WPF 文件级资源（类似与使用CSS文件，然后引用CSS文件）

1. 文件级资源：定义在资源字典的XAML文件中，添加“资源字典（Resource Dictionary）”类型的项

文件名为Dictionary1.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <SolidColorBrush Color="Red" x:Key="redBrush"></SolidColorBrush>
</ResourceDictionary>

以下是WIndow1.xaml文件

<Window x:Class="WpfWindowAndDialog.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" WindowStartupLocation="CenterScreen">
    <Window.Resources>
        <ResourceDictionary Source="Dictionary1.xaml"></ResourceDictionary>
    </Window.Resources>
    <Grid>
        <Button Height="23" HorizontalAlignment="Left" Background="{StaticResource ResourceKey=redBrush}"  

10　　　　  Margin="10,10,0,0" Name="button1" VerticalAlignment="Top"  >Button</Button>
    </Grid>
</Window>

类似与使用CSS文件，然后引用CSS文件.可以有多个资源文件，这样便于管理

2.对象（控件）级资源：定义在某个ContentControl中，作为其子容器、子控件共享的资源

定义在资源字典的XAML文件中，添加“资源字典（Resource Dictionary）”类型的项

文件名为Dictionary1.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <SolidColorBrush Color="Red" x:Key="redBrush"></SolidColorBrush>
</ResourceDictionary>

Window2.xaml文件

<Window x:Class="WpfWindowAndDialog.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" WindowStartupLocation="CenterScreen">  
    <Grid>
        <Grid.Resources>
            <ResourceDictionary Source="Dictionary1.xaml"></ResourceDictionary>
        </Grid.Resources>
        <Button Height="23" HorizontalAlignment="Left" Background="{StaticResource ResourceKey=redBrush}"  Margin="10,10,0,0" Name="button1" VerticalAlignment="Top" Width="75" >Button</Button>
    </Grid>
</Window>

3.将图形作为一种资源来使用

<Window x:Class="WpfWindowAndDialog.Window3"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" WindowStartupLocation="CenterScreen">  
    <Window.Resources>
        <Ellipse  x:Key="myEllipse"  Fill="Yellow" Height="100"/>
    </Window.Resources>
    <StackPanel>
          <StaticResource ResourceKey="myEllipse"/>
     </StackPanel>
</Window>

(2)重用绘图资源

<Window x:Class="WpfWindowAndDialog.Window4"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" WindowStartupLocation="CenterScreen">  
    <Window.Resources>
        <GeometryDrawing x:Key="drawing" Brush="Green">
            <GeometryDrawing.Geometry>
                <EllipseGeometry RadiusX="200" RadiusY="10"/>
            </GeometryDrawing.Geometry>
        </GeometryDrawing>
        <DrawingBrush x:Key="dbrush" Drawing="{StaticResource drawing}"></DrawingBrush>
    </Window.Resources>
    <StackPanel>
        <Rectangle Width="250" Height="50" Fill="{StaticResource dbrush}">
        </Rectangle>
        <Rectangle Width="250" Height="50" Fill="{StaticResource dbrush}">
        </Rectangle>
    </StackPanel>
</Window>

4.皮肤与主题

两款非常简单的皮肤文件

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="{x:Type Button}">
        <Setter Property="Background" Value="Blue"/>
        <Setter Property="Foreground" Value="White"/>
    </Style>
    <SolidColorBrush x:Key="appBackground" Color="#EEF"/>
</ResourceDictionary>

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="{x:Type Button}">
        <Setter Property="Background" Value="Green"/>
        <Setter Property="Foreground" Value="White"/>
    </Style>
    <SolidColorBrush x:Key="appBackground" Color="#EEF"/>
</ResourceDictionary>

引用皮肤的文件

<Window x:Class="Chapter12.<Window x:Class="Chapter12.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" Background="{DynamicResource appBackground}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <RadioButton x:Name="chooseGreenSkin" Grid.Row="0" Content="Green"/>
        <RadioButton x:Name="chooseBlueSkin" Grid.Row="1" Content="Blue"/>
        <Button Grid.Row="2">Hello</Button>
    </Grid>
</Window>"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300" Background="{DynamicResource appBackground}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <RadioButton x:Name="chooseGreenSkin" Grid.Row="0" Content="Green"/>
        <RadioButton x:Name="chooseBlueSkin" Grid.Row="1" Content="Blue"/>
        <Button Grid.Row="2">Hello</Button>
    </Grid>
</Window>

Window.xaml的后台代码

using System;
using System.Collections.ObjectModel;
using System.Windows;

namespace Chapter12
{
    /// <summary>
    /// Window1.xaml 的交互逻辑
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            EnsureSkins();
            chooseBlueSkin.Click += SkinChanged;
            chooseGreenSkin.Click+=SkinChanged;
        }

        static ResourceDictionary greenSkin;
        static ResourceDictionary blueSkin;

        void EnsureSkins()
        {
            if(greenSkin == null)
            {
                greenSkin = new ResourceDictionary();
                greenSkin.Source = new System.Uri("GreenSkin.xaml", UriKind.Relative);

                blueSkin = new ResourceDictionary();
                blueSkin.Source = new System.Uri("BlueSkin.xaml", UriKind.Relative);
            }
        }

        void SkinChanged(object o, EventArgs e)
        {
            if (chooseGreenSkin.IsChecked.Value)
            {
                ApplySkin(greenSkin);
            }
            else
            {
                ApplySkin(blueSkin);
            }
        }

        void ApplySkin(ResourceDictionary newSkin)
        {
            Collection<ResourceDictionary> appM = Application.Current.Resources.MergedDictionaries;
            if (appM.Count != 0)
            {
                appM.Remove(appM[0]);
            }
            appM.Add(newSkin);
         
        }
    }
}