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="LightBlue" Offset="0.3"></GradientStop> <GradientStop Color="Blue" Offset="1"></GradientStop> </LinearGradientBrush> </Border.Background> </Border> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter TargetName="bdr" Property="Background"> <Setter.Value> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <GradientStop Color="LightBlue" Offset="0"></GradientStop> <GradientStop Color="Blue" Offset="1"></GradientStop> </LinearGradientBrush> </Setter.Value> </Setter> <Setter TargetName="tbk" Property="Foreground" Value="LightYellow"></Setter> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <!--TextBox样式--> <Style TargetType="TextBox"> <Setter Property="FontFamily" Value="Times New Roman"></Setter> <Setter Property="FontSize" Value="14"></Setter> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="TextBox"> <Border BorderBrush="Blue" BorderThickness="0.5" CornerRadius="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 CornerRadius="5" BorderBrush="Blue" 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="LightSkyBlue" BorderThickness="0" CornerRadius="5"> <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="BlueViolet"></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="Times New Roman"/> <Setter Property="FontSize" Value="14"/> </Style></ResourceDictionary>

仔细观察上面定义的样式，你会发现在定义Window样式的时候指定了Key，其他的Control样式却没有指定Key。大家都知道，如果没有给Style指定Key，那么这个Style会应用到所有目标类型(TargetType)为指定类型的Control。请看下面一段文字：

因为在换肤的过程中，需要动态加载Window的样式，所以用DynamicResource作绑定Style="{DynamicResource WindowStyle}"。

App.xaml

程序运行的时候，默认加载规则样式的皮肤。

<Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Dictionary\Skin.RegularStyle.xaml"></ResourceDictionary> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources>

后台代码

/// <summary> /// MenuItem的执行方法 /// </summary> /// <param name="parameter"></param> private void RelayMenuItemEvent(object parameter) { if (parameter.ToString() == RegularStyle) { ChangeSkinResource(Skins[0]); } else if (parameter.ToString() == RoundedCornerStyle) { ChangeSkinResource(Skins[1]); } } /// <summary> /// 更换皮肤资源 /// </summary> /// <param name="skin"></param> private void ChangeSkinResource(ResourceDictionary skin) { if (Application.Current.Resources.MergedDictionaries[0].Source.IsAbsoluteUri) { if (Application.Current.Resources.MergedDictionaries[0].Source.OriginalString != skin.Source.OriginalString) { Application.Current.Resources.MergedDictionaries[0] = skin; } } else { if (Application.Current.Resources.MergedDictionaries[0].Source.OriginalString.ToString('\\') != skin.Source.OriginalString.ToString('/')) { Application.Current.Resources.MergedDictionaries[0] = skin; } } }

运行的时候在MainWindow上右键选择皮肤样式，就可以换肤了。

源码下载：http://xiazai.jb51.net/201610/yuanma/WPFSkin(jb51.net).rar

链接：stackoverflow

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