您应该将Windows Creators Update作为目标
using Windows.UI.Xaml.Hosting;
//'this' is MainPage, but can be any UIElement
var visual = ElementCompositionPreview.GetElementVisual(this);
var brush = visual.Compositor.CreateHostBackdropBrush();
var sprite = visual.Compositor.CreateSpriteVisual();
sprite.Brush = brush;
//Set to the size of the area, update on SizeChanged
sprite.Size = new System.Numerics.Vector2(1000, 1000);
ElementCompositionPreview.SetElementChildVisual(this, sprite);
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