{
private readonly IEventAggregator _event;
private readonly IUIManager _uiManager;
[ImportingConstructor]
public CatalogModule(IEventAggregator @event, IUIManager uiManager)
{
_event = @event;
_uiManager = uiManager;
}
private void Foo()
{
var vm = **How create instance of desired type here?**
}
}
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评论（1）
执行此操作的方式与在
CreateShell方法重写中获取MainWindow实例的方式相同。您所要做的就是调用Container.GetExportedValue() ，它允许您直接获取实例。但是，如果您想要注入类型，为了实现更松散的耦合，您需要一个带有[ImportingConstructor]属性的构造函数，该属性取决于该类型（或者最好是接口），或者具有[Import]属性的该类型的属性。确保通过使用
[Export]属性修饰类来导出类型，并将程序集添加到AggregateCatalog中。希望这有帮助；）
You do that the same way you got an instance of
MainWindowin theCreateShellmethod override. All you have to do is callContainer.GetExportedValue<T>(), which allows you to get an instance directly. If, however, you want to have a type injected, for more loose coupling, you need to have a constructor with and[ImportingConstructor]attribute that depends on that type (or preferably, an Interface), or a property of that type with an[Import]attribute.Make sure that you have your type exported, by decorating the class with a
[Export]attribute, and that the assembly is added to theAggregateCatalog.Hope this helps ;)