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How to retrieve the dragged item index in ViewModel command with the Prism framework in Xamarin.Forms ListView (SfListView)?

You can retrieve the drag index of ListViewItem in ViewModel using the Prism framework DelegateCommand in Xamarin.Forms SfListView.


EventToCommandBehavior to convert the ItemDragging event to a command and set ListView behavior.

<syncfusion:SfListView x:Name="listView" Grid.Row="1" ItemSize="60" BackgroundColor="#FFE8E8EC" GroupHeaderSize="50" ItemsSource="{Binding ToDoList}" DragStartMode="OnHold,OnDragIndicator" SelectionMode="None">
        <local:EventToCommandBehavior EventName="ItemDragging" Command="{Binding ItemDraggingCommand}"/>
            <Frame HasShadow="True" BackgroundColor="White" Padding="0">
                    <OnPlatform x:TypeArguments="x:Boolean" Android="True" iOS="False"/>
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="60" />
                    <Label x:Name="textLabel" Text="{Binding Name}" FontSize="15" TextColor="#333333" VerticalOptions="Center" HorizontalOptions="Start" Margin="5,0,0,0" />
                    <syncfusion:DragIndicatorView Grid.Column="1" ListView="{x:Reference listView}" HorizontalOptions="Center" VerticalOptions="Center">
                        <Grid Padding="10, 20, 20, 20">
                            <Image Source="DragIndicator.png" VerticalOptions="Center" HorizontalOptions="Center" />


Create command for the ItemDragging event with the ItemDraggingEventArgs parameter. You can access the item index from NewIndex field of the ItemDraggingEventArgs.

public class ViewModel
    public DelegateCommand<ItemDraggingEventArgs> ItemDraggingCommand { get; set; }
    public ViewModel()
        ItemDraggingCommand = new DelegateCommand<ItemDraggingEventArgs>(OnItemDragging);
    private void OnItemDragging(ItemDraggingEventArgs args)
        if (args.Action == DragAction.Drop)
            App.Current.MainPage.DisplayAlert("Message", "ListView item index after reordering " + args.NewIndex, "Ok");


Gif image to show how to retrieve item index of the dragged item in ListView.

View sample in GitHub

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Steven Marcus
Jul 13, 2020

I've copied the code and I get following error as soon as dragging happens.

System.NullReferenceException: 'Object reference not set to an instance of an object.'

Steven Marcus
Jul 13, 2020


if (args is null) return;

in the onitemdragging function shows that args is never anything but a null value. Thoughts?

Steven Marcus
Jul 13, 2020


You need to copy over the folder Helper containing BehaviorBase.cs / EventToCommandBehavior.cs into your project. Ensure that your page is set to xmlns:local to your namespace not PRISMLIBRARY.com

Lakshmi Natarajan [Syncfusion]
Jul 14, 2020

Hi Steven,

Greetings from Syncfusion.

You can refer to our online document to use Prism framework EventToCommandBehavior with default event args from the following link, KB link: https://www.syncfusion.com/kb/11680/how-to-work-with-prism-using-the-eventtocommandbehavior-in-xamarin-forms-listview

Regards, Lakshmi Natarajan


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