C# UWP MVVM 在另一个视图中注入一个视图

C# UWP MVVM inject a view inside another view

您好,我有一个 xaml 文件,其中有一个带有 NavigatioViewItems 的 NavigationView。在 NavigationView 中,我有一个 ScrollViewer,我想在其中注入一个视图。这是 xaml:

<Page
    x:Class="ToolBoxApp.Views.AudioHomeView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:ToolBoxApp.Views"
    xmlns:viewmodels="using:ToolBoxApp.ViewModels"
    xmlns:mainview="clr-namespace:ToolBoxApp"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:i="using:Microsoft.Xaml.Interactivity"
    xmlns:core="using:Microsoft.Xaml.Interactions.Core"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <!--<Page.DataContext>
        <viewmodels:AudioHomeViewModel/>
    </Page.DataContext>-->
    
    <Grid>
        <NavigationView x:Name="navigationViewControl" 
                        IsBackEnabled="true"
                        >

            <i:Interaction.Behaviors>
                <core:EventTriggerBehavior EventName="ItemInvoked">
                    <core:EventTriggerBehavior.Actions>
                        <core:InvokeCommandAction Command="{Binding NavigateToTextToSpeechView}" />
                    </core:EventTriggerBehavior.Actions>
                </core:EventTriggerBehavior>
            </i:Interaction.Behaviors>

            <NavigationView.MenuItems>
                <NavigationViewItem Icon="MusicInfo" Content="Text to Speech"/>
                <NavigationViewItem Icon="MusicInfo" Content="Youtube to Mp3"/>
            </NavigationView.MenuItems>

            <ScrollViewer>
                <Frame x:Name="ContentFrame"/>
            </ScrollViewer>
    
        </NavigationView>
    </Grid>
</Page>

到目前为止,我有一个 NavigationService,我可以在其中导航到不同的视图:

    public class NavigationService : INavigationService
    {
        public void GoBack()
        {
            var frame = (Frame)Window.Current.Content;
            frame.GoBack();
        }

        public void Navigate(Type sourcePage)
        {
            var frame = (Frame)Window.Current.Content;
            frame.Navigate(sourcePage);    
        }

        public void Navigate(Type sourcePage, object parameter)
        {
            var frame = (Frame)Window.Current.Content;
            frame.Navigate(sourcePage, parameter);
        }

        public void NavigateScrollViewer(Type sourcePage, Type injectPage)
        {
            var frame = (Frame)Window.Current.Content;
            
            var page = frame.CurrentSourcePageType;
        }
    }

NavigatScrollViewer 方法应该以通用方式实现它,因为整个应用程序都将使用它。我将有不同的 Windows,如上面的 xaml 文件,我想在其中将视图注入 ScrollViewer Frame。有没有办法在代码中获取对此 ScrollViewer 的引用,然后将其 Frame 设置为我想通过 NavigationService 指定的视图? 任何帮助表示赞赏。谢谢

C# UWP MVVM inject a view inside another view

如果使用过MVVM设计,需要绑定FrameSourcePageType属性与ViewModel的页面类型属性。您只需要更新此页面类型属性,框架内容就会更新。

Here 是您可以参考的示例代码。

Is there a way to get a reference to this ScrollViewer inside code and then setting its Frame to the view I want to specify through the NavigationService?

另一种方法是将 ContentFrame 实例传递给 NavigationService。首先,您需要为 NavigationService class 添加新框架 属性。然后用 MyFrame.

替换你的代码框
public class NavigationService
{
    private Frame MyFrame { get; set; }
    public NavigationService(Frame frame)
    {
        MyFrame = frame;
    }
}

乌斯佳

 var navService = new NavigationService(ContentFrame);

以上设计参考了Windows Template StudioNavigationService,是完整的实现,NavigationService初始化过程在shell页面[=23] =]

ViewModel.Initialize(shellFrame, navigationView, KeyboardAccelerators);