How to notify item selection using MVVM in .NET MAUI ListView (SfListView)?

The .NET MAUI ListView allows you to determine whether an item is selected by maintaining a boolean property in the model class. The property value is updated using selection events such as SelectionChanging, SelectionChanged.

XAML:

<ContentPage xmlns:listView="clr-namespace:Syncfusion.Maui.ListView;assembly=Syncfusion.Maui.ListView">
    <ContentPage.BindingContext>
        <local:ContactsViewModel x:Name="ViewModel"/>
    </ContentPage.BindingContext>
    <ContentPage.Resources>
        <ResourceDictionary>
            <local:CustomConverter x:Key="EventArgs" />
        </ResourceDictionary>
    </ContentPage.Resources>
    <ContentPage.Content>
        <Grid>
            <listView:SfListView x:Name="listView" 
                           ItemsSource="{Binding Items}" >
                <listView:SfListView.Behaviors>
                    <local:EventToCommandBehavior EventName="SelectionChanged" 
                                        Command="{Binding SelectionChangedCommand}"
                                        Converter="{StaticResource EventArgs}" />
                </listView:SfListView.Behaviors>

                <listView:SfListView.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Label Text="{Binding ContactName}" FontSize="Medium" />                          
                        </Grid>
                    </DataTemplate>
                </listView:SfListView.ItemTemplate>
            </listView:SfListView>
        </Grid>
    </ContentPage.Content>
</ContentPage>

C#:

namespace ListViewMaui
{
    public class ContactsViewModel : INotifyPropertyChanged
    {
        public Command<object> SelectionChangedCommand
        {
            get { return selectionChangedCommand; }
            protected set { selectionChangedCommand = value; }
        }


        public ContactsViewModel()
        {
            selectionChangedCommand = new Command<object>(OnSelectionChanged);
            Items = new ObservableCollection<Contacts>();
        }


        public void OnSelectionChanged(object obj)
        {
            var eventArgs = obj as ItemSelectionChangedEventArgs;

            for (int i = 0; i < eventArgs.RemovedItems.Count; i++)
            {
                var item = eventArgs.RemovedItems[i] as Contacts;
                if (item.IsSelected)
                {
                    item.IsSelected = false;
                    App.Current.MainPage.DisplayAlert("Message", "Item removed from selected item", "ok");
                }
            }
            for (int i = 0; i < eventArgs.AddedItems.Count; i++)
            {
                var item = eventArgs.AddedItems[i] as Contacts;
                if (!item.IsSelected)
                {
                    item.IsSelected = true;
                    App.Current.MainPage.DisplayAlert("Message", "Item added into selected item", "ok");
                }
            }
        }
    }
}

Output:

Download the complete sample from GitHub.

Conclusion

I hope you enjoyed learning how to notify item selection using MVVM in the .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. Explore our .NET MAUI ListView example to understand how to create and manipulate data.

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