WPF的样式(Style)继承

参考自http://www.cnblogs.com/SkyD/archive/2008/08/09/1264294.html，非常感谢。

用Style的BaseOn属性可以实现WPF样式的显式继承，例如，有一个基样式：

<Style x:Key="BASE">
      <Setter Property="Control.Background">
          <Setter.Value>
             <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                <GradientStop Offset="0" Color="Green"/>
                <GradientStop Offset="0.5" Color="Blue"/>
                <GradientStop Offset="1" Color="Red"/>
             </LinearGradientBrush>
          </Setter.Value>
      </Setter>
    </Style>
下面分别定义2个样式继承它：

<Style BasedOn="{StaticResource BASE}" TargetType="{x:Type Button}">
      <Setter Property="BorderBrush" Value="Red"></Setter>
    </Style>
    
    <Style BasedOn="{StaticResource BASE}" TargetType="{x:Type TextBox}">
      <Setter Property="BorderBrush" Value="Black"></Setter>
    </Style>

而且还可以继续继承上面定义的样式，例如对Button的样式再次扩展：

<Style BasedOn="{StaticResource {x:Type Button}}" x:Key="NewButton" TargetType="{x:Type Button}">
      <Setter Property="Margin" Value="10,0,0,0"></Setter>
    </Style>

下面使用这些样式：

<Grid>  
    <StackPanel Width="250" Height="400">
      <Button Height="30"></Button>
      <TextBox Height="30"></TextBox>
      <Button Style="{StaticResource NewButton}" Height="30"/>
    </StackPanel>
  </Grid>

完整的代码如下：

<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Page.Resources>
    <Style x:Key="BASE">
      <Setter Property="Control.Background">
          <Setter.Value>
             <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                <GradientStop Offset="0" Color="Green"/>
                <GradientStop Offset="0.5" Color="Blue"/>
                <GradientStop Offset="1" Color="Red"/>
             </LinearGradientBrush>
          </Setter.Value>
      </Setter>
    </Style>

    <Style BasedOn="{StaticResource BASE}" TargetType="{x:Type Button}">
      <Setter Property="BorderBrush" Value="Red"></Setter>
    </Style>
    
    <Style BasedOn="{StaticResource BASE}" TargetType="{x:Type TextBox}">
      <Setter Property="BorderBrush" Value="Black"></Setter>
    </Style>
    
    <Style BasedOn="{StaticResource {x:Type Button}}" x:Key="NewButton" TargetType="{x:Type Button}">
      <Setter Property="Margin" Value="10,0,0,0"></Setter>
    </Style>
  </Page.Resources>
  <Grid>  
    <StackPanel Width="250" Height="400">
      <Button Height="30"></Button>
      <TextBox Height="30"></TextBox>
      <Button Style="{StaticResource NewButton}" Height="30"/>
    </StackPanel>
  </Grid>
</Page>

运行后的效果如下图：