Disable Style in WPF XAML?

Question

Is there anyway to turn off a style programatically?

As an example, I have a style that is linked to all textboxes

<Style TargetType="{x:Type TextBox}">

I would like to add some code to actually stop the style elements being used, so basically reverting back to the default control style.

I need a way to make a switch in my styles, so I can switch between Windows default style and my custom style through C# code.

Is there anyway to do this?

Thanks

Working Solution

Switching between themes in WPF

Solution 1

For setting the style to default,

In XAMl use,

<TextBox Style="{x:Null}" />

In C# use,

myTextBox.Style = null;

---

If style needs to be set as null for multiple resources, see CodeNaked's response.

---

I feel, all the additional info should be in your question and not in the comments. Anyways, In code Behind I think this is what you are trying to achieve:

Style myStyle = (Style)Application.Current.Resources["myStyleName"];

public void SetDefaultStyle()
{
    if(Application.Current.Resources.Contains(typeof(TextBox)))
        Application.Current.Resources.Remove(typeof(TextBox));

    Application.Current.Resources.Add(typeof(TextBox),      
                                      new Style() { TargetType = typeof(TextBox) });
}

public void SetCustomStyle()
{
    if (Application.Current.Resources.Contains(typeof(TextBox)))
        Application.Current.Resources.Remove(typeof(TextBox));

    Application.Current.Resources.Add(typeof(TextBox), 
                                      myStyle);
}

Solution 2

You could inject a blank Style that would take precedence over your other Style. Like so:

<Window>
    <Window.Resources>
        <Style TargetType="TextBox">
            <Setter Property="Background" Value="Red" />
        </Style>
    </Window.Resources>
    <Grid>
        <Grid.Resources>
            <Style TargetType="TextBox" />
        </Grid.Resources>
    </Grid>
</Window>

In the example above, only the Grid's implicit Style would be applied to TextBoxes in the Grid. You could even add this to the Grid programmatically, something like:

this.grid.Resources.Add(typeof(TextBox), new Style() { TargetType = typeof(TextBox) });

Solution 3

I know the answer has been accepted, but i want to add my solution which works awesome in the following scenario:

• One main application using mahapps.metro
• additional project imported from the main application with no reference to mahapps.metro, it is imported as a plugin (loading compiled .dll on the fly)
• using the < ToolBar> re-styles everything to null therefore the mahapps.metro styles are not being applied to items inside the toolbar.
• usercontrol is used to provide custom controls to the main application.

in the user control root set the resources:

<UserControl.Resources>
    <Style x:Key="ButtonStyle" TargetType="Button" BasedOn="{StaticResource {x:Type Button}}" />
    <Style x:Key="ComboBoxStyle" TargetType="ComboBox" BasedOn="{StaticResource {x:Type ComboBox}}" />
</UserControl.Resources>

then the toolbar code can be the following

                <ToolBar>
                    Block Template:
                    <ComboBox Style="{StaticResource ComboBoxStyle}"/>
                    <Button Content="Generate!" Style="{StaticResource ButtonStyle}"/>
                </ToolBar>

this successfully applies the main application style to the controls inside the < ToolBar>

Solution 4

In Xaml, you can override this by setting a style explicitly. In code-behind, you can also set the style explicitly.

<TextBox Style="{StaticResource SomeOtherStyle}"/>

myTextBox.Style = Application.Resources["SomeOtherStyle"];

View more solutions