c# - 来自嵌入图像的 BitmapSource

Question

我的目标是在 WPF 窗口上重写 OnRender 方法中绘制图像“someImage.png”，它是嵌入资源:

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

我找到了将图像从资源获取到 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    

}

但是我现在如何获取或创建 BitmapSource？

Answer 1

您可以通过设置其 StreamSource 属性从流创建 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;    
}

<小时/>

也就是说，您通常会从Resource File Pack URI创建一个BitmapImage。 ，例如

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