WPF: reverting brush to default/original

Question

I'm a complete newbie at WPF.

At the moment I'm making a usercontrol for form elements called "LabeledTextbox" which contains a label, a textbox and a textblock for errormessages.

When the using code adds an errormessage, I want to put the border of the textbox in red. But, when the errormessage gets removed, I'd like to turn back to the default bordercolor of the textbox. I feel there must be a very easy way to do this.

My code:

(in public partial class LabeledTextbox : UserControl)

public string ErrorMessage
{
    set
    {
        if (string.IsNullOrEmpty(value))
        {
            _textbox.BorderBrush = Brushes.Black; //How do I revert to the original color in the most elegant way?
        }
        else
        {
            _textbox.BorderBrush = Brushes.Red;
        }

        _errorMessage.Text = value;
    }
}

score 51 · Accepted Answer · answered Aug 20 '09 at 14:20

51

You could use

_textBox.ClearValue(TextBox.BorderBrushProperty);

That will remove the directly assigned value and go back to the value defined by the style or template.

answered Aug 20 '09 at 14:20

Daniel

15,944
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2

great, thanks! *adds dependencyproperty research to the to-do list* – Thomas Stock Aug 20 '09 at 14:25
Thanks, very helpful article. I tried storing the default brush by the brush.clone method but according to .net no brush exists when its system default. Thank you! – JustinKaz May 27 '10 at 16:34
2

This didn't work for me. I set background to Aquamarine when I want to draw attention to it. I tried to use the ClearValue to revert it back but it stayed as Aquamarine. Looking at this post: ( http://wpf.2000things.com/tag/clearvalue/) told me that ClearValue reverts it back to the last assigned value. So I tried setting the Background property to Nothing and it worked. The label background was now the default color. – tolsen64 Apr 09 '15 at 17:27

score 15 · Answer 2 · edited Oct 30 '15 at 19:35

15

You can grab the default colours from the class SystemColors

Here is the list of all system colours: http://msdn.microsoft.com/de-de/library/system.windows.systemcolors.aspx

Default background colour of the client area:

     _textbox.Background = SystemColors.WindowBrush;

Default text colour inside the client area:

     _textbox.SystemColors.WindowTextBrush

edited Oct 30 '15 at 19:35

Chris Schiffhauer

17,102
15
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88

answered Oct 05 '11 at 14:41

Beauty

865
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1

This answer is useful in MVVM environment. There I cannot clear the BorderBrushProperty as in the otherwise good answer by Daniel. But setting a controls´ background to its default brush works by returning the brush explicitly in a property on the viewmodel. – Julian Jul 25 '16 at 15:44

score 4 · Answer 3 · answered Aug 20 '15 at 05:14

I may be late to the party, but for future readers, you can also use Button.BackgroundProperty.DefaultMetadata.DefaultValue for this purpose. This is especially useful when you're using a Converter where you need to return a value and therefore cannot use ClearValue() call.

score 0 · Answer 4 · answered Aug 20 '09 at 14:24

0

Does this work? Setting it to black is better than using the ClearValue method

public string ErrorMessage
{
    set
    {
        if (string.IsNullOrEmpty(value))
        {
            _textbox.Background = Brushes.Black;
        }
        else
        {
            _textbox.Background = Brushes.Red;
        }

        _errorMessage.Text = value;
    }
}

answered Aug 20 '09 at 14:24

Athiwat Chunlakhan

7,589
14
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72

oh sorry, I made a mistake in my post. It doesn't because the default is a gradient color. – Thomas Stock Aug 20 '09 at 14:37
@Thomas Stock :0 Never tested it. So also sorry. – Athiwat Chunlakhan Aug 20 '09 at 14:39

score 0 · Answer 5 · answered May 30 '11 at 12:08

Just store the default settings. Here a code excample.

        System.Windows.Media.Brush save;

        private void Window_Loaded(object sender, RoutedEventArgs e)
                {
          //Store the default background 
        save = testButton.Background;

        }


        private void ChangeBackground(){

        testButton.Background = Brushes.Red;

        }

        private void restoreDefaultBackground(){

        //Restore default Backgroundcolor

        testButton.Background = save;

        }

WPF: reverting brush to default/original

5 Answers5

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