WPF 使用 WinForm 播放 gif

GifImageControl.cs

    /// <summary>
    /// 使用 WinForm 播放 Gif 
    /// </summary>
    /// <example>
    /// xaml:
    /// <local:GifImageControl x:Name="Image" Path="lindexi.gif"></local:GifImageControl>
    /// cs:
    /// var image = new GifImageControl("E:\\lindexi.gif");
    /// Grid.Children.Add(image);
    /// </example>
    public class GifImageControl : Image
    {
        /// <inheritdoc />
        public GifImageControl()
        {
        }

        /// <inheritdoc />
        public GifImageControl(string path)
        {
            Path = path;
        }

        /// <summary>
        ///     图片的地址
        /// </summary>
        public string Path
        {
            get => _path;
            set
            {
                if (!File.Exists(value))
                {
                    var file = new FileInfo(value);
                    if (!file.Exists)
                    {
                        throw new ArgumentException("找不到文件" + value);
                    }

                    value = file.FullName;
                }

                _path = value;
                Start();
            }
        }

        /// <summary>
        ///     播放图片
        /// </summary>
        public void Start()
        {
            if (_bitmap != null)
            {
                //多次点击播放，如果没有停止，会让上一个图片还在播放
                Stop();
            }

            var path = Path;
            _bitmap = (Bitmap) System.Drawing.Image.FromFile(path);
            ImageAnimator.Animate(_bitmap, OnFrameChanged);
            _bitmapSource = GetBitmapSource();
            Source = _bitmapSource;
        }

        /// <summary>
        ///     停止播放
        /// </summary>
        public void Stop()
        {
            if (_bitmap == null)
            {
                return;
            }

            ImageAnimator.StopAnimate(_bitmap, OnFrameChanged);
            _bitmap.Dispose();
            _bitmap = null;
        }

        private Bitmap _bitmap;

        private BitmapSource _bitmapSource;
        private string _path;


        private void OnFrameChanged(object sender, EventArgs e)
        {
            Dispatcher.InvokeAsync(OnFrameChangedInMainThread);
        }

        private void OnFrameChangedInMainThread()
        {
            ImageAnimator.UpdateFrames();

            _bitmapSource = GetBitmapSource();
            Source = _bitmapSource;
            InvalidateVisual();
        }

        private BitmapSource GetBitmapSource()
        {
            IntPtr inptr = _bitmap.GetHbitmap();
            _bitmapSource = Imaging.CreateBitmapSourceFromHBitmap(
                inptr, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
            DeleteObject(inptr);
            return _bitmapSource;
        }

        [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool DeleteObject(IntPtr hObject);
    }