Get SelectedItems in datagrid

Question

I've a problem with my selected items recuperation in my datagrid.

In my xaml file, I've this :

            <i:Interaction.Triggers>
                <i:EventTrigger EventName="SelectionChanged">
                    <i:InvokeCommandAction Command="{Binding SelectionChanged}" CommandParameter="{Binding SelectedItems, ElementName=technicalAlarmDatagrid}"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>

Then, in my ViewModel, I've the binding Command like this :

        public ICommand SelectionChanged
        {
            get
            {
                if (_selectionChangedCommand == null)
                    _selectionChangedCommand = CreateCommand<object>(OnSelectionChanged);
                return _selectionChangedCommand;
            }
        }

        private void OnSelectionChanged(object parameter)
        {
            ...
        }

Now, my problem is : In my datagrid, if I just have one item, the selectionChanged event doesn't work. But if I have more than one item, so, my event works.

Do you have any idea in order to solve my problem ? Thank a lot !

Answer 1

In your XAML Code add attribute SelectedIndex="-1"

<DataGrid SelectedIndex="-1" SelectionChanged="DataGridSelectionChanged" ...>
  ...
</DataGrid>