StTest/MyTests/ImagesManip.cs

using Microsoft.Win32;
using System;
using System.IO;
using System.Windows.Media.Imaging;

namespace MyTests
{
    internal class ImagesManip
    {
        public static byte[] BitmapSourceToByteArray(BitmapSource image)
        {
            #region Кодирование картинки
            using (var stream = new MemoryStream())
            {
                var encoder = new PngBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create(image));
                encoder.Save(stream);
                return stream.ToArray();
            }
            #endregion
        }

        public static BitmapImage SelectImage()
        {
            #region Выбор картинки
            OpenFileDialog op = new OpenFileDialog
            {
                Title = "Выбрать изображение",
                Filter = "All supported graphics|*.jpg;*.jpeg;*.png|" +
                        "JPEG (*.jpg;*.jpeg)|*.jpg;*.jpeg|" +
                        "Portable Network Graphic (*.png)|*.png"
            };
            if (op.ShowDialog() == true)
                return new BitmapImage(new Uri(op.FileName));
            else
                return null;
            #endregion
        }

        public static BitmapImage NewImage(Users user)
        {
            try
            {
                MemoryStream ms = new MemoryStream(user.Image);
                BitmapImage image = new BitmapImage();
                image.BeginInit();
                image.StreamSource = ms;
                image.EndInit();
                return image;
            }
            catch
            {
                return new BitmapImage(new Uri("../Resources/StandartImage.png", UriKind.RelativeOrAbsolute));
            }
            
        }
    }
}