WPF:换肤

看了一篇博客，觉得样式很好看，就自己动手做了一下，做个总结。

效果：

  

选择不同的图片背景就会改变：

 

直接上代码：

每个Theme对应一张图，除了图的名称不同之外，Theme？.xaml中的内容相同：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <ImageBrush x:Key="WindowBack" ImageSource="../Images/Theme1.jpg" Stretch="UniformToFill"/> 
 
</ResourceDictionary>

 窗口的背景为动态资源，且有一个默认值在App.xaml中（<ResourceDictionary Source="Themes/Theme3.xaml"/>）：

<Window x:Class="ChangeTheme.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="800" Width="800"  WindowStyle="None" WindowState="Maximized"  
        Background="{DynamicResource WindowBack}">
    <Window.Resources>
        <ResourceDictionary>
            <Style x:Key="ScrollViewerStyle1" TargetType="{x:Type ScrollViewer}">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ScrollViewer}">
                            <Grid>
                                <Path Data="M101,0.5 L112,11.5 194.5,11.5 C197.26142,11.500001 199.5,13.738577 199.5,16.500001 L199.5,155.5 C199.5,158.26143 197.26142,160.5 194.5,160.5 L5.5,160.5 C2.7385788,160.5 0.5,158.26143 0.5,155.5 L0.5,16.500001 C0.5,13.738577 2.7385788,11.500001 5.5,11.5 L89.999999,11.5 z" 
                                      Fill="White" Stretch="Fill" Stroke="SeaGreen" StrokeThickness="0.5">
                                    <!--B27A7A7A-->
                                        <Path.Effect>
                                        <DropShadowEffect Opacity="0.7" ShadowDepth="2" Direction="310"/>
                                    </Path.Effect>
                                </Path>
                                <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </Grid>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </ResourceDictionary>
    </Window.Resources>
    <Grid Height="320" Width="400" HorizontalAlignment="Right" VerticalAlignment="Top">

        <ScrollViewer Width="350" Style="{DynamicResource ScrollViewerStyle1}"  >
            <WrapPanel Margin="15,50" x:Name="ImagePanel">
            </WrapPanel>
        </ScrollViewer>
    </Grid>
</Window>

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            LoadBackgroundImages();
        }

        private void LoadBackgroundImages()
        {
             string path = @"../../Images";
            var images =Directory.GetFiles(System.IO.Path.Combine(path)) ;
            if (images.Length == 0) return;

            foreach (var img in images)
            {
                Image imgTheme = new Image()
                {
                    Width = 100,
                    Stretch = Stretch.Fill,
                    Height = 60,
                    Margin = new Thickness(2)
                };
                imgTheme.Name = System.IO.Path.GetFileNameWithoutExtension(img);
                imgTheme.Tag = img;
                imgTheme.Source = new BitmapImage(new Uri(img, UriKind.Relative));
                imgTheme.MouseLeftButtonDown += new MouseButtonEventHandler(imgTheme_MouseLeftButtonDown);
                ImagePanel.Children.Add(imgTheme);
            }
        }

        private void imgTheme_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            Image image = sender as Image;
             if (image != null && image.Source != null)
            {
                  string imgName = image.Name;
                  ResourceHelper.LoadResource("pack://application:,,,/ChangeTheme;component/Themes/" + imgName + ".xaml");
              }

        }
    }

    static class ResourceHelper
    {
        public static void LoadResource(string fileName)
        {
            try
            {
                Application.Current.Resources.MergedDictionaries[0] = new ResourceDictionary()
                {
                    Source = new Uri(fileName, UriKind.RelativeOrAbsolute)
                };
            }
            catch (Exception ex)
            {
                return;
            }
        }
    }