如何通过url从本地服务器下载图像并保存为uwp中的字节数组

using System.Net.Http;
using System.Threading.Tasks;

private async Task<byte[]> DownloadImageAsync(string imageUrl)
{
    using (HttpClient client = new HttpClient())
    {
        try
        {
            HttpResponseMessage response = await client.GetAsync(imageUrl);
            response.EnsureSuccessStatusCode(); // 确保响应成功
            return await response.Content.ReadAsByteArrayAsync(); // 读取内容为字节数组
        }
        catch (HttpRequestException e)
        {
            // 处理HTTP请求异常
            Console.WriteLine($"Request error: {e.Message}");
            return null;
        }
    }
}

private async void DownloadAndDisplayImage(string imageUrl)
{
    byte[] imageBytes = await DownloadImageAsync(imageUrl);
    if (imageBytes != null)
    {
        // 在这里处理字节数组，例如将其转换为BitmapImage并显示在XAML中的Image控件
        using (InMemoryRandomAccessStream ms = new InMemoryRandomAccessStream())
        {
            await ms.WriteAsync(imageBytes.AsBuffer());
            ms.Seek(0);

            BitmapImage bitmapImage = new BitmapImage();
            await bitmapImage.SetSourceAsync(ms);

            // 假设你有一个名为imageControl的XAML Image控件
            imageControl.Source = bitmapImage;
        }
    }
    else
    {
        // 处理下载失败的情况
        MessageBox.Show("图像下载失败。");
    }
}

// 假设你有一个按钮点击事件处理程序
private async void Button_Click(object sender, RoutedEventArgs e)
{
    string imageUrl = "http://yourserver.com/path/to/image.jpg";
    await DownloadAndDisplayImage(imageUrl);
}