WPF - 棱镜7.1 - 导航 - 控制选项卡控件 - 模态/对话窗口

Question

我正在使用Prism 7.1导航框架(WPF)来获取一个对话框窗口,使用下面的配置弹出.这很成功.但是,我希望这个弹出窗口有标签,我可以来回导航.当我单击弹出框上的按钮试图在其中显示ViewA时,没有任何反应.通过设置断点,我看到导航路径被命中,并显示正确的视图名称.请参阅PopUpWindow.cs.但是,当它解析视图时,视图不会显示.更糟糕的是,没有错误!我很困惑为什么会这样.

假设我的命名空间是正确的,我做错了什么？

PrismApplication.cs

protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
    containerRegistry.RegisterForNavigation<ViewA>();
}

//Have tried register type, register type for navigation, etc etc.

MainWindowViewModel.xaml

<Window 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True"
        Height="350" Width="525">
    <i:Interaction.Triggers>
        <prism:InteractionRequestTrigger SourceObject="{Binding NotificationRequest}">
            <prism:PopupWindowAction IsModal="True" CenterOverAssociatedObject="True" />
        </prism:InteractionRequestTrigger>
    </i:Interaction.Triggers>
    <StackPanel>
        <Button Margin="5" Content="Raise Default Notification" Command="{Binding NotificationCommand}" />
    </StackPanel>

MainWindowViewModel.cs

public MainWindowViewModel
{
    public InteractionRequest<INotification> NotificationRequest { get; set; }
    public DelegateCommand NotificationCommand { get; set; }

    public MainWindowViewModel()
    {
        NotificationRequest = new InteractionRequest<INotification>();
        NotificationCommand = new DelegateCommand(RaiseNotification);
    }

    void RaiseNotification()
    {
        NotificationRequest.Raise(new PopupWindow());
    }
}

PopUpWindow.xaml

<UserControl 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:prism="http://prismlibrary.com/"
        prism:ViewModelLocator.AutoWireViewModel="True"
        Height="350" Width="525">
    <DockPanel LastChildFill="True">
        <StackPanel Orientation="Horizontal" DockPanel.Dock="Top" Margin="5" >
            <Button Command="{Binding NavigateCommand}" CommandParameter="ViewA" Margin="5">Navigate to View A</Button> 
        </StackPanel>
        <ContentControl prism:RegionManager.RegionName="ContentRegion" Margin="5"  />
    </DockPanel>
</UserControl>

PopUpWindow.cs

public class PopupWindowViewModel
{
    private readonly IRegionManager _regionManager;

    public DelegateCommand<string> NavigateCommand { get; private set; }

    public PopupWindowViewModel(IRegionManager regionManager)
    {
        _regionManager = regionManager;

        NavigateCommand = new DelegateCommand<string>(Navigate);
    }

    private void Navigate(string navigatePath)
    {
        if (navigatePath != null)
            _regionManager.RequestNavigate("ContentRegion", navigatePath); 

        //During debugging, this correctly shows navigatePath as "ViewA"
    }
}

ViewA.xaml

<UserControl 
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:prism="http://prismlibrary.com/"             
             prism:ViewModelLocator.AutoWireViewModel="True">
    <Grid>
        <TextBlock Text="ViewA" FontSize="48" HorizontalAlignment="Center" VerticalAlignment="Center" />
    </Grid>
</UserControl>

Answer 1

不在可视化树中的区域将被区域管理器忽略。ContentRegion您在（延迟创建的）中定义PopUpWindow，因此它不在那里，并且未知区域的导航请求将被忽略。

正如此处和那里所详细描述的，在这种情况下，您必须在包含该区域的视图的构造函数中手动添加该区域：

RegionManager.SetRegionName( theNameOfTheContentControlInsideThePopup, WellKnownRegionNames.DataFeedRegion );
RegionManager.SetRegionManager( theNameOfTheContentControlInsideThePopup, theRegionManagerInstanceFromUnity );

与来自以下地区的区域经理ServiceLocator：

ServiceLocator.Current.GetInstance<IRegionManager>()