To freeze a Freezable
object declared in markup, you use the Freeze
attribute defined in XML namespace http://schemas.microsoft.com/winfx/2006/xaml/presentation/options
.
In the following example, a SolidColorBrush
is declared as a page resource and frozen. It is then used to set the background of a button.
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:po="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="po">
<Page.Resources>
<!-- This brush is frozen -->
<SolidColorBrush x:Key="MyBrush" po:Freeze="True" Color="Red" />
</Page.Resources>
<!-- Use the frozen brush -->
<Button Background="{StaticResource MyBrush}">Click Me</Button>
</Page>
Source: Freezable Objects Overview
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