WPF位图性能(WPF Bitmap performance)

我试图理解为什么我的图像不灵活，所以我构建了一个样本来测试WPF的性能。我使用计时器来计算我的“显示图像”事件处理程序执行的时间，并使用秒表来测量图像在屏幕上显示所花费的时间。底线：当显示100,1600,2500和3600图像时，WPF 在我的代码完成显示屏幕上的图像后花了2,9,12和16秒。所以我感到无助：看起来我无法改进我的代码，使图像显得更快 - 我需要用WPF做些事情！

所以我的问题是： 为了让图像显示更快，我需要做些什么不同？

测试设置很简单：

该窗口包含一个网格。单击“测试”按钮后，将添加行和列定义。然后，按如下所示将图像添加到网格的每个单元格中：

var image = new Image(); image.BeginInit(); image.Name = ImageNameFromCell(theRow, theColumn); image.Stretch = Stretch.None; image.HorizontalAlignment = HorizontalAlignment.Center; image.VerticalAlignment = VerticalAlignment.Center; RenderOptions.SetBitmapScalingMode(image, BitmapScalingMode.LowQuality); image.EndInit(); theGrid.Children.Add(image);

最后，每个图像的源被设置为位图：已经缩小到估计的屏幕尺寸的灰度图像。位图生成如下：

var smallerBitmapImage = new BitmapImage(); smallerBitmapImage.BeginInit(); smallerBitmapImage.DecodePixelWidth = (int)(theImageWidth); smallerBitmapImage.UriSource = theUri; smallerBitmapImage.CacheOption = BitmapCacheOption.None; smallerBitmapImage.EndInit(); //BitmapFrame bitmapFrame = BitmapFrame.Create(this.FullPath); var convertedBitmap = new FormatConvertedBitmap(); convertedBitmap.BeginInit(); convertedBitmap.Source = smallerBitmapImage; convertedBitmap.DestinationFormat = PixelFormats.Gray16; convertedBitmap.EndInit(); convertedBitmap.Freeze();

所以，我在我的智慧结束。图像显着延迟，似乎超出了我的控制范围。我能做什么？

I'm trying to understand why my images are not snappy, so I built a sample to test WPF performance. I used a timer to calculate how long my "display images" event handler executed, and used a stop watch to measure how long it took the images to appear on the screen. The bottom line: when displaying 100, 1600, 2500 and 3600 images, WPF took 2, 9, 12 and 16 seconds after my code had finished to display the images on the screen. So I feel helpless: It seems I can't improve my code to make the images appear faster - I need to do something with WPF!

So my question is: What do I need to do differently to make the images display faster?

The test setup is simple:

The window contains a Grid. After the "test" button is clicked, row and column definitions are added.Then an Image is added to each cell of the grid as follows:

var image = new Image(); image.BeginInit(); image.Name = ImageNameFromCell(theRow, theColumn); image.Stretch = Stretch.None; image.HorizontalAlignment = HorizontalAlignment.Center; image.VerticalAlignment = VerticalAlignment.Center; RenderOptions.SetBitmapScalingMode(image, BitmapScalingMode.LowQuality); image.EndInit(); theGrid.Children.Add(image);

Finally, the Source of each image is set to a bitmap:a gray-scale image already scaled down to the estimated screen size. The bitmap is generated as follows:

var smallerBitmapImage = new BitmapImage(); smallerBitmapImage.BeginInit(); smallerBitmapImage.DecodePixelWidth = (int)(theImageWidth); smallerBitmapImage.UriSource = theUri; smallerBitmapImage.CacheOption = BitmapCacheOption.None; smallerBitmapImage.EndInit(); //BitmapFrame bitmapFrame = BitmapFrame.Create(this.FullPath); var convertedBitmap = new FormatConvertedBitmap(); convertedBitmap.BeginInit(); convertedBitmap.Source = smallerBitmapImage; convertedBitmap.DestinationFormat = PixelFormats.Gray16; convertedBitmap.EndInit(); convertedBitmap.Freeze();

So, I'm at my wits end. The images appear with a noticeable delay, and it seems to be out of my control. What can I do?

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