在 WPF 中加载 BitmapImage 的源？
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loading the source of a BitmapImage in WPF?
提问by xarzu
In a silverlight app, I have a BitmapImage defined as System.Windows.Media.Imaging.BitmapImageand it as a method called "SetSource" where I can set the source like this:
在 Silverlight 应用程序中，我将 BitmapImage 定义为System.Windows.Media.Imaging.BitmapImage一个名为“ SetSource”的方法，我可以在其中像这样设置源：
BitmapImage bitmap = new BitmapImage();
System.IO.Stream stream = _scene.GetStream();
if (stream == null) return;
bitmap.SetSource(stream);
In a WPF application I have also have a
Bitmap image defined as System.Windows.Media.Imaging.BitmapImagebut there is no SetSource method. How do I set the source in a WPF app like I do in a Silverlight app?
在 WPF 应用程序中，我还定义了一个位图图像，System.Windows.Media.Imaging.BitmapImage但没有 SetSource 方法。如何像在 Silverlight 应用程序中那样在 WPF 应用程序中设置源？
Also, it is a stream, not a string. It is not a URI. so "UriSource" method does not work. I tried this:
此外，它是一个流，而不是一个字符串。它不是一个 URI。所以“UriSource”方法不起作用。我试过这个：
System.IO.Stream stream = _scene.GetStream();
if (stream == null) return;
BitmapImage bitmap = new BitmapImage();
bitmap.UriSource = new Uri(stream.ToString());
And at runtime, it threw an error tha URI cannot be determined. Is the URI an identifier for the intranet? Are you sure that this is not a silverlight thing? I am doing a WPF application
并且在运行时，它抛出了一个无法确定 URI 的错误。URI 是 Intranet 的标识符吗？你确定这不是银光闪闪的东西吗？我正在做一个 WPF 应用程序
回答by Clemens
You'll have to set the BitmapImage.StreamSourceproperty:
您必须设置BitmapImage.StreamSource属性：
BitmapImage bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.StreamSource = _scene.GetStream();
bitmap.EndInit();
If you want to close the stream right after creating the bitmap, you would also have to set the BitmapCacheOption.OnLoadoption:
如果您想在创建位图后立即关闭流，您还必须设置BitmapCacheOption.OnLoad选项：
using (Stream stream = _scene.GetStream())
{
bitmap.BeginInit();
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.StreamSource = stream;
bitmap.EndInit();
}
回答by Habib
You can use the constructorto specify the UriSource
BitmapImage bmp = new BitmapImage(uriSource: new Uri());
Or you can use BitmapImage.StreamSourceproperty to set the StreamSource
或者你可以使用BitmapImage.StreamSource属性来设置 StreamSource
