在我们前面介绍资源的时候，我们提到了样式表，如果你之前是做Web开发的，你会发现Style有点类似于Web中的CSS。

控件级别样式

我们可以在控件级别定义自己的样式，控件级别的样式是优先级最高的

<Window x:Class="Example_06.SelfControlStyle"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:Example_06"mc:Ignorable="d" Title="SelfControlStyle" Height="450" Width="800"><Grid><TextBlock Text="TextBlock"><TextBlock.Style><Style><Setter Property="TextBlock.Foreground" Value="Red"></Setter><Setter Property="TextBlock.FontSize" Value="100"></Setter></Style></TextBlock.Style></TextBlock></Grid>
</Window>

我们为控件定义了自己的样式

父级控件级别样式

<Window x:Class="Example_06.ParentControlStyle"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d" Title="MainWindow" Height="450" Width="800"><StackPanel><StackPanel.Resources><Style TargetType="Button"><Setter Property="Background" Value="Green"></Setter><Setter Property="Foreground" Value="White"></Setter><Setter Property="FontSize"  Value="40"></Setter></Style></StackPanel.Resources><Button>Button 1</Button><Button>Button 2</Button><Button Background="red">Button 3</Button></StackPanel>
</Window>

上面例子中我们在StackPanel中定义了样式，会应用容器里面所有Button，当然你也可以在Button级别覆盖父控件的样式

Window窗体级别样式

<Window x:Class="Example_06.WindowControlStyle"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:Example_06"mc:Ignorable="d" Title="WindowControlStyle" Height="450" Width="800"><Window.Resources><Style TargetType="Button"><Setter Property="Background" Value="Green"></Setter><Setter Property="Foreground" Value="White"></Setter><Setter Property="FontSize"  Value="30"></Setter></Style></Window.Resources><StackPanel><Button>Button 1</Button><Button>Button 2</Button><Button Background="red">Button 3</Button></StackPanel>
</Window>

我们将样式移到Window窗体级别，会将样式应用到该窗体的所有Button

应用程序级别样式

<Application x:Class="Example_06.App"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:Example_06"StartupUri="ParentControlStyle.xaml"><Application.Resources><Style TargetType="Button"><Setter Property="Background" Value="Green"></Setter><Setter Property="Foreground" Value="White"></Setter><Setter Property="FontSize"  Value="20"></Setter></Style></Application.Resources>
</Application>

我们可以将样式定义为应用程序级别样式，样式表的优先级子节点样式可以覆盖父节点的样式，从下往上查找