Quickest way to compare two BitmapImages to check if they are different in WPF

Question

What\'s the quickest way to compare 2 BitmapImage objects. One is in the Image Source property, and another I create in code.

I can set the image source with the new

Answer 1

You could compare the bytes of the BitmapImage to check if they are equal

Something like:

public static class BitmapImageExtensions
{
    public static bool IsEqual(this BitmapImage image1, BitmapImage image2)
    {
        if (image1 == null || image2 == null)
        {
            return false;
        }
        return image1.ToBytes().SequenceEqual(image2.ToBytes());
    }

    public static byte[] ToBytes(this BitmapImage image)
    {
        byte[] data = new byte[] { };
        if (image != null)
        {
            try
            {
                var encoder = new BmpBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create(image));
                using (MemoryStream ms = new MemoryStream())
                {
                    encoder.Save(ms);
                    data = ms.ToArray();
                }
                return data;
            }
            catch (Exception ex)
            {
            }
        }
        return data;
    }
}

Usage:

BitmapImage image1 = ..............
BitmapImage image2 = ................

if (image1.IsEqual(image2))
{
    // same image
}