Select multiple rows checkbox datagrid Avalonia

[chuongmep]

Hi, I'm doing the way to can select multiple row in datagrid, my solution I think is not best, any recomend to improvement ?
This is my approach replace with

  <DataGridCheckBoxColumn Binding="{Binding IsSelected}" Header="Check" />

I'm using a event check in checkbox custom to allow select multiple row when click checkbox :

<DataGridTemplateColumn Header="Check">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <CheckBox
                VerticalContentAlignment="Center"
                VerticalAlignment="Center"
                Click="CheckList_click"
                IsChecked="{Binding IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

and then add custom click event :

private void CheckList_click(object sender, RoutedEventArgs e)
    {
        if (DataGrid.SelectedItem == null) return;
        bool? selected;
        CheckBox check = sender as CheckBox;
        selected = check.IsChecked;
        foreach (Models.ItemData vs in DataGrid.SelectedItems)
            vs.IsSelected = (bool)selected;
    }

It working perfect but it look like hard to follow with mvvm model pattern, anyone done before with another approach can help ?

[seishinkouki]

Using Avalonia.Xaml.Behaviors or Attached Properties, bind the SelectionChanged event to a command in the VM, where the command updates the multi-selected items by the args passed in, and then the user uses shift + left mouse click or ctrl + left mouse click to multi-select.

public void SelectionChanged(SelectionChangedEventArgs e)
{
    if (e.RemovedItems.Count > 0)
    {
        foreach (var item in e.RemovedItems)
        {
            if (item is YourOBJ yourOBJ )
            {
                SelectedOBJs.Remove(yourOBJ);
            }
        }
    }
    if (e.AddedItems.Count > 0)
    {
        foreach (var item in e.RemovedItems)
        {
            if (item is YourOBJ yourOBJ)
            {
                SelectedOBJs.Add(yourOBJ);
            }
        }
    }
}