using System;
using System.Drawing;
using System.Net;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        private Image[] _images;
        private readonly PictureBox _pictureBox;
        public Form1()
        {
            InitializeComponent();
            LoadImages();
            _pictureBox = new PictureBox()
            {
                Dock = DockStyle.Fill,
            };
            this.Controls.Add(_pictureBox);

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            StartSimpleAnimation();
        }

        private void StartSimpleAnimation()
        {
            int i = 0;
            Task.Run(new Action(async () =>
            {
                while (true)
                {
                    if (++i >= _images.Length) i = 0;
                    Invoke(new Action(() => { _pictureBox.Image = _images[i]; }));
                    await Task.Delay(100);
                }
            }));
        }

        private void LoadImages()
        {
            _images = new Image[73];
            for (var i = 0; i < 73; i++)
            {
                var image = GetBitmapFromUri($"https://im3.ezgif.com/tmp/ezgif-3-2d634e36e5-gif-png/frame_{i:00}_delay-0.08s.png");
                _images[i] = image;
            }
        }

        private Image GetBitmapFromUri(string url)
        {
            var uri = new Uri(url);
            using (var wc = new WebClient())
            {
                using (var stream = wc.OpenRead(uri))
                {
                    return Image.FromStream(stream);
                }
            }
        }
    }
}