UWP - 如何通过右键单击或右键点击获取 ListViewItem 值而不选择无 Listviewitem？

Question

你好，我有一个数据列表（sqlite）加载到列表视图中，如果我选择一个列表视图项并右键单击它，一切正常，但我想在不选择任何列表视图项的情况下获取当前的列表视图项（在指针下）

我想要的是类似于“微软to DO”的应用

我有以下示例代码：

MainPage.xaml

<Grid>
    <ListView x:Name="myList">
        <ListViewItem>Item 1</ListViewItem>
        <ListViewItem>Item 2</ListViewItem>
        <ListViewItem>Item 3</ListViewItem>
        <ListViewItem>Item 4</ListViewItem>
        <ListViewItem>Item 5</ListViewItem>

        <ListView.ContextFlyout>
            <MenuFlyout x:Name="itemActual">
                <MenuFlyoutItem Text="see" Click="MenuFlyoutItem_Click"/>
            </MenuFlyout>
        </ListView.ContextFlyout>
    </ListView>

</Grid>

MainPage.xaml.cs：

 private void MenuFlyoutItem_Click(object sender, RoutedEventArgs e)
    {
        ContentDialog dialog = new ContentDialog()
        {
            //Content = myList.item ????

            PrimaryButtonText = "ok"
        };
        dialog.ShowAsync();

    }

提前致谢

Answer 1

我原来的答案不正确，所以我决定编辑它。

首先，创建一个名为 _selectedValue 的字段，其类型为您的 ListView 的 ItemsSource 项目类型，我将其命名为“MyClass”：

private MyClass _selectedItem;

然后，注册 ListView 的 RightTapped 事件：

<ListView x:Name="myList" RightTapped="myList_RightTapped">

从那里，从RightTappedRoutedEventArgs 获取DataContext：

private void myList_RightTapped(object sender, Windows.UI.Xaml.Input.RightTappedRoutedEventArgs e) {
    _selectedItem = (e.OriginalSource as FrameworkElement).DataContext as MyClass;
}

当您的浮出控件的Click 事件被触发时，使用_selectedValue：

private void MenuFlyoutItem_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e) {
    // Do stuff with _selectedValue
}

完整示例文件：

MainPage.cs：

 public sealed partial class MainPage : Page {
    #region Fields
    private List<MyClass> _items;
    private MyClass _selectedItem;
    #endregion

    public MainPage() {
        this.InitializeComponent();

        _items = new List<MyClass>();
        _items.Add(new MyClass() { Name = "O" });
        _items.Add(new MyClass() { Name = "P" });
        myList.ItemsSource = _items;
    }

    private void MenuFlyoutItem_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e) {
        // Do stuff with _selectedValue
    }

    private void myList_RightTapped(object sender, Windows.UI.Xaml.Input.RightTappedRoutedEventArgs e) {
        _selectedItem = (e.OriginalSource as FrameworkElement).DataContext as MyClass;
    }

    public class MyClass {

        public string Name { get; set; }

        public override string ToString() => Name;

    }
}

MainPage.xaml：

<Page
    x:Class="UWP.Sandbox.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UWP.Sandbox"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
        <ListView x:Name="myList" RightTapped="myList_RightTapped">
            <ListView.ContextFlyout>
                <MenuFlyout x:Name="itemActual">
                    <MenuFlyoutItem Text="see" Click="MenuFlyoutItem_Click"/>
                </MenuFlyout>
            </ListView.ContextFlyout>
        </ListView>
    </Grid>
</Page>