WPF 样式Style

 如果我们的程序有三个这样的按键，一般我们会这样写

    <StackPanel>
        <!--按键的背景色为Azure蔚蓝色背景色为Coral珊瑚色字体为Arial加粗字体大小为16-->
        <Button Content="Button1" Background="Azure" Foreground="Coral" FontFamily="Arial" FontWeight="Bold" FontSize="16" />
        <Button Content="Button2" Background="Azure" Foreground="Coral" FontFamily="Arial" FontWeight="Bold" FontSize="16" />
        <Button Content="Button3" Background="Azure" Foreground="Coral" FontFamily="Arial" FontWeight="Bold" FontSize="16" />
    </StackPanel>

但是如果我们的程序有很多这样的按键都这样写会显得很冗余，于是我们可以定义一个样式Style，让所有按键都用这种样式

    <Window.Resources>
        <Style x:Key="ButtonStyle">
            <!--按键的背景色为Azure蔚蓝色背景色为Coral珊瑚色字体为Arial加粗字体大小为16-->
            <Setter Property="Control.FontFamily" Value="Arial"></Setter>
            <Setter Property="Control.Background" Value="Azure"></Setter>
            <Setter Property="Control.Foreground" Value="Coral"></Setter>
            <Setter Property="Control.FontWeight" Value="Bold"></Setter>
            <Setter Property="Control.FontSize" Value="16"></Setter>
        </Style>
    </Window.Resources>
    <StackPanel>
        <Button Content="Button1" Style="{StaticResource ButtonStyle}" />
        <Button Content="Button2" Style="{StaticResource ButtonStyle}" />
        <Button Content="Button3" Style="{StaticResource ButtonStyle}" />
    </StackPanel>

这样代码就会显得简洁一些，细心的小伙伴儿发现所有的按键都用Style="{StaticResource ButtonStyle}"来指定样式，感觉还是略有一点冗余，那我们还可以继续让代码简洁一些，把

<Style x:Key="ButtonStyle">样式里的键值换成目标类型TargetTpye="Button",

    <Window.Resources>
        <Style TargetType="Button">
            <!--按键的背景色为Azure蔚蓝色背景色为Coral珊瑚色字体为Arial加粗字体大小为16-->
            <Setter Property="Control.FontFamily" Value="Arial"></Setter>
            <Setter Property="Control.Background" Value="Azure"></Setter>
            <Setter Property="Control.Foreground" Value="Coral"></Setter>
            <Setter Property="Control.FontWeight" Value="Bold"></Setter>
            <Setter Property="Control.FontSize" Value="16"></Setter>
        </Style>
    </Window.Resources>
    <StackPanel>
        <Button Content="Button1"  />
        <Button Content="Button2"  />
        <Button Content="Button3"  />
    </StackPanel>

这样三个按键的代码就非常简洁了，但是有的小伙伴儿就想让第一个和第三个按键用上面的样式，第二个不适用样式，我们可以这样该

    <Window.Resources>
        <Style TargetType="Button">
            <!--按键的背景色为Azure蔚蓝色背景色为Coral珊瑚色字体为Arial加粗字体大小为16-->
            <Setter Property="Control.FontFamily" Value="Arial"></Setter>
            <Setter Property="Control.Background" Value="Azure"></Setter>
            <Setter Property="Control.Foreground" Value="Coral"></Setter>
            <Setter Property="Control.FontWeight" Value="Bold"></Setter>
            <Setter Property="Control.FontSize" Value="16"></Setter>
        </Style>
    </Window.Resources>
    <StackPanel>
        <Button Content="Button1"  />
        <Button Content="Button2" Style="{x:Null}" />
        <Button Content="Button3"  />
    </StackPanel>

效果如下