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How to: Use the FontSizeConverter Class

This example shows how to create an instance of FontSizeConverter and use it to change a font size.

The example defines a custom method called changeSize that converts the contents of a ListBoxItem, as defined in a separate Extensible Application Markup Language (XAML) file, to an instance of Double, and later into a String. This method passes the ListBoxItem to a FontSizeConverter object, which converts the Content of a ListBoxItem to an instance of Double. This value is then passed back as the value of the FontSize property of the TextBlock element.

This example also defines a second custom method that is called changeFamily. This method converts the Content of the ListBoxItem to a String, and then passes that value to the FontFamily property of the TextBlock element.

This example does not run. For the complete sample, see Using the FontSizeConverter Class Sample.

        private void changeSize(object sender, SelectionChangedEventArgs args)
        {
			ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
			FontSizeConverter myFontSizeConverter = new FontSizeConverter();
			text1.FontSize = (Double)myFontSizeConverter.ConvertFromString(li.Content.ToString());
        }

        private void changeFamily(object sender, SelectionChangedEventArgs args)
		{
			ListBoxItem li2 = ((sender as ListBox).SelectedItem as ListBoxItem);
            text1.FontFamily = new System.Windows.Media.FontFamily(li2.Content.ToString());
        }
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