C# 生成读取二维码

先在Nuget中安装这个动态库

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;

namespace QRCode
{
    public class QRCodeHelper
    {

        public static string SaveFilePath = "";

        /// <summary>
        /// 生成二维码（中间不带LOGO）
        /// </summary>
        /// <param name="qrdata">要附加的内容</param>
        /// <returns></returns>
        public static void CreateQRCode(string qrdata)
        {
            try
            {
                QRCodeEncoder encoder = new QRCodeEncoder();
                encoder.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)
                encoder.QRCodeScale = 4;//大小(值越大生成的二维码图片像素越高)
                encoder.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)
                encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;//错误效验、错误更正(有4个等级)
                encoder.QRCodeBackgroundColor = Color.White;
                encoder.QRCodeForegroundColor = Color.Black;
                Image image = encoder.Encode(qrdata, Encoding.UTF8);
                image.Save(SaveFilePath, ImageFormat.Png);
                image.Dispose();

            }
            catch (Exception e)
            {
                //一些操作
            }
        }

        /// <summary>
        /// 生成二维码（中间带LOGO）
        /// </summary>
        /// <param name="qrdata">要附加的内容</param>
        ///<param name="AbsoluteLogo">保存的绝对路径</param>
        /// <returns></returns>
        public static void CreateQRCode(string qrdata, string AbsoluteLogo)
        {
            try
            {
                QRCodeEncoder encoder = new QRCodeEncoder();
                encoder.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)
                encoder.QRCodeScale = 4;//大小(值越大生成的二维码图片像素越高)
                encoder.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)
                encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;//错误效验、错误更正(有4个等级)
                encoder.QRCodeBackgroundColor = Color.White;
                encoder.QRCodeForegroundColor = Color.Black;
                Image image = encoder.Encode(qrdata, Encoding.UTF8);
                Bitmap btm = new Bitmap(AbsoluteLogo);
                Bitmap copyImage = new Bitmap(btm, image.Width / 5, image.Height / 5);
                Graphics g = Graphics.FromImage(image);
                int x = image.Width / 2 - copyImage.Width / 2;
                int y = image.Height / 2 - copyImage.Height / 2;
                g.DrawImage(copyImage, x, y);
                image.Save(SaveFilePath, ImageFormat.Png);
                image.Dispose();
                btm.Dispose();
                copyImage.Dispose();
                g.Dispose();
            }
            catch (Exception e)
            {
                //一些操作
            }
        }

        /// <summary>
        /// 解析二维码
        /// </summary>
        /// <param name="absoluteSave">二维码的绝对路径</param>
        /// <returns></returns>
        public static string DeCode(string AbsoluteQRCodePath)
        {
            string decodedString = new QRCodeDecoder().decode(new QRCodeBitmapImage(new Bitmap(AbsoluteQRCodePath)), Encoding.UTF8);
            return decodedString;
        }
    }
}

        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void simpleButton1_Click(object sender, EventArgs e)
        {
            #region 调用QRCode创建二维码
            string fileN = Environment.CurrentDirectory + "\Img\123_New.png";
            if (File.Exists(fileN))
            {
                File.Delete(fileN);
            }
            QRCodeHelper.SaveFilePath = fileN;
            QRCodeHelper.CreateQRCode(this.textEdit1.Text.Trim());
            this.pictureEdit1.Image = Image.FromFile(fileN);
            #endregion
        }
        /// <summary>
        /// 读取二维码
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void simpleButton2_Click(object sender, EventArgs e)
        {
            string str = QRCodeHelper.DeCode(Environment.CurrentDirectory + "\Img\璇狼之风QRCODE.png");

            this.Text = "当前二维码内容：" + str;
        }

        /// <summary>
        /// 带Logo的QR
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void simpleButton3_Click(object sender, EventArgs e)
        {
            #region 调用QRCode创建二维码 带Logo

            string fileN = Environment.CurrentDirectory + "\Img\璇狼之风QRCODE.png";

            if (File.Exists(fileN))
            {
                File.Delete(fileN);
            }

            string filePic = Environment.CurrentDirectory + "\Img\璇狼之风.jpg";

            QRCodeHelper.SaveFilePath = fileN;

            QRCodeHelper.CreateQRCode(this.textEdit1.Text.Trim(), filePic);

            System.Drawing.Image img = System.Drawing.Image.FromFile(fileN);

            System.Drawing.Image bmp = new System.Drawing.Bitmap(img);

            this.pictureEdit1.Image = bmp;

            img.Dispose();

            #endregion
        }