How do you use the ContextFlyout with a ListView?

Question

I am trying to add a MenuFlyout to my UWP app for supporting a controller. The problem is that I can't figure out how to determine which ListViewItem actually triggered the event.

CodeBehind

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();

        this.DataContext = new List<String>{ "Item 1", "Item 2", "Item 3"};
    }

    private void ChoiceA_Click(object sender, RoutedEventArgs e)
    {
        // What was clicked?
    }
}

XAML

<ListView ItemsSource="{Binding}">
        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Setter Property="ContextFlyout">
                    <Setter.Value>
                        <MenuFlyout>
                            <MenuFlyoutItem Text="Choice A" Click="ChoiceA_Click" />
                            <MenuFlyoutItem Text="Choice B" />
                        </MenuFlyout>
                    </Setter.Value>
                </Setter>
            </Style>
        </ListView.ItemContainerStyle>
    </ListView>

Answer 1

I just tested your code with Local machine and Mobile emulator, your MenuFlyout can be shown only on PC by right tapped on the ListView, then here is a solution, you can find the OriginalSource in the RightTapped event of ListView, then get the DataContext of this OriginalSource for example like this:

private FrameworkElement originalSource;
private void ChoiceA_Click(object sender, RoutedEventArgs e)
{
    var itemdatacontext = originalSource.DataContext;
}

private void ListView_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
    originalSource = (FrameworkElement)e.OriginalSource;
}

Answer 2

Bind to the Opening event of the MenuFlyout. In the event handler the sender is the MenuFlyout itself. There you will find the Target property which points to the ListViewItem.

Based on your example your XAML could look like this:

<ListView ItemsSource="{Binding}">
        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Setter Property="ContextFlyout">
                    <Setter.Value>
                        <MenuFlyout Opening="ListView_Opening">
                            <MenuFlyoutItem Text="Choice A" Click="ChoiceA_Click" />
                            <MenuFlyoutItem Text="Choice B" />
                        </MenuFlyout>
                    </Setter.Value>
                </Setter>
            </Style>
        </ListView.ItemContainerStyle>
    </ListView>

Your code behind goes like this:

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();

        this.DataContext = new List<String>{ "Item 1", "Item 2", "Item 3"};
    }

    private string ListViewItemString;

    private void ChoiceA_Click(object sender, RoutedEventArgs e)
    {
        // What was clicked?
        var clickedItem = ListViewItemString;
    }

    private void ListView_Opening(object sender, object e)
    {
        ListViewItemString = ((sender as MenuFlyout)?.Target as ListViewItem)?.Content as string;
    }
}