using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
using System.Windows.Media.Imaging;

namespace _29WxOrderWpf.Converters
{
    public class ImageUrlToBitmapImageConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is string url && Uri.IsWellFormedUriString(url, UriKind.Absolute))
            {
                return new BitmapImage(new Uri(url));
                //return Task.Run(() => new BitmapImage(new Uri(url))); // 使用 Task.Run 来异步加载图片。
            }
            return null;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException(); // 不需要反向转换，所以不实现。
        }
    }
}