如何覆盖ControlTemplate中的属性？

Question

我有以下XAML:

<Window x:Class="WpfTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="227" Width="391">
    <Window.Resources>
        <ControlTemplate x:Key="PentagonButton" TargetType="{x:Type Button}">
            <Grid>
                <Path Data="M 0,-1 L -.95,-.3 L -.58,.8 L .58,.8 L .95,-.3 Z" Stroke="Black" Stretch="Uniform" Fill="Red" />
                <Viewbox>
                    <ContentPresenter Margin="20" />
                </Viewbox>
            </Grid>
        </ControlTemplate>
    </Window.Resources>
    <Grid>
        <Button Content="red" Margin="12,19,0,0" Template="{StaticResource PentagonButton}" HorizontalAlignment="Left" Width="166" Height="151" VerticalAlignment="Top" />        
        <Button Content="blue" Margin="178,19,0,0" Template="{StaticResource PentagonButton}" Height="151" VerticalAlignment="Top" HorizontalAlignment="Left" Width="173" />        
    </Grid>
</Window>

由于Fill ="Red",显然所有按钮都有红色填充/背景颜色.我想将这个模板用于几个按钮,但每个按钮都有不同的填充颜色,在设计时已知.设置背景颜色无效,因此我必须更改填充颜色,但我无法在实际按钮定义中再次定义Path属性.如何在XAML中访问和覆盖此属性？

Answer 1

不要直接使用模板.指定样式并使用它.

即

 <Style x:Key="PentagonButton" TargetType="{x:type Button}">
 <Setter Property="Background" Value="Red"/>
    <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Button}">
                <Grid>
                    <Path Data="M 0,-1 L -.95,-.3 L -.58,.8 L .58,.8 L .95,-.3 Z" Stroke="Black" Stretch="Uniform" Fill="{TemplateBinding Background}" />
                    <Viewbox>
                        <ContentPresenter Margin="20" />
                    </Viewbox>
                </Grid>
            </ControlTemplate>
    </Setter.Value>
    </Setter>
    </Style>

然后像这样使用它:

<Grid>
        <Button Content="red" Margin="12,19,0,0" Style="{StaticResource PentagonButton}" HorizontalAlignment="Left" Width="166" Height="151" VerticalAlignment="Top" />        
        <Button Content="blue" Margin="178,19,0,0" Style="{StaticResource PentagonButton}" Height="151" VerticalAlignment="Top" HorizontalAlignment="Left" Width="173" Background="Blue" />        
    </Grid>