How to select checkbox in ListView from code - WPF - wpf

Question

I have a ListView with checkboxes like this:
<ListView
x:Name="usersListView"
Width="300"
ItemsSource="{Binding}"
IsSynchronizedWithCurrentItem="True"
SelectionChanged="childrenListView_SelectionChanged"
Background="{StaticResource BackgroundPrimaryBrush}"
Foreground="{StaticResource WhiteBrush}"
Grid.Row="6" Grid.ColumnSpan="2"
>
<ListView.View>
<GridView>
<GridView.Columns>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<CheckBox Tag="{Binding Id}" IsChecked="{Binding RelativeSource={RelativeSource AncestorType={x:Type ListViewItem}}, Path=IsSelected}" />
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn DisplayMemberBinding="{Binding FullName}" Header="Name" Width="250"/>
</GridView.Columns>
</GridView>
</ListView.View>
</ListView>
All checkboxes in ListView are from List 'AllUsers' from database.
Now I want to set specific checkboxes to IsChecked=True in code behind.
I have another List 'Children' which have only few of the 'AllUsers' elements.
What I want is to display ListView with selected checkboxed binded to Persons in 'Children'.
I tried to implement this by myself with INotifyPropertyChanged implemented class wrapper to Person but I couldn't get Binding properly with this.
I hope I did explain the problem properly.
Thank you in advance :)

Answer 1

Consider using a IMultiValueConverter.
In the example below, my Children object is a simple string with the name. I have two list, the AllChildrens list and the SelectedChildrens list.
Foreach element in the AllChildrens collection, the converter checks if the element is contained into SelectedChildrens collection.
XAML: (I've removed the events)
<ListView ItemsSource="{Binding AllChildrens}" Tag="{Binding SelectedChildrens}">
<ListView.Resources>
<local:IEnumerableContainsConverter x:Key="Contains" />
</ListView.Resources>
<ListView.View>
<GridView>
<GridView.Columns>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<CheckBox Content="{Binding}">
<CheckBox.IsChecked>
<MultiBinding Converter="{StaticResource Contains}">
<Binding Path="." />
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ListView}}" Path="Tag" />
</MultiBinding>
</CheckBox.IsChecked>
</CheckBox>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn DisplayMemberBinding="{Binding FullName}" Header="Name" Width="250"/>
</GridView.Columns>
</GridView>
</ListView.View>
</ListView>
ViewModel:
public class Model
{
public Model()
{
AllChildrens = new List<string>()
{
"James",
"Annabelle",
"Kevin",
"William",
"Joseph",
};
SelectedChildrens = new List<string>()
{
"James",
"Annabelle",
"William",
};
}
public List<string> AllChildrens { get; set; }
public List<string> SelectedChildrens { get; set; }
}
Converter:
class IEnumerableContainsConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values != null &&
values.Length == 2 &&
values[0] is string current_children && // Replace with your children object type
values[1] is IEnumerable<string> selected) // Replace with your children object type
{
return selected.Contains(current_children);
}
return false;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}