C#二维码生成，这里使用开源的ThoughtWorks.QRCode.dll