How to create a Byte array that contains a real Image?

Question

Please see my code below.

I want to create a Byte array with data that I can convert into a real image. When I try to run this code I get an argumentException. What do I need to do in the For loop in order to create a legitimate Byte array that will hold data of an image? I don't want to use a real image and convert it to byte array, I want to create an image form random numbers.

    Random Rnd = new Random();

    public MainWindow()
    {
        InitializeComponent();
    }

    private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        Byte[] ByteArray = new Byte[1000];

        for (int i = 0; i < 1000; i++)
        {
            ByteArray[i] = Convert.ToByte(Rnd.Next(9));                
        }
        ImageConverter Convertor = new ImageConverter();
        BitmapImage image = (BitmapImage)Convertor.ConvertFrom(ByteArray);
        MyImage.Source = image;
    }

Notice please that I don't want to work with WinForms types or libraries like system.drawing / bitmap - I only want to use WPF technology.

Answer 1

This is the solution you are looking for, using only WPF technology.

Note that the constant value of 16 used in the stride parameter calculation comes directly from the fact that I am using a 16-bit pixel format.

    private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        Random rnd = new Random();

        Byte[] ByteArray = new Byte[(int)MyImage.Width * (int)MyImage.Height * 3];

        rnd.NextBytes(ByteArray);

        var image = BitmapSource.Create((int) MyImage.Width, (int) MyImage.Height, 72, 72,
            PixelFormats.Bgr565, null, ByteArray, (4*((int)MyImage.Width * 16 + 31)/32));

        MyImage.Source = image;
    }