annotations/Azaion.Annotator/DTO/ThumbnailDto.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Media.Imaging;

namespace Azaion.Annotator.DTO;

public class ThumbnailDto : INotifyPropertyChanged
{
    public string ThumbnailPath { get; set; }
    public string ImagePath { get; set; }
    public string LabelPath { get; set; }

    private BitmapImage? _image;
    public BitmapImage? Image
    {
        get
        {
            if (_image == null)
                LoadImageAsync();
            return _image;
        }
        set
        {
            _image = value;
            OnPropertyChanged();
        }
    }

    private async void LoadImageAsync()
    {
        await Task.Run(() =>
        {
            try
            {
                var bitmap = new BitmapImage();
                bitmap.BeginInit();
                bitmap.UriSource = new Uri(ThumbnailPath);
                bitmap.CacheOption = BitmapCacheOption.OnLoad;
                bitmap.DecodePixelWidth = 480;
                bitmap.DecodePixelHeight = 270;
                bitmap.EndInit();
                bitmap.Freeze(); // Freeze to make it cross-thread accessible
                Image = bitmap;
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        });
    }

    public event PropertyChangedEventHandler? PropertyChanged;
    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}