How to access a named ListView inside a XAML DataTemplate in .NET MAUI (SfListView)?

The .NET MAUI ListView enables access to a named ListView defined inside the DataTemplate of a Popup by using a Behavior.

XAML:

In SfPopup.ContentTemplate, add behavior to the parent of the ListView.

    <StackLayout>
        <Button x:Name="clickToShowPopup"
            Text="ClickToShowPopup"
            VerticalOptions="Start"
            HorizontalOptions="Center"/>
        <popup:SfPopup x:Name="popup" WidthRequest="350" HeightRequest="350" ShowFooter="False" ShowHeader="False">
            <popup:SfPopup.BindingContext>
                <local:ContactsViewModel/>
            </popup:SfPopup.BindingContext>
            <popup:SfPopup.ContentTemplate>
                <DataTemplate>
                    <Grid>
                        <Grid.Behaviors>
                            <local:GridBehavior/>
                        </Grid.Behaviors>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="50"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>

                        <Button Text="Find ListView" Grid.Row="0" x:Name="listviewButton"/>
                        <sfListView:SfListView    x:Name="listView"  ItemSpacing="5" 
                                                    ItemsSource="{Binding Items}" 
                                                    SelectionMode="Single" Grid.Row="1">
                            <sfListView:SfListView.ItemTemplate>
                                <DataTemplate>
                                    <Grid x:Name="grid" RowSpacing="1">
                                       ...
                                    </Grid>
                                </DataTemplate>
                            </sfListView:SfListView.ItemTemplate>
                        </sfListView:SfListView>
                    </Grid>
                </DataTemplate>
            </popup:SfPopup.ContentTemplate>
        </popup:SfPopup>
    </StackLayout>

C#

In the ChildAdded event, you can get the instance of ListView.

public class GridBehavior : Behavior<Grid>
{
   Grid grid;
   SfListView listView;
   protected override void OnAttachedTo(BindableObject bindable)
   {
      grid = bindable as Grid;
       grid.ChildAdded += Grid_ChildAdded;
   }
   //Method 1 : Get SfListView reference using Grid.ChildAdded Event
   private void Grid_ChildAdded(object sender, ElementEventArgs e)
   {
       if (e.Element is SfListView)
       {
           listView = e.Element as SfListView;
           listView.RefreshView();
       }
   }
   protected override void OnDetachingFrom(BindableObject bindable)
   {
       grid.ChildAdded -= Grid_ChildAdded;
       listView = null;
       grid = null;
       base.OnDetachingFrom(bindable);
   }
}

C#

Alternatively, you can use the FindByName method to get the ListView from the Parent element.

public class GridBehavior : Behavior<Grid>
{
   Grid grid;
   SfListView listView;
   Button button;
   protected override void OnAttachedTo(BindableObject bindable)
   {
       grid = bindable as Grid;
       grid.ChildAdded += Grid_ChildAdded;
   }
   private void Grid_ChildAdded(object sender, ElementEventArgs e)
   {
       if (e.Element is Button)
       {
           button = e.Element as Button;
           button.Clicked += Button_Clicked;
       }
   }
   //Method 2 : Get SfListView reference using FindByName
   private void Button_Clicked(object sender, EventArgs e)
   {
       listView = grid.FindByName<SfListView>("listView");
       App.Current.MainPage.DisplayAlert("Information", "ListView instance obtained", "Ok");
       listView.ItemTapped += ListView_ItemTapped;
   }

   private void ListView_ItemTapped(object sender, Syncfusion.Maui.ListView.ItemTappedEventArgs e)
   {
       App.Current.MainPage.DisplayAlert("Information", "ListView ItemTapped", "Ok");
   }

   protected override void OnDetachingFrom(BindableObject bindable)
   {
       button.Clicked -= Button_Clicked;
       grid.ChildAdded -= Grid_ChildAdded;
       listView.ItemTapped -= ListView_ItemTapped;
       listView = null;
       button = null;
       grid = null;
       base.OnDetachingFrom(bindable);
   }
}

Download the complete sample from GitHub.

Conclusion:

I hope you enjoyed learning how to access a named ListView inside a XAML DataTemplate in .NET MAUI ListView.

You can refer to our .NET MAUI ListView feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started with configuration specifications.

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