C#生成二维码

 public Bitmap NewCode(string str)
        {
            //初始化二维码生成工具
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            qrCodeEncoder.QRCodeVersion = 0;
            qrCodeEncoder.QRCodeScale = 4;

            //将字符串生成二维码图片
            Bitmap image = qrCodeEncoder.Encode(str, Encoding.Default);
            return image;
        }

 public ActionResult Cre()
        {
         
            Bitmap image = createcode.NewCode(content);

            MemoryStream ms = new MemoryStream();
            image.Save(ms, ImageFormat.Png);
            Response.BinaryWrite(ms.GetBuffer());
            return null;
        }

<img src="@Url.Action("Cre")" />