wpf listbox checkbox combination, really stuck - wpf

Question

I am trying to link the checkbox and listview together, and then use the binding method to set the path to the object in order to set the check-box IsChecked status in the listbox.
List<Test1> datas = new List<Test1>();
var data = new Test1 {Key = 1, Value = "Hello", IsSelected= true};
datas.Add(data);
data = new Test1 {Key = 2, Value = "Hello2", IsSelected= false};
datas.Add(data);
What I need to happen is that if the checkbox is checked ( IsSelected is true ) then I need to populate with those values and then when I click and unclick the checkbox in the GUI I need it to also select the proper listeview item so I can get to the tag property.
This code below does not set the checkbox IsChecked.
<ListBox ItemsSource="{Binding}" Name="lstSwimLane" Width="225" Height="125" SelectionChanged="lstSwimLane_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding RelativeSource={RelativeSource AncestorType=ListBoxItem}, Path=IsSelected, Mode=TwoWay}"
Checked="CheckBox_Checked"
Unchecked="CheckBox_Unchecked" />
<TextBlock Text="{Binding Path=Value}"></TextBlock>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
What do I need to change in order to set the check box to the value in the object? I even tried INotifyChange etc...
Here is the object as well.
public class Test1 : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private bool _isChecked;
public int Key { get; set; }
public string Value { get; set; }
public bool IsSelected
{
get { return _isChecked; }
set
{
if(_isChecked != value)
{
_isChecked = value;
OnPropertyChanged("IsSelected");
}
}
}
protected void OnPropertyChanged(string name)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
I am new to all this wpf, and I am stumped.
Thanks.

Answer 1

Do you need this to work "three-way"? So setting any of the three properties
ListBoxItem.IsSelected
CheckBox.IsChecked
Item1.IsSelected
will affect both of the other properties? Unfortunately, there is no such Binding in WPF so you're gonna have to do a little extra work.
Update
As pointed out by Robert Rossney, a much better solution for this is to bind
ListBoxItem.IsSelected to Item1.IsSelected
CheckBox.IsChecked to ListBoxItem.IsSelected
Updated Xaml
<ListBox ItemsSource="{Binding}"
Name="lstSwimLane"
SelectionMode="Multiple"
Width="225" Height="125" SelectionChanged="lstSwimLane_SelectionChanged">
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="IsSelected"
Value="{Binding Path=IsSelected,
Mode=TwoWay}"/>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox Checked="CheckBox_Checked"
Unchecked="CheckBox_Unchecked"
IsChecked="{Binding RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}},
Path=IsSelected}">
</CheckBox>
<TextBlock Text="{Binding Path=Value}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

Answer 2

In case anyone is interested, here is the markup for the listbox / combox. It will display horizontal.
Thank you all again for all you help as I greatly appreciated it.
<ListBox ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ItemsSource="{Binding}"
Name="lstSwimLane"
SelectionMode="Multiple"
Width="auto"
Height="auto"
Background="Transparent"
BorderThickness="0"
SelectionChanged="lstSwimLane_SelectionChanged" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="IsSelected" Value="{Binding Path=IsChecked, Mode=TwoWay}"/>
</Style>
</ListBox.ItemContainerStyle>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="3,3,3,3">
<CheckBox IsChecked="{Binding RelativeSource={RelativeSource AncestorType={x:Type ListBoxItem}}, Path=IsSelected}"
Checked="CheckBox_Checked"
Unchecked="CheckBox_Unchecked"
VerticalAlignment="Center"
Margin="0,0,4,0" />
<TextBlock Text="{Binding Value}" VerticalAlignment="Center"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>