如何获取图像的宽度和高度
我正在尝试获取图像的高度，如下所示
BitmapImage bitmap = new BitmapImage(new Uri("Images/header.png",UriKind.RelativeOrAbsolute));
Debug.WriteLine("bitmap.PixelHeight : " + bitmap.PixelHeight);
它将高度打印为 0，但实际图像的高度为 35 像素。它不是从服务器加载的图像。它存储在应用程序包本身内部。
I am trying to get the height of an image like the following
BitmapImage bitmap = new BitmapImage(new Uri("Images/header.png",UriKind.RelativeOrAbsolute));
Debug.WriteLine("bitmap.PixelHeight : " + bitmap.PixelHeight);
It is printing the height as 0, but the actual image's height is 35 pixels. It is not an image loaded from server. It is stored inside the application bundle itself.
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您稍后会在项目中使用位图吗？如果您将其用作图像中的源，则可以尝试 Image.ActualHeight 和 Image.ActualWidth
Do you use your bitmap later in your project? If you are using it as Source in Image, you can try Image.ActualHeight and Image.ActualWidth
如果它不是从服务器加载，它仍然可能被异步加载和处理。如果您在知道图像可见后使用相同的 Debug.WriteLine 调用，是否会给出正确的结果？
If though it's not loaded from a server, it may still be loaded and processed asynchronously. If you use the same
Debug.WriteLinecall after you know the image is visible, does that give the right results?您必须等待 ImageOpened 事件才能获取宽度/高度值。这是因为从 URI 加载时会异步创建 BitmapImage（即使文件位于本地）。仅当您从流加载它时，它才会同步创建。
另一件需要注意的事情是 BitmapImage.CreateOption 默认设置为 DelayCreation，这意味着只有当 BitmapImage 分配给活动树中的元素时才会创建它。您可以设置 CreateOption = None 来更改它。
You have to wait for the ImageOpened event before you can get the Width/Heigth values. This is because the BitmapImage is being created asynchronously when loaded from a URI (even when the file is local). Only if you load it from a stream it gets created synchronously.
The other thing to be aware of is that BitmapImage.CreateOption is by default set to DelayCreation, which means it will only be created when the BitmapImage is assigned to an element in the live tree. You can set CreateOption = None to change that.