在WindowsFormsHost上使用RenderTargetBitmap [英] Using RenderTargetBitmap on WindowsFormsHost

问题描述

我在 WindowsFormsHost 内有一组控件，我想捕获当前视图并将其保存为图像，但是我只得到了一些面板在图像中可见。

是否可以将WindowsFormsHost用作可视并捕获包装的控件？ / p>

请参阅我的示例：

 < WindowsFormsHost x：Name = windowHost> 
< wf：Panel Dock =填充 x：Name = basePanel /> 
< / WindowsFormsHost> 
  

如果我要向 basePanel添加按钮或其他内容使用以下代码导出到PNG时将不可见：

  RenderTargetBitmap rtb = new RenderTargetBitmap（ basePanel.Width，
 basePanel.Height，96，96，PixelFormats.Pbgra32）; 
 rtb.Render（windowHost）; 
 
 PngBitmapEncoder pnge =新的PngBitmapEncoder（）; 
 pnge.Frames.Add（BitmapFrame.Create（rtb））; 
流stream = File.Create（ test.jpg）; 
 
 pnge.Save（stream）; 
 
 stream.Close（）; 
  

关于为什么这可能不起作用以及可能的解决方法的建议？我想这并不是真的应该以这种方式工作，但确实可以希望！

解决方案

Windows窗体控件也知道如何渲染自身，则不必跳过屏幕捕捉框。使其看起来像这样：

 使用（var bmp = new System.Drawing.Bitmap（basePanel.Width，basePanel.Height） ）{
 basePanel.DrawToBitmap（bmp，new System.Drawing.Rectangle（0，0，bmp.Width，bmp.Height））; 
 bmp.Save（@ c：\temp\test.png）; 
} 
  

I have a set of controls inside a WindowsFormsHost and I would like to capture the current view and just save it as an image, I however only get some Panel visible in the Image.

Is it possible to use the WindowsFormsHost as a "Visual" and capture the wrapped controls?

See my example:

<WindowsFormsHost x:Name="windowHost">
    <wf:Panel Dock="Fill" x:Name="basePanel"/>
</WindowsFormsHost>

If i were to add a Button or whatever to the basePanel this wouldn't be visible when exporting to a PNG with the following code:

 RenderTargetBitmap rtb = new RenderTargetBitmap(basePanel.Width, 
                                 basePanel.Height, 96, 96, PixelFormats.Pbgra32);
 rtb.Render(windowHost);

 PngBitmapEncoder pnge = new PngBitmapEncoder();
 pnge.Frames.Add(BitmapFrame.Create(rtb));
 Stream stream = File.Create("test.jpg");

 pnge.Save(stream);

 stream.Close();

Suggestions on why this might not work and maybe a possible work-around? I guess it's not really suppose to work this way, but one could really hope!

解决方案

A Windows Forms control also knows how to render itself, you don't have to jump through the screen capture hoop. Make it look like this:

    using (var bmp = new System.Drawing.Bitmap(basePanel.Width, basePanel.Height)) {
        basePanel.DrawToBitmap(bmp, new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height));
        bmp.Save(@"c:\temp\test.png");
    }

这篇关于在WindowsFormsHost上使用RenderTargetBitmap的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！