棱镜对话框：无法解析分辨率根对象

Question

我在 Prism 8.0.0.1909 和 dotnet core 3.1 和 5 上试过这个。 对于我的对话，我有一个看法：

<UserControl
x:Class="xzy.Modules.CapillaryBatchwise.Dialogs.NewBatchDialog"
xmlns:prism="http://prismlibrary.com/"
prism:ViewModelLocator.AutoWireViewModel="True">
...
</UserControl>

还有一个目前什么都没有的视图模型：

namespace zxy.Modules.CapillaryBatchwise.ViewModels
{
public class NewBatchDialogViewModel : BindableBase, IDialogAware
    {
        ...
        public string Title => "MyTitle";
        public event Action<IDialogResult> RequestClose;
        public bool CanCloseDialog() => true;

        public void OnDialogClosed()
        { }

        public void OnDialogOpened(IDialogParameters parameters)
        { }
    }
}

我在 App.xaml.cs 中注册了视图和视图模型

namespace xyz.CapillaryJournal
{
    public partial class App
    {
        ...
        protected override void RegisterTypes(IContainerRegistry containerRegistry)
        {
            containerRegistry.RegisterDialog<NewBatchDialog, NewBatchDialogViewModel>();
        }
}}

然后从我的实际 ViewModel 中调用它

 public class CapillaryBatchNavigationViewModel : BindableBase
    {
        private readonly IDialogService dialogService;

        public CapillaryBatchNavigationViewModel(//...
                                                 IDialogService dialogService)
        {
            ///...
            ShowNewBatchDialogCommand = new DelegateCommand(ShowNewBatchDialog);
            this.dialogService = dialogService;
            //...
        }
        public DelegateCommand ShowNewBatchDialogCommand { get; }
        private void ShowNewBatchDialog()
        {
            dialogService.ShowDialog(nameof(ShowNewBatchDialog));
        }
        //...
    }

但是，当我从视图中调用 ShowNewBatchDialogCommand 时，我得到了这个异常，我无法理解：

Prism.Ioc.ContainerResolutionException: 'An unexpected error occurred while resolving 'System.Object', with the service name 'ShowNewBatchDialog''

Inner Exception
ContainerException: code: Error.UnableToResolveFromRegisteredServices;
message: Unable to resolve Resolution root Object {ServiceKey="ShowNewBatchDialog"}
  from container without scope
 with Rules with {TrackingDisposableTransients, UseDynamicRegistrationsAsFallbackOnly, FuncAndLazyWithoutRegistration, SelectLastRegisteredFactory} and without {ThrowOnRegisteringDisposableTransient, UseFastExpressionCompilerIfPlatformSupported}
 with FactorySelector=SelectLastRegisteredFactory
 with Made={FactoryMethod=ConstructorWithResolvableArguments}
  with normal and dynamic registrations:
  ("NewBatchDialog", {FactoryID=160, ImplType=xyy.Modules.CapillaryBatchweise.Dialogs.NewBatchDialog, Reuse=TransientReuse})  ("TaskPresenter", {FactoryID=177, ImplType=xyy.Modules.CapillaryBatchweise.Views.TaskPresenter, Reuse=TransientReuse})

这基本上是对本文档中所做的稍作修改：https://prismlibrary.com/docs/wpf/dialog-service.html

我无法发现我的代码有什么问题。

Answer 1

您应该调用dialogService.ShowDialog(nameof(NewBatchDialog));，因为视图的名称NewBatchDialog 而ShowNewBatchDialog 是一些不相关方法的名称。

或者您可以使用特定名称注册视图，例如 containerRegistry.RegisterDialog<NewBatchDialog, NewBatchDialogViewModel>( "ShowNewBatchDialog" );...