How to Change the Checkbox Column Values Based on Selection in WPF TreeGrid?

This sample illustrates how to change the checkbox column values based on selection in WPF TreeGrid (SfTreeGrid).

In TreeGrid, you can select multiple rows using the SelectionMode property. You can process the CheckBoxSelection using TreeGridCheckBoxColumn and a boolean property called IsSelected in Model. You can also select all the rows in TreeGrid by defining the CheckBox in header cell of GridCheckBoxColumn using GridColumn.HeaderTemplate.

public static class Commands
{
    static Commands()
    {
        CommandManager.RegisterClassCommandBinding(typeof(CheckBox), new CommandBinding(CheckAndUnCheck, OnCheckUnCheckCommand, OnCanExecuteCheckAndUnCheck));
    }

    public static RoutedCommand CheckAndUnCheck = new RoutedCommand("CheckAndUnCheck", typeof(CheckBox));

    private static void OnCheckUnCheckCommand(object sender, ExecutedRoutedEventArgs args)
    {
        var treegrid = (args.Parameter as SfTreeGrid);
        var viewmodel = (treegrid.DataContext as ViewModel);
        var checkbox = (sender as CheckBox).IsChecked;
        if (viewmodel != null)
        {
            if (checkbox == true)
            {
                treegrid.SelectAll();
                foreach (var collection in viewmodel.EmployeeInfo)
                {
                    if (collection.IsSelected == false)
                        collection.IsSelected = true;
                }
            }
            else if (checkbox == false)
            {
                treegrid.ClearSelections(false);
                foreach (var collection in viewmodel.EmployeeInfo)
                {  
                    if (collection.IsSelected == true)
                        collection.IsSelected = false;
                }
            }
        }
    }

    private static void OnCanExecuteCheckAndUnCheck(object sender, CanExecuteRoutedEventArgs args)
    {
        args.CanExecute = true;
    }     
}