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How to: Use a Cached Element as a Brush

Use the BitmapCacheBrush class to reuse a cached element efficiently. To cache an element, create a new instance of the BitmapCache class and assign it to the element's CacheMode property.

The following code example shows how to reuse a cached element. The cached element is an Image control that displays a large image. The Image control is cached as a bitmap by using the BitmapCache class, and the cache is reused by assigning it to a BitmapCacheBrush. The brush is assigned to the background of twenty-five buttons to show efficient reuse.

<Window x:Class="BitmapCacheBrushDemo.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window1"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
        Height="300" Width="300" >
    <Window.Resources>
        <RichTextBox x:Key="cachedRichTextBox"  >
            <RichTextBox.CacheMode>
                <BitmapCache EnableClearType="True" RenderAtScale="1" SnapsToDevicePixels="True" />
            </RichTextBox.CacheMode>
        </RichTextBox>

        <BitmapCacheBrush x:Key="cachedRichTextBoxBrush" Target="{StaticResource cachedRichTextBox}">
            <BitmapCacheBrush.BitmapCache>
                <BitmapCache EnableClearType="False" RenderAtScale="0.4" SnapsToDevicePixels="False" />
            </BitmapCacheBrush.BitmapCache>
        </BitmapCacheBrush>        
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button1" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button2" Grid.Column="1" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button3" Grid.Column="2" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button4" Grid.Column="3" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button5" Grid.Column="4" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button6" Grid.Row="1" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="1" Name="button7" Grid.Row="1" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="2" Name="button8" Grid.Row="1" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="3" Name="button9" Grid.Row="1" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="4" Name="button10" Grid.Row="1" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button11" Grid.Row="2" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="1" Name="button12" Grid.Row="2" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="2" Name="button13" Grid.Row="2" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="3" Name="button14" Grid.Row="2" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="4" Name="button15" Grid.Row="2" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button16" Grid.Row="3" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="1" Name="button17" Grid.Row="3" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="2" Name="button18" Grid.Row="3" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="3" Name="button19" Grid.Row="3" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="4" Name="button20" Grid.Row="3" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Name="button21" Grid.Row="4" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="1" Name="button22" Grid.Row="4" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="2" Name="button23" Grid.Row="4" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="3" Name="button24" Grid.Row="4" FontWeight="Bold" />
        <Button Background="{StaticResource cachedRichTextBoxBrush}" Content="Button" Grid.Column="4" Name="button25" Grid.Row="4" FontWeight="Bold" />
    </Grid>
</Window>
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