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我对我的 WPF 代码中的内存泄漏感到有点困惑。我将一些 3D 几何图形渲染到几个 RenderTargetBitmap,然后将每个渲染到一个大型的主 RenderTargetBitmap。但是当我这样做时,我得到一个内存泄漏,使我的应用程序在一两分钟后崩溃。

我在以下简化的代码中重现了该错误。

   private void timer1_Tick(object sender, EventArgs e) {
       // if first time, create final stitch bitmap and set UI image source
       if (stitch == null) {
           stitch = new RenderTargetBitmap(1280, 480, 96, 96, PixelFormats.Pbgra32);
           myImage.Source = stitch;
       }

       // create visual and render to img1
       Rect rect = new Rect(new Point(160, 100), new Size(320, 80));
       DrawingVisual dvis = new DrawingVisual();
       using (DrawingContext dc = dvis.RenderOpen()) {
           dc.DrawRectangle(System.Windows.Media.Brushes.LightBlue, (System.Windows.Media.Pen)null, rect); 
       }
       RenderTargetBitmap img1 = new RenderTargetBitmap(640, 480, 96, 96, PixelFormats.Pbgra32);
       img1.Render(dvis);

       // create visual and render to final stitch
       DrawingVisual vis = new DrawingVisual();
       using (DrawingContext dc = vis.RenderOpen()) {
           dc.DrawImage(img1, new Rect(0, 0, 640, 480));
       }

       stitch.Clear();
       stitch.Render(vis);
   }   

任何人都可以在这里看到任何明显的问题吗?为什么这段代码会有严重的内存泄漏?

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1 回答 1

1

如果你RenderTargetBitmap使用Resource Monitor 监控类的行为,你可以看到每次调用这个类,你会损失 500KB 的内存。我对您的问题的回答是:不要RenderTargetBitmap多次使用课程

你甚至不能释放 RenderTargetBitmap 的已用内存。

如果您真的需要使用RenderTargetBitmap类,只需在代码末尾添加这些行。

GC.Collect()
GC.WaitForPendingFinalizers()
GC.Collect()

这也许可以解决您的问题:

private void timer1_Tick(object sender, EventArgs e) {
       // if first time, create final stitch bitmap and set UI image source
       if (stitch == null) {
           stitch = new RenderTargetBitmap(1280, 480, 96, 96, PixelFormats.Pbgra32);
           myImage.Source = stitch;
       }

       // create visual and render to img1
       Rect rect = new Rect(new Point(160, 100), new Size(320, 80));
       DrawingVisual dvis = new DrawingVisual();
       using (DrawingContext dc = dvis.RenderOpen()) {
           dc.DrawRectangle(System.Windows.Media.Brushes.LightBlue, (System.Windows.Media.Pen)null, rect); 
       }
       RenderTargetBitmap img1 = new RenderTargetBitmap(640, 480, 96, 96, PixelFormats.Pbgra32);
       img1.Render(dvis);

       // create visual and render to final stitch
       DrawingVisual vis = new DrawingVisual();
       using (DrawingContext dc = vis.RenderOpen()) {
           dc.DrawImage(img1, new Rect(0, 0, 640, 480));
       }

        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
       stitch.Clear();
       stitch.Render(vis);
}   
于 2014-07-21T20:36:00.497 回答