来自嵌入式图像的BitmapSource

Question

我的目标是在WPF窗口上绘制图像"someImage.png",它是嵌入式资源,在重写的OnRender方法中:

protected override void OnRender(System.Windows.Media.DrawingContext drawingContext)
{
    base.OnRender(drawingContext);            
    drawingContext.DrawImage(ImageSource, Rect);            
}

我找到了将我的图像从资源转换为Stream的代码:

public BitmapSource GetSourceForOnRender()
{
    System.Reflection.Assembly myAssembly = System.Reflection.Assembly.GetExecutingAssembly();
    Stream myStream = myAssembly.GetManifestResourceStream("KisserConsole.someImage.png");

    // What to do now?

    return //BitmapSource    

}

但是我现在如何获得或创建BitmapSource？

Answer 1

您可以通过设置其StreamSource属性从流中创建BitmapImage :

public BitmapSource GetSourceForOnRender()
{
    var assembly = System.Reflection.Assembly.GetExecutingAssembly();
    var bitmap = new BitmapImage();

    using (var stream =
        assembly.GetManifestResourceStream("KisserConsole.someImage.png"))
    {
        bitmap.BeginInit();
        bitmap.StreamSource = stream;
        bitmap.CacheOption = BitmapCacheOption.OnLoad;
        bitmap.EndInit();
    }

    return bitmap;    
}

也就是说,您通常会从资源文件包URI创建一个BitmapImage ,例如

new BitmapImage(new Uri(
    "pack://application:,,,/KisserConsole.someImage.png"));