WPF 用代码调用dynamic resource动态更改背景

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一般dynamic resoource通常在XAML里调用，如下范例：

如果在ResourceDictionary定义了很多不同的背景，比如：

<VisualBrush x:Key="Theme1">    <VisualBrush.Visual>        <Viewbox Width="1920" Height="1080">            <Canvas x:Name="PART_Canvas" Width="1920" Height="1080">                                   <Path Data="F1 M 1920.000,1079.906 L 0.000,1080.000 L 0.000,0.094 L 1920.000,0.000 L 1920.000,1079.906 Z">                        <Path.Fill>                            <LinearGradientBrush MappingMode="Absolute" StartPoint="959.917,-1324.218" EndPoint="959.916,-55.456">                                <LinearGradientBrush.GradientStops>                                    <GradientStop Offset="0.00" Color="#ff5090cd"/>                                    <GradientStop Offset="0.66" Color="#ff5090cd"/>                                    <GradientStop Offset="0.76" Color="#ff5090cd"/>                                    <GradientStop Offset="0.95" Color="#ff287bbf"/>                                    <GradientStop Offset="1.00" Color="#ff0067b1"/>                                </LinearGradientBrush.GradientStops>                                <LinearGradientBrush.Transform>                                    <MatrixTransform Matrix="1.000,0.000,-0.000,-1.000,0.084,0.631" />                                </LinearGradientBrush.Transform>                            </LinearGradientBrush>                        </Path.Fill>                    </Path>

</Canvas></ViewBox></VisualBrush.Visual></VisualBrush>

就可以在codebehind里，用如下方式动态选择不同的背景：

this.btn.SetResourceReference(BackgroundProperty, "Theme1");

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