C# 我的MEF出口有什么问题吗?
我得到一个错误:C# 我的MEF出口有什么问题吗?,c#,wpf,xaml,prism,mef,C#,Wpf,Xaml,Prism,Mef,我得到一个错误: An exception has occurred while trying to add a view to region 'MenubarRegion'. - The most likely causing exception was was: 'Microsoft.Practices.ServiceLocation.ActivationException: Activation error occured while trying t
An exception has occurred while trying to add a view to region 'MenubarRegion'.
- The most likely causing exception was was:
'Microsoft.Practices.ServiceLocation.ActivationException: Activation error occured
while trying to get instance of type MenuView, key "" --->
我的MenuView使用MEF通过MenuViewModel设置其datacontext,MEF通过inturn导入IServiceFactory的实例我确信由于IServiceFactory和MEF而发生错误。。。。。。。。我指的是出口或进口。我猜这是因为当我删除MenuViewModel中的ImportingConstructor和IServiceFactory声明时,我的程序运行良好
我已经使用MefX检查了MEF上的错误。结果如下:
这是我的代码:
MenuView.xaml.cs
[Export]
[PartCreationPolicy(CreationPolicy.NonShared)]
public partial class MenuView : UserControlViewBase
{
[ImportingConstructor]
public MenuView(MenuViewModel viewModel)
{
InitializeComponent();
this.DataContext = viewModel;
}
}
MenuViewModel.cs
[Export]
[PartCreationPolicy(CreationPolicy.NonShared)]
public class MenuViewModel : ViewModelBase
{
IServiceFactory _ServiceFactory;
[ImportingConstructor]
public MenuViewModel(IServiceFactory serviceFactory)
{
_ServiceFactory = serviceFactory;
}
protected override void OnViewLoaded()
{
_MenuItems = new ObservableCollection<MenuItem>();
WithClient<IMenuItemService>(_ServiceFactory.CreateClient<IMenuItemService>(), menuItemClient =>
{
MenuItem[] menuItems = menuItemClient.GetAllParentMenuItemsWithChildren();
if (menuItems != null)
{
foreach (MenuItem menuItem in menuItems)
{
_MenuItems.Add(menuItem);
}
_SelectedMenuItem = _MenuItems[2];
}
});
}
private ObservableCollection<MenuItem> _MenuItems;
public ObservableCollection<MenuItem> MenuItems
{
get
{
return _MenuItems;
}
set
{
if (_MenuItems != value)
{
_MenuItems = value;
OnPropertyChanged(() => MenuItems, false);
}
}
}
private MenuItem _SelectedMenuItem;
public MenuItem SelectedMenuItem
{
get
{
return _SelectedMenuItem;
}
set
{
if (_SelectedMenuItem != value)
{
_SelectedMenuItem = value;
OnPropertyChanged(() => SelectedMenuItem);
}
}
}
}
引导程序(WPF主应用程序)
公共类引导程序:MefBootstrapper
{
受保护的覆盖依赖对象CreateShell()
{
返回容器.GetExportedValue();
}
受保护的覆盖无效初始值设置Shell()
{
base.InitializeShell();
App.Current.MainWindow=(窗口)Shell;
App.Current.MainWindow.Show();
}
受保护的覆盖无效配置AggregateCatalog()
{
base.ConfigureAggregateCatalog();
AggregateCatalog.Catalogs.Add(新的AssemblyCatalog(typeof(BootStrapper.Assembly));
AggregateCatalog.Catalogs.Add(新的AssemblyCatalog(typeof(RegionNames.Assembly));
AggregateCatalog.Catalogs.Add(新的AssemblyCatalog(typeof(ModuleMenu.Module.Assembly));
}
}
App.xaml.cs
public partial class App : Application
{
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
ObjectBase.Container = MEFLoader.Init(new List<ComposablePartCatalog>()
{
new AssemblyCatalog(Assembly.GetExecutingAssembly())
});
BootStrapper bootstrapper = new BootStrapper();
bootstrapper.Run();
}
}
公共部分类应用程序:应用程序
{
启动时受保护的覆盖无效(StartupEventArgs e)
{
基础。启动时(e);
ObjectBase.Container=MEFLoader.Init(新列表()
{
新的AssemblyCatalog(Assembly.getExecutionGassembly())
});
BootStrapper BootStrapper=new BootStrapper();
bootstrapper.Run();
}
}
项目
这是我的项目,如果有人想看一下:
问题在于您的
ServiceFactory
实现没有添加到MEF目录中。添加时:
public class BootStrapper : MefBootstrapper
{
protected override DependencyObject CreateShell()
{
return Container.GetExportedValue<Shell>();
}
protected override void InitializeShell()
{
base.InitializeShell();
App.Current.MainWindow = (Window)Shell;
App.Current.MainWindow.Show();
}
protected override void ConfigureAggregateCatalog()
{
base.ConfigureAggregateCatalog();
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(BootStrapper).Assembly));
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(RegionNames).Assembly));
