C# 二维码 ThoughtWorks.QRCode.dll

原文出处：https://www.cnblogs.com/cang12138/p/5209669.html (已做有补充）

ThoughtWorks.QRCode.dll：

1、ThoughtWorks.QRCode.dll

2、通过 NuGet 添加

后台代码：

using System;
using System.Drawing;
using System.Text;
using ThoughtWorks.QRCode.Codec;

namespace ConsoleTest
{
    public class Test
    {
        #region 生成二维码
        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="number"></param>
        /// <returns></returns>
        private static string QRCode()
        {
            System.Drawing.Bitmap bt;
            string enCodeString = "http://www.baidu.com";

            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 = 4;//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.Yellow;//背景色
            qrCodeEncoder.QRCodeForegroundColor = Color.Green;//前景色

            bt = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);

            string filename = "code";
            string file_path = AppDomain.CurrentDomain.BaseDirectory + "QRCode\\";
            string codeUrl = file_path + 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 codeUrl;
        }
        #endregion
    }
}

二维码效果：

C# 二维码 ThoughtWorks.QRCode.dll

补充：
将二维码转换成网页可以显示的数据

        /// <summary>
        /// 将二维码转换成网页可以显示的数据
        /// </summary>
        /// <param name="qrcode"></param>
        /// <returns></returns>
        public static string GetQrcodeImageData(string qrcode)
        {
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeScale = 12;
            qrCodeEncoder.QRCodeVersion = 2;
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
      
            var bmp = qrCodeEncoder.Encode(qrcode);

            byte[] b = null;
            using (MemoryStream stream = new MemoryStream())
            {
                bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);//将图像以指定的格式存入缓存内存流
                b = new byte[stream.Length];
                stream.Position = 0;
                stream.Read(b, 0, Convert.ToInt32(b.Length));
            }
            return "data:image/jpeg;base64," + Convert.ToBase64String(b);
        }

C# 二维码 ThoughtWorks.QRCode.dll

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