Send dynamically generated image as an attachment in email c#

Question

I'm creating an image in runtime.

Later on, this will be sent as an attachment. Here is my code-

Bitmap qr = CreateCode(false);
MailMessage mail = new MailMessage();
Attachment a = new Attachment(qr); //error

Last line shows ".... invalid arguements".

I don't want to save it locally.

Is there any way to do it?

Answer 1

Make the bitmap into a stream and then use the Attachment stream constructor:

using(var stream = new System.IO.MemoryStream())
{
    Bitmap qr = CreateCode(false);
    qr.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
    MailMessage mail = new MailMessage();
    Attachment a = new Attachment(stream,'myBitmap.bmp',MediaTypeNames.Image.Bmp);
}

the constructor params are:

public Attachment(
    Stream contentStream,
    string name,
    string mediaType
)