[英]ImportCardinalityMismatchException when using RegisterBootstrapperProvidedTypes with PRISM MEF
when I override RegisterBootstrapperProvidedTypes and I try to register my own WCServiceAgent the Bootstrapper throws a当我覆盖 RegisterBootstrapperProvidedTypes 并尝试注册我自己的 WCServiceAgent 时,Bootstrapper 会抛出一个
ImportCardinalityMismatchException
Additional information: No exports were found that match the constraint:
ContractName Microsoft.Practices.ServiceLocation.IServiceLocator
RequiredTypeIdentity Microsoft.Practices.ServiceLocation.IServiceLocator
The exception occurs with:异常发生在:
protected override void RegisterBootstrapperProvidedTypes()
{
this.Container.ComposeExportedValue<IModuleCatalog>(this.ModuleCatalog);
this.Container.ComposeExportedValue<AggregateCatalog>(this.AggregateCatalog);
}
and also with还有
protected override void RegisterBootstrapperProvidedTypes()
{
this.Container.ComposeExportedValue<MyWCFServiceAgent>(new MyWCFServiceAgent(1));
}
in my Bootstrapper class在我的 Bootstrapper 课程中
public class Bootstrapper : MefBootstrapper
{
//protected override void RegisterBootstrapperProvidedTypes()
//{
//see above code
//}
protected override System.Windows.DependencyObject CreateShell()
{
return this.Container.GetExportedValue<ShellWindow>();
}
protected override void ConfigureAggregateCatalog()
{
this.AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(Bootstrapper).Assembly));
base.ConfigureAggregateCatalog();
}
protected override Microsoft.Practices.Prism.Regions.IRegionBehaviorFactory ConfigureDefaultRegionBehaviors()
{
var factory = base.ConfigureDefaultRegionBehaviors();
//factory.AddIfMissing("AutoPopulateExportedViewsBehavior", typeof(AutoPopulateExportedViewsBehavior));
return factory;
}
protected override IModuleCatalog CreateModuleCatalog()
{
return base.CreateModuleCatalog();
}
protected override void InitializeShell()
{
base.InitializeShell();
App.Current.MainWindow = (Window)this.Shell;
App.Current.MainWindow.Show();
}
}
How can I fix this?我怎样才能解决这个问题? Whats the cause of the exception?
异常的原因是什么?
You need to call the base implementation first.您需要先调用基本实现。
protected override void RegisterBootstrapperProvidedTypes()
{
base.RegisterBootstrapperProvidedTypes();
// your custom registrations go here...
}
If you take a look at the implementation of the bootstrapper base class, you'll see that there are 4 exports which need to be composed:如果您查看引导程序基类的实现,您会发现有 4 个导出需要组合:
this.Container.ComposeExportedValue<ILoggerFacade>(this.Logger);
this.Container.ComposeExportedValue<IModuleCatalog>(this.ModuleCatalog);
this.Container.ComposeExportedValue<IServiceLocator>(new MefServiceLocatorAdapter(this.Container));
this.Container.ComposeExportedValue<AggregateCatalog>(this.AggregateCatalog);
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