Download server memory image

Question

I have an Asp.Net MVC project where I have an image in memory and would like to download it.

See an excerpt from the code:

Image imagem = default(Image);

using (Bitmap b = new Bitmap(bitmapWidth, bitmapHeight))
{
    using (Graphics g = Graphics.FromImage(b))
    {
        g.Clear(Color.Red);

        var font = new Font("Arial", 50, FontStyle.Bold);
        g.DrawString("Stackoverflow", font, Brushes.White, posicaoX, posicaoY);
    }

    using (MemoryStream stream = new MemoryStream())
    {
        b.Save(stream, ImageFormat.Jpeg);
        imagem = Image.FromStream(stream);
    }
}

using (System.Net.WebClient client = new System.Net.WebClient())
{
    client.DownloadFile(imagem); // Não sei bem como posso fazer o Download.
}

Answer 1

In his Controller, create a Action thus:

    public FileResult Imagem()
    {
        /* Carregue o stream antes. */
        return File(stream, "image/jpeg");
    }

Or even, adapting its logic:

public FileResult Imagem()
{
    Image imagem = default(Image);

    using (Bitmap b = new Bitmap(bitmapWidth, bitmapHeight))
    {
        using (Graphics g = Graphics.FromImage(b))
        {
            g.Clear(Color.Red);

            var font = new Font("Arial", 50, FontStyle.Bold);
            g.DrawString("Stackoverflow", font, Brushes.White, posicaoX, posicaoY);
        }

        using (MemoryStream stream = new MemoryStream())
        {
            b.Save(stream, ImageFormat.Jpeg);
            imagem = Image.FromStream(stream);
            return File(stream.ToArray(), "image/jpeg");
        }   
    }
}

---

EDIT

I don’t know what’s closing the stream, according to your comment, but I would try to carry another stream to return, like this:

using (var ms = new MemoryStream())
{
    imagem.Save(ms,ImageFormat.Jpeg);
    return File(ms.ToArray(), "image/jpeg");
}