在Win2d中如何从CanvasDrawingSession中的指定区域copyPixelsFromBitmap()到另一个canvasBitmap？

public void CopyPixelsFromBitmap(
    CanvasBitmap sourceBitmap,
    Rect sourceRect,
    Vector2 destPoint
)

using Microsoft.Graphics.Canvas;
using Microsoft.Graphics.Canvas.UI.Xaml;
using System;
using Windows.Foundation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace Win2DSample
{
    public sealed partial class MainPage : Page
    {
        private CanvasBitmap sourceBitmap;
        private CanvasBitmap destBitmap;

        public MainPage()
        {
            this.InitializeComponent();
        }

        private async void CanvasControl_CreateResources(CanvasControl sender, Microsoft.Graphics.Canvas.UI.CanvasCreateResourcesEventArgs args)
        {
            // 加载源位图和目标位图
            sourceBitmap = await CanvasBitmap.LoadAsync(sender, "sourceBitmap.png");
            destBitmap = new CanvasBitmap(sender, (int)sourceBitmap.Size.Width, (int)sourceBitmap.Size.Height);
        }

        private void CanvasControl_Draw(CanvasControl sender, CanvasDrawEventArgs args)
        {
            // 创建绘图会话
            using (var session = args.DrawingSession)
            {
                // 绘制源位图
                session.DrawImage(sourceBitmap);

                // 定义源区域
                Rect sourceRect = new Rect(0, 0, 100, 100);

                // 定义目标起始点
                Vector2 destPoint = new Vector2(200, 200);

                // 从源位图的指定区域复制像素到目标位图
                session.CopyPixelsFromBitmap(sourceBitmap, sourceRect, destPoint);

                // 绘制目标位图
                session.DrawImage(destBitmap);
            }
        }
    }
}