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(ModuleMenu.Module).Assembly));
//Added catalog
//-->
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(ServiceFactory).Assembly));
}
}
公共类引导程序:MefBootstrapper
{
受保护的覆盖依赖对象CreateShell()
{
返回容器.GetExportedValue();
}
受保护的覆盖无效初始值设置Shell()
{
base.InitializeShell();
App.Current.MainWindow=(窗口)Shell;
App.Current.MainWindow.Show();
}
受保护的覆盖无效配置AggregateCatalog()
{
base.ConfigureAggregateCatalog();
AggregateCatalog.Catalogs.Add(新的AssemblyCatalog(typeof(BootStrapper.Assembly));
AggregateCatalog.Catalogs.Add(新的AssemblyCatalog(typeof(RegionNames.Assembly));
AggregateCatalog.Catalogs.Add(新的AssemblyCatalog(typeof(ModuleMenu.Module.Assembly));
//新增目录
//-->
AggregateCatalog.Catalogs.Add(新的AssemblyCatalog(typeof(ServiceFactory.Assembly));
}
}
对于引导程序配置,应用程序在启动时停止引发异常。(但它仍然没有显示任何内容)
为了添加该类型,我需要在主应用程序中添加对其他项目的引用。您是否研究了该异常的所有内部异常?@Evk没有内部异常。可能需要在界面
IServiceFactory
中编写一些属性?例如,[Export][PartCreationPolicy(CreationPolicy.NonShared)]
?@据我所知,接口不能用此类属性装饰谢谢先生!!!!!!你太棒了。我在客户端的MEFLoader类的MEF目录中添加了ServiceFactory实现。所以,我认为没有必要将其添加到引导程序类中。你让我开心。多谢各位。
public static class MEFLoader
{
public static CompositionContainer Init()
{
return Init(null);
}
public static CompositionContainer Init(ICollection<ComposablePartCatalog> catalogParts)
{
AggregateCatalog catalog = new AggregateCatalog();
catalog.Catalogs.Add(new AssemblyCatalog(typeof(MenuItemClient).Assembly));
catalog.Catalogs.Add(new AssemblyCatalog(typeof(MEFLoader).Assembly));
if (catalogParts != null)
foreach (var part in catalogParts)
catalog.Catalogs.Add(part);
CompositionContainer container = new CompositionContainer(catalog);
return container;
}
}
public static class MEFLoader
{
public static CompositionContainer Init()
{
AggregateCatalog catalog = new AggregateCatalog();
catalog.Catalogs.Add(new AssemblyCatalog(typeof(MunimPlusEngine).Assembly));
catalog.Catalogs.Add(new AssemblyCatalog(typeof(MenuItemManager).Assembly));
catalog.Catalogs.Add(new AssemblyCatalog(typeof(MenuItemRepository).Assembly));
catalog.Catalogs.Add(new AssemblyCatalog(typeof(MEFLoader).Assembly));
CompositionContainer container = new CompositionContainer(catalog);
return container;
}
}
public class BootStrapper : MefBootstrapper
{
protected override DependencyObject CreateShell()
{
return Container.GetExportedValue<Shell>();
}
protected override void InitializeShell()
{
base.InitializeShell();
App.Current.MainWindow = (Window)Shell;
App.Current.MainWindow.Show();
}
protected override void ConfigureAggregateCatalog()
{
base.ConfigureAggregateCatalog();
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(BootStrapper).Assembly));
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(RegionNames).Assembly));
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(ModuleMenu.Module).Assembly));
}
}
public partial class App : Application
{
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
ObjectBase.Container = MEFLoader.Init(new List<ComposablePartCatalog>()
{
new AssemblyCatalog(Assembly.GetExecutingAssembly())
});
BootStrapper bootstrapper = new BootStrapper();
bootstrapper.Run();
}
}
public class BootStrapper : MefBootstrapper
{
protected override DependencyObject CreateShell()
{
return Container.GetExportedValue<Shell>();
}
protected override void InitializeShell()
{
base.InitializeShell();
App.Current.MainWindow = (Window)Shell;
App.Current.MainWindow.Show();
}
protected override void ConfigureAggregateCatalog()
{
base.ConfigureAggregateCatalog();
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(BootStrapper).Assembly));
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(RegionNames).Assembly));
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(ModuleMenu.Module).Assembly));
//Added catalog
//-->
AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(ServiceFactory).Assembly));
}
}