HttpContext context = HttpContext.Current;            String data = "二维码的内容";//如果是链接会跳转            if (!string.IsNullOrEmpty(data))            {                QRCodeEncoder encoder = new QRCodeEncoder();                Bitmap imgBack = encoder.Encode(data, System.Text.Encoding.UTF8);                Image logoImg = Image.FromFile(context.Server.MapPath("~/images/1.png"));                System.Drawing.Image bitmap = new System.Drawing.Bitmap(280, 280);                System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);                g.DrawImage(imgBack, 0, 0, 280, 280);                g.DrawImage(logoImg, 140 - 40, 140 - 40, 80, 80);                bitmap.Save(context.Server.MapPath("~/images/2.png"));            }