更改按钮背景。

<Button FontSize="16" FontWeight="Bold">Click the Background
<Button.Template>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}">
<ContentPresenter/>
</Border>
</ControlTemplate>
</Button.Template>

<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="Blue"/>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="Background" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>