C#生成二维码

1、安装ThoughtWorks.QRCode包

2、引入

using ThoughtWorks.QRCode.Codec;

3、具体代码

        public string DrawQRCode(string enCodeString, string width, string height)
        {
            string downPath = string.Empty;
            System.Drawing.Bitmap bt;
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式(注意：BYTE能支持中文，ALPHA_NUMERIC扫描出来的都是数字)
            qrCodeEncoder.QRCodeScale = 10;//大小(值越大生成的二维码图片像素越高)
            qrCodeEncoder.QRCodeVersion = 0;//版本(注意：设置为0主要是防止编码的字符串太长时发生错误)
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误效验、错误更正(有4个等级)
            qrCodeEncoder.QRCodeBackgroundColor = Color.White;//背景色
            qrCodeEncoder.QRCodeForegroundColor = Color.Black;//前景色
            bt = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);
            string filename = enCodeString;// "code";
            string file_path = filePath.Substring(filePath.LastIndexOf("\"));
            string codeUrl = filePath + "/" + filename + ".jpg";

            downLoadPath = downLoadPath.Substring(downLoadPath.LastIndexOf("/"));
            downPath = downLoadPath + "/" + filename + ".jpg";

            //根据文件名称，自动建立对应目录
            if (!System.IO.Directory.Exists(file_path))
            {
                System.IO.Directory.CreateDirectory(file_path);
            }

            bt.Save(codeUrl);//保存图片
            return downPath;
        }