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WPF换肤的设计原理，利用资源字典为每种皮肤资源添加不同的样式，在后台切换皮肤资源文件。
截图
上图中，第一张图采用规则样式，第二张图采用不规则样式，截图的时候略有瑕疵。
资源字典
规则样式资源Skin.RegularStyle.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<!--Window样式-->
<Style x:Key="WindowStyle" TargetType="Window">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Window">
<Border BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="Green" Offset="0"></GradientStop>
<GradientStop Color="LightGreen" Offset="0.4"></GradientStop>
<GradientStop Color="White" Offset="1"></GradientStop>
</LinearGradientBrush>
</Border.Background>
<ContentPresenter></ContentPresenter>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--Button样式-->
<Style TargetType="Button">
<Setter Property="Width" Value="70"></Setter>
<Setter Property="Height" Value="23"></Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border Name="bdr" Cursor="Arrow"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="LightGreen" Offset="0.3"></GradientStop>
<GradientStop Color="Green" Offset="1"></GradientStop>
</LinearGradientBrush>
</Border.Background>
<TextBlock Name="tbk" Background="Transparent" Foreground="DarkGreen" TextAlignment="Center"
Text="{TemplateBinding Content}"></TextBlock>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="bdr" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="LightGreen" Offset="0"></GradientStop>
<GradientStop Color="Green" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="tbk" Property="Foreground" Value="White"></Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--TextBox样式-->
<Style TargetType="TextBox">
<Setter Property="FontFamily" Value="SketchFlow Print"/>
<Setter Property="FontSize" Value="14"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
<Border BorderBrush="DarkGreen" BorderThickness="0.5">
<ScrollViewer x:Name="PART_ContentHost" Focusable="false"
HorizontalScrollBarVisibility="Hidden"
VerticalScrollBarVisibility="Hidden"></ScrollViewer>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--ContextMenu样式-->
<Style TargetType="ContextMenu">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContextMenu">
<Border BorderBrush="Green" BorderThickness="1">
<ItemsPresenter/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--MenuItem样式-->
<Style TargetType="MenuItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="MenuItem">
<Border Name="border" Background="LightGreen" BorderThickness="0">
<TextBlock Name="tbk" Background="Transparent" Padding="5,5"
Text="{TemplateBinding Header}"></TextBlock>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="border" Property="Background" Value="Green"></Setter>
<Setter TargetName="tbk" Property="Foreground" Value="White"></Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--TextBlock样式-->
<Style TargetType="TextBlock">
<Setter Property="FontFamily" Value="SketchFlow Print"/>
<Setter Property="FontSize" Value="14"/>
</Style>
</ResourceDictionary>
不规则样式资源Skin.RoundedCornerStyle.xaml
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<!--Window样式-->
<Style x:Key="WindowStyle" TargetType="Window">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Window">
<Grid Margin="10">
<Rectangle Fill="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
RadiusX="5" RadiusY="5">
<Rectangle.Effect>
<DropShadowEffect BlurRadius="10" Color="Black" Direction="0" Opacity="0.8"
RenderingBias="Performance" ShadowDepth="0"/>
</Rectangle.Effect>
</Rectangle>
<Border BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
SnapsToDevicePixels="True" CornerRadius="5">
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="Blue" Offset="0"></GradientStop>
<GradientStop Color="LightBlue" Offset="0.4"></GradientStop>
<GradientStop Color="White" Offset="1"></GradientStop>
</LinearGradientBrush>
</Border.Background>
<ContentPresenter></ContentPresenter>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!--Button样式-->
<Style TargetType="Button">
<Setter Property="Width" Value="70"></Setter>
<Setter Property="Height" Value="23"></Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Border Name="bdr" CornerRadius="5" Cursor="Hand"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<TextBlock Name="tbk" Background="Transparent" Foreground="Yellow" TextAlignment="Center"
Text="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Content}"></TextBlock>
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="