Disabling checkbox checking in WPF - wpf

Question

I want to make impossible checking checkbox in WPF (from C# code). Only unchecking would be allowed.
How can I do it?
PS.Writing event handler on Click event which would immediately uncheck checkbox after checking it is not acceptable.
[edit]Checkbox should always be enabled, so that user can think that checkbox can be checked. It's strange but it's specific programme.

Answer 1

<CheckBox Content="Checkbox"
IsEnabled="{Binding RelativeSource={RelativeSource Self}, Path=IsChecked}" />
Edit after being informed that the checkbox always has to look to be in an checkable state, even when it's not. Here is a working example:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero" x:Class="WpfTest.MainWindow"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ControlTemplate x:Key="DeceptiveCheckbox" TargetType="{x:Type CheckBox}">
<BulletDecorator Background="Transparent" SnapsToDevicePixels="True">
<BulletDecorator.Bullet>
<Microsoft_Windows_Themes:BulletChrome BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" IsChecked="{TemplateBinding IsChecked}" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderPressed="{TemplateBinding IsPressed}"/>
</BulletDecorator.Bullet>
<ContentPresenter ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</BulletDecorator>
<ControlTemplate.Triggers>
<Trigger Property="HasContent" Value="True">
<Setter Property="FocusVisualStyle">
<Setter.Value>
<Style>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle Margin="14,0,0,0" SnapsToDevicePixels="True" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="Padding" Value="4,0,0,0"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Window.Resources>
<Grid>
<CheckBox Content="CheckBox" IsEnabled="{Binding IsChecked, RelativeSource={RelativeSource Self}}" Template="{StaticResource DeceptiveCheckbox}" />
</Grid>
</Window>
The fix was simple. I simply created a copy of the current checkbox template and removed:
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>

Answer 2

How about this:
<Grid>
<Grid.Resources>
<Style TargetType="CheckBox">
<Style.Triggers>
<Trigger Property="IsChecked" Value="False">
<Setter Property="IsEnabled" Value="False" />
</Trigger>
</Style.Triggers>
</Style>
</Grid.Resources>
<CheckBox IsChecked="True" />
</Grid>
This approach has the benefit of being applied to all (as-is) or many (if you apply a x:Key attribute and then assign the resource to the desired checkboxes) without needing to do anything special or change the bindings of the individual checkboxes.

Answer 3

An easy solution could be to bind the IsEnabled property to be equal to the IsChecked property.