WPF：如何将任何东西保存为图像vb.net [英] WPF: How to save any thing as image vb.net

问题描述

如何将具有TRANSPARENT背景的任何控件保存为图像（例如： Inkcanvas 或网格控件）控件的背景是透明的？我可以在WinForms应用程序中执行此操作，但我不知道它是否在WPF中是可能的。

____________________________________________________________________________：D :)

How can I save any control as Image (ex: Inkcanvas or Grid control) with a TRANSPARENT background if the control''s background was Transparent? I can do it in WinForms Application and I don''t know if it is Possible in WPF.
____________________________________________________________________________:D :)

<Thanks To="All" Regards="Best"></Thanks>

推荐答案

让我们从最后开始：透明度不会成为问题，因为PNG位图支持透明度： http://en.wikipedia.org/wiki/Portable_Network_Graphics [ ^ ]。



用于渲染像位图上的控件（实际上你可以渲染任何 Visual 因此任何控制;请看下面），你需要使用类 System.Windows.Media.DrawingVisual 和 System.Windows.Media.Imaging.RenderTargetBitmap ：

http：// msdn .microsoft.com / zh-cn / library / system.windows.media.drawingvisual.aspx [ ^ ]，

http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.rendertargetbitmap.aspx [< a href =http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.rendertargetbitmap.aspxtarget =_ blanktitle =New Window> ^ ] 。



如果您查看上面引用的 DrawingVisual 类的MSDN帮助页面，您将看到用于创建bitma的代码示例p来自 System.Windows.Media.Visual ，但对于 Visual 类系统使用.Windows.Media.DrawingVisual ，这是你不需要的。该怎么办？一样; DrawingVisual 仅被视为简化示例，但您需要使用其他内容。



请查看一个 Visual 类： http://msdn.microsoft.com/en-us/library/system.windows.media.visual.aspx [ ^ ]。



你可以看到这个类是 System.Windows.UIElement 的基类，因此，你感兴趣的任何东西。这解决了你的问题。

-SA

Lets start from the very end: transparency won''t be a problem, because PNG bitmaps support transparency: http://en.wikipedia.org/wiki/Portable_Network_Graphics[^].

For rendering of something like a control on a bitmap (you actually can render any Visual and hence any control; please see below), you need to use the classes System.Windows.Media.DrawingVisual and System.Windows.Media.Imaging.RenderTargetBitmap:
http://msdn.microsoft.com/en-us/library/system.windows.media.drawingvisual.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.rendertargetbitmap.aspx[^].

If you look at the MSDN help page for the class DrawingVisual, referenced above, you will see a code sample for creating a bitmap from a System.Windows.Media.Visual, but for the Visual the class System.Windows.Media.DrawingVisual is used, which you don''t need. What to do? Same thing; DrawingVisual is considered only to make the example short, but you will need to use something else.

Please look a the Visual class: http://msdn.microsoft.com/en-us/library/system.windows.media.visual.aspx[^].

You can see that this class is a base class for System.Windows.UIElement, and, hence, anything you are interested in. That solves your problem.

—SA

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