Question

I have following code:

<ControlTemplate x:Key="ViewItemTemplate"
                             TargetType="ListViewItem">
                    <StackPanel Orientation="Horizontal">
                        <CheckBox Margin="0,0,3,0" x:Name="CkBox">
                            <CkBox.IsChecked>
                                <Binding Path="IsSelected"
                                     Mode="TwoWay">
                                    <Binding.RelativeSource>
                                        <RelativeSource Mode="TemplatedParent" />
                                    </Binding.RelativeSource>
                                </Binding>
                            </CkBox.IsChecked>
                            <DataTrigger Binding="{Binding InvalidForeground}" Value="true">
                                <Setter TargetName="CkBoxVisual" Property="Foreground" Value="#999999"/>
                            </DataTrigger>
                        </CheckBox>
                        <ContentPresenter />
                    </StackPanel>
            </ControlTemplate>

How can i bind InvalidForeground? I looked online for many example they tell to use DataTemplate. But when i add DataTemplate above StackPanel i get errors? Am i doing something wrong?

I am trying to bind InvalidForeground so i can add some code to it. I am getting an error: Cannot resolve symbol ‘InvalidForeground’ due to unknown DataContext.

Answer 1

<ControlTemplate x:Key="ViewItemTemplate"
                         TargetType="ListViewItem">
        <StackPanel Orientation="Horizontal">
            <CheckBox Margin="0,0,3,0" x:Name="CkBox">
                <CkBox.IsChecked>
                    <Binding Path="IsSelected"
                                 Mode="TwoWay">
                        <Binding.RelativeSource>
                            <RelativeSource Mode="TemplatedParent" />
                        </Binding.RelativeSource>
                    </Binding>
                </CkBox.IsChecked>
                 <DataTrigger Binding="{Binding InvalidForeground, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}" Value="true">
                    <Setter TargetName="CkBoxVisual" Property="Foreground" Value="#999999"/>
                </DataTrigger>
            </CheckBox>
            <ContentPresenter />
        </StackPanel>
    </ControlTemplate>

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;
        abc A = new abc();
        A.InvalidForeground = true;
    }
}
public class abc : INotifyPropertyChanged
{
    private bool invalidForeGround;
     public bool InvalidForeground
    {
        get
        { return invalidForeGround; }
        set
        { 
            invalidForeGround = value;
            Notify("InvalidForeground");
        }
     }
     private void Notify(string propName)
     {
         if (PropertyChanged != null)
             PropertyChanged(this, new PropertyChangedEventArgs(propName));
     }

    public event PropertyChangedEventHandler PropertyChanged;
}

InvalidForeground must be the property in the DataContext of the Control whose template the above code is.I hope this will help