在Xamarin表单中无法通过URL加载图像

using System;
using System.Net.Http;
using Xamarin.Forms;
using SkiaSharp;
using SkiaSharp.Views.Forms;
using Xamarin.Essentials;

public class ImagePage : ContentPage
{
    public ImagePage()
    {
        var image = new SKBitmap();

        var loadImageButton = new Button
        {
            Text = "Load Image",
            Command = new Command(async () =>
            {
                var url = "https://example.com/image.jpg"; // 替换为你要加载的图像的URL

                using (var client = new HttpClient())
                {
                    var imageBytes = await client.GetByteArrayAsync(url);
                    image = SKBitmap.Decode(imageBytes);

                    // 更新图像控件
                    imageControl.InvalidateSurface();
                }
            })
        };

        var imageControl = new SKCanvasView();
        imageControl.PaintSurface += (sender, e) =>
        {
            var canvas = e.Surface.Canvas;
            canvas.Clear();

            if (image != null)
            {
                canvas.DrawBitmap(image, new SKRect(0, 0, image.Width, image.Height));
            }
        };

        Content = new StackLayout
        {
            Children = { loadImageButton, imageControl }
        };
    }
}