Silverlight实用窍门系列：72.Silverlight的Implicit Style、自定义主题皮肤、系统主题皮肤

　　本文实例基于Silverlight实用窍门系列：71.Silverlight的Style基础之上。

　　一、Implicit Style(隐式样式)：是不需要制定x:Key属性的Style，它的作用于是所有指定TagetType的控件，而不需要在具体的每个控件去指定其Style="{StaticResource KeyName}"。如以下代码的Style就没有指定x:Key属性，也不需要在任何ListBox控件上指定Style，会自动作用于其上：

    <Style TargetType="ListBox">
        <Setter Property="FontSize" Value="12"></Setter>
        <Setter Property="Foreground" Value="Blue"></Setter>
        <Setter Property="FontFamily" Value="Lucida Sans Unicode"></Setter>
        <Setter Property="ItemTemplate">
            <Setter.Value>
                <DataTemplate>
                    <StackPanel Orientation="Vertical" >
                        <StackPanel Orientation="Horizontal" Margin="5" Width="380">
                            <TextBlock Text="{Binding ArtName}" Margin="5 10 0 0"></TextBlock>
                            <TextBox Text="{Binding ArtContent}" Name="tbName" Margin="5"></TextBox>
                            <TextBox Text="{Binding ArtAuthor}" Margin="5"></TextBox>
                            <TextBlock Text="{Binding ArtUpdateTime}" Margin="5 10 0 0"></TextBlock>
                        </StackPanel>
                        <StackPanel Orientation="Horizontal"  Visibility="Collapsed">
                            <TextBox Text="{Binding ArtContent}" Width="280"></TextBox>
                        </StackPanel>
                    </StackPanel>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>

　　二、自定义主题皮肤

　　在此例中我们将以上样式放入三个不同的ResourceDictionary资源字典文件中，并且修改其定义的样式值，然后通过后台动态加载资源字典的方式动态更换主题皮肤。具体代码如下：

            ResourceDictionary redDic = new ResourceDictionary();
            redDic.Source = new Uri("/SLStyle;component" + Url, UriKind.RelativeOrAbsolute);
            Application.Current.Resources.MergedDictionaries.Clear();
            Application.Current.Resources.MergedDictionaries.Add(redDic);

　　三、更换为系统皮肤

　　本例采用Silverlight Toolkit下面的皮肤，其路径如下：*\Silverlight\v4.0\Toolkit\Apr10\Themes\Xaml\，本文选则其中三种皮肤进行加载即可，需要引入以下一些DLL和Xaml文件，然后采用自定义主题皮肤的方式进行更换。

　　最后我们来看其具体Xaml和Xaml.cs文件代码如下：

    <Grid x:Name="LayoutRoot"   Background="White"  DataContext="{StaticResource SourceList}">
        <ListBox x:Name="lbRes" ItemsSource="{Binding ArticleList}" 
                 HorizontalAlignment="Left" VerticalAlignment="Top"
                 Margin="0 80 0 0 " Height="400"  >
        </ListBox>
        <Button Content="红色主题" Height="23" HorizontalAlignment="Left" Margin="22,12,0,0"
                Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
        <Button Content="蓝色主题" Height="23" HorizontalAlignment="Left" Margin="157,12,0,0"
                Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" />
        <Button Content="绿色主题" Height="23" HorizontalAlignment="Left" Margin="284,12,0,0"
                Name="button3" VerticalAlignment="Top" Width="75" Click="button3_Click" />
        <Button Content="系统主题1" Height="23" HorizontalAlignment="Left" Margin="22,47,0,0"
                Name="button4" VerticalAlignment="Top" Width="75" Click="button4_Click" />
        <Button Content="系统主题2" Height="23" HorizontalAlignment="Left" Margin="157,47,0,0"
                Name="button5" VerticalAlignment="Top" Width="75" Click="button5_Click" />
        <Button Content="系统主题3" Height="23" HorizontalAlignment="Left" Margin="284,47,0,0" 
                Name="button6" VerticalAlignment="Top" Width="75" Click="button6_Click" />
    </Grid>

    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            ChangeStyle("/Styles/RedDic.xaml");
        }

        private void ChangeStyle(string Url)
        {
            ResourceDictionary redDic = new ResourceDictionary();
            redDic.Source = new Uri("/SLStyle;component" + Url, UriKind.RelativeOrAbsolute);
            Application.Current.Resources.MergedDictionaries.Clear();
            Application.Current.Resources.MergedDictionaries.Add(redDic);
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            ChangeStyle("/Styles/RedDic.xaml");
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            ChangeStyle("/Styles/BlueDic.xaml");
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            ChangeStyle("/Styles/GreenDic.xaml");
        }

        private void button6_Click(object sender, RoutedEventArgs e)
        {
            ChangeStyle("/SysStyles/System.Windows.Controls.Theming.SystemColors.xaml");
        }

        private void button4_Click(object sender, RoutedEventArgs e)
        {
            ChangeStyle("/SysStyles/System.Windows.Controls.Theming.TwilightBlue.xaml");
        }

        private void button5_Click(object sender, RoutedEventArgs e)
        {
            ChangeStyle("/SysStyles/System.Windows.Controls.Theming.WhistlerBlue.xaml");
        }
    }

　　效果图如下，注意在本例中没有设置主题样式的ListBox模板，大家可以自己显式设置ListBox的ItemsTemplate，如需源码请点击 SLThemeStyle.zip 下载。