小编Gav*_*ard的帖子

我正在尝试将 ListView 的 ItemSelected 绑定到视图模型，但遇到了一些问题（由于我自己对其工作原理的误解）。

我有观点：

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:Local="clr-namespace:FireLearn.ViewModels"
             x:Class="FireLearn.MainPage"
             Title="Categories">

    <ContentPage.BindingContext>
        <Local:CategoryViewModel/>
    </ContentPage.BindingContext>
    <NavigationPage.TitleView>
        <Label Text="Home"/>
    </NavigationPage.TitleView>
    <ListView
        ItemsSource="{Binding Categories}"
        HasUnevenRows="True"
        IsPullToRefreshEnabled="True"
        IsRefreshing="{Binding ListRefreshing, Mode=OneWay}"
        RefreshCommand="{Binding RefreshCommand}"
        ItemSelected="{Binding OnItemTappedChanged}"
        SelectionMode="Single"
        SelectedItem="{Binding SelectedCategory}">

        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <HorizontalStackLayout
                        Padding="8"
                        VerticalOptions="Fill"
                        HorizontalOptions="Fill">

                        <Image Source="cafs_bubbles.png"    
                               HeightRequest="64"
                               MaximumWidthRequest="64"
                               HorizontalOptions="CenterAndExpand"
                               VerticalOptions="CenterAndExpand"/>

                        <VerticalStackLayout
                            Padding="8"
                            VerticalOptions="FillAndExpand"
                            HorizontalOptions="FillAndExpand">
                            <Label Text="{Binding FormattedName}" 
                                       SemanticProperties.HeadingLevel="Level1"
                                       FontSize="Title"
                                       HorizontalOptions="Start"/>
                            <Label Text="{Binding ItemCount}" 
                                   FontSize="Subtitle"/>
                            <Label Text="{Binding Description}" 
                                   HorizontalOptions="Center"
                                   LineBreakMode="WordWrap"
                                   FontSize="Caption"
                                   VerticalOptions="CenterAndExpand"
                                   MaxLines="0"/>
                        </VerticalStackLayout>
                    </HorizontalStackLayout>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</ContentPage> …