SixLabors.ImageSharp extensions: convert Image<TPixel> to byte array and System.Drawing.Bitmap etc.

ImageSharpExtensions.cs

namespace Vurdalakov
{
    using System;
    using System.IO;

    using SixLabors.ImageSharp;
    using SixLabors.ImageSharp.Advanced;
    using SixLabors.ImageSharp.Formats;
    using SixLabors.ImageSharp.Formats.Png;
    using SixLabors.ImageSharp.PixelFormats;

    public static class ImageSharpExtensions
    {
        public static Byte[] ToArray<TPixel>(this Image<TPixel> image, IImageFormat imageFormat) where TPixel : unmanaged, IPixel<TPixel>
        {
            using (var memoryStream = new MemoryStream())
            {
                var imageEncoder = image.GetConfiguration().ImageFormatsManager.FindEncoder(imageFormat);
                image.Save(memoryStream, imageEncoder);
                return memoryStream.ToArray();
            }
        }

        public static System.Drawing.Bitmap ToBitmap<TPixel>(this Image<TPixel> image) where TPixel : unmanaged, IPixel<TPixel>
        {
            using (var memoryStream = new MemoryStream())
            {
                var imageEncoder = image.GetConfiguration().ImageFormatsManager.FindEncoder(PngFormat.Instance);
                image.Save(memoryStream, imageEncoder);

                memoryStream.Seek(0, SeekOrigin.Begin);

                return new System.Drawing.Bitmap(memoryStream);
            }
        }

        public static Image<TPixel> ToImageSharpImage<TPixel>(this System.Drawing.Bitmap bitmap) where TPixel : unmanaged, IPixel<TPixel>
        {
            using (var memoryStream = new MemoryStream())
            {
                bitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png);

                memoryStream.Seek(0, SeekOrigin.Begin);

                return Image.Load<TPixel>(memoryStream);
            }
        }
    }
}

I agree with @snechaev - disposing of the stream causes an exception when converting from ImageSharp to System.Drawing.Bitmap. I use the following:

    public static Bitmap ImageSharpToBitmap(this SixLabors.ImageSharp.Image img)
    {
        if (img == null) return new Bitmap(0, 0);
        var stream = new MemoryStream();
        img.Save(stream, BmpFormat.Instance);
        stream.Position = 0;
        return  new Bitmap(stream);
    }