WPF如何将Canvas中的内容打印出来?

[longjun1627]

[code=XAML]
<Canvas x:Name="ImageCanvas" Height="480" Width="640" >
<Image Width="150" Height="230" Canvas.Left="0" Canvas.Top="0"
Source="1.jpg"/>
<Image Width="240" Height="280" Canvas.Left="30" Canvas.Top="50"
Source="2.jpg" x:Name="BottomImage" AllowDrop="false"/>
</Canvas>
<Button x:Name="PrintBtn" Content="打印" />
<Button x:Name="PrintViewBtn" Content="打印预览" />
<Button x:Name="SaveBtn" Content="保存" />
[/code]

我要打印/打印预览/保存如上所示的一个Canvas,其中Canvas会有背景图,打印/打印预览/保存时能把Canvas的背景图以及二个IMAGE(1.JPG,2.JPG)都能打印/打印预览/保存出来[保存成一张图片]
要实现这样的功能如何做呀?各位给点提示或建议呀,多谢了
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