[英]MEF and WPF without Prism
Can someone please show me an example of building the MEF Composition Container in the app.xaml.cs file without using prism or a console app which is no problems. 有人可以告诉我一个在app.xaml.cs文件中构建MEF合成容器的示例,而无需使用棱镜或控制台应用程序,这没有问题。
The Exports work but the imports don't and all the examples I see are only working with Prism which I don't want to use. 导出有效,但导入无效,我看到的所有示例仅适用于我不想使用的Prism。 The import will work if in the App.xaml.cs file but I don't understand why the Import won't work in the MainWindow.cs and everything is in the root assembly.
如果在App.xaml.cs文件中,导入将起作用,但是我不明白为什么在MainWindow.cs中导入将不起作用,并且一切都在根程序集中。
I can get it to compose if I do the composition in the MainWindow constructor but I would like to compose in app.xaml.cs if possible. 如果我在MainWindow构造函数中进行合成,则可以编写它,但是如果可能的话,我想在app.xaml.cs中编写。
Here is a sample (I'm actually using mvvm but this example behaves the same with code behind). 这是一个示例(我实际上正在使用mvvm,但此示例的行为与后面的代码相同)。
public partial class App : Application
{
public App()
{
ShutdownMode = ShutdownMode = ShutdownMode.OnMainWindowClose;
}
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
Compose();
var window = new MainWindow();
window.Show();
}
public void Compose()
{
var catalog = new AggregateCatalog(new AssemblyCatalog(Assembly.GetExecutingAssembly()), new DirectoryCatalog("."));
var container = new CompositionContainer(catalog);
container.ComposeParts(this);
}
}
[Export]
public class MessagePlugin
{
public string GetMessage()
{
return "Successfully composed message";
}
}
public partial class MainWindow : Window
{
[Import]
public MessagePlugin plugin { get; set; }
public MainWindow()
{
InitializeComponent();
Loaded += MainWindow_Loaded;
}
private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
var p = plugin; <-------------------------------NULL
MessageBox.Show(p.GetMessage());
}
}
public partial class App : Application
{
private CompositionContainer container;
[Import(typeof(Window))]
public Window TheMainWindow { get; set; }
public App()
{
ShutdownMode = ShutdownMode = ShutdownMode.OnMainWindowClose;
}
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
TheMainWindow = new MainWindow();
Compose();
Application.Current.MainWindow = TheMainWindow;
Application.Current.MainWindow.Show();
}
public void Compose()
{
var catalog = new AggregateCatalog();
catalog.Catalogs.Add(new AssemblyCatalog(typeof(App).Assembly));
container = new CompositionContainer(catalog);
container.ComposeParts(this);
}
}
[Export(typeof(Window))] public partial class MainWindow : Window { [Import] public MessagePlugin plugin { get; [Export(typeof(Window))]公共部分类MainWindow:Window {[Import]公共MessagePlugin插件{get; set;
组; }
}
public MainWindow()
{
InitializeComponent();
Loaded += MainWindow_Loaded;
}
private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
var p = plugin;
if (p != null)
{
MessageBox.Show(p.GetMessage());
}
else
{
MessageBox.Show("Plugin NOT Composed");
}
}
}
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