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C#生成二维码

public string QrCode(string content)
        {
            string enCodeString = content;//获取到需要转化为二维码的字符
            try
            {
                QRCodeEncoder codeEncoder = new QRCodeEncoder();//创建一个编码器
                codeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
                codeEncoder.QRCodeScale = 4;
                codeEncoder.QRCodeVersion = 0;
                codeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
                Bitmap pic = codeEncoder.Encode(content, System.Text.Encoding.UTF8);
 
                string filename = DateTime.Now.ToString("yyyymmddhhmmssfff").ToString() + ".jpg";
                string filepath = Server.MapPath(@"\Upload") + "\\" + filename;
                System.IO.FileStream fs = new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
                pic.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
                fs.Close();
                pic.Dispose();
                return filename;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }