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



public static class WriteableBitmapExtensions
{
    /// <summary>
    /// Convert the WriteableBitmap to GDI+ Bitmap.
    /// </summary>
    /// <param name="bitmapsource">The writeable bitmap.</param>
    /// <returns>returns a System.Drawing.Bitmap Bitmap.</returns>
    public static System.Drawing.Bitmap ConvertToGDIBitmap(this WriteableBitmap bitmapsource)
    {
        using (MemoryStream stream = new MemoryStream())
        {
            BitmapEncoder enc = new BmpBitmapEncoder();
            enc.Frames.Add(BitmapFrame.Create(bitmapsource));
            enc.Save(stream);

            using (var tempBitmap = new System.Drawing.Bitmap(stream))
            {
                // According to MSDN, one "must keep the stream open for the lifetime of the Bitmap."
                // So we return a copy of the new bitmap, allowing us to dispose both the bitmap and the stream.
                var result = new System.Drawing.Bitmap(tempBitmap);
                stream.Dispose();
                return result;
            }
        }
    }


    /// <summary>
    /// Convert the WriteableBitmap to BitmapImage.
    /// </summary>
    /// <param name="bitmapSource">The writeable bitmap.</param>
    /// <returns>returns a new instance of BitmapImage</returns>
    public static BitmapImage ConvertToBitmapImage(this WriteableBitmap bitmapSource)
    {
        JpegBitmapEncoder encoder = new JpegBitmapEncoder();
        MemoryStream memoryStream = new MemoryStream();
        BitmapImage bImg = new BitmapImage();

        encoder.Frames.Add(BitmapFrame.Create(bitmapSource));
        encoder.Save(memoryStream);

        bImg.BeginInit();
        bImg.StreamSource = new MemoryStream(memoryStream.ToArray());
        bImg.EndInit();

        memoryStream.Close();

        return bImg;
    }
}