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

Answer 1

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

Answer 2

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;
    }
}

Answer 3

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;

        }

Answer 4

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.

Answer 5

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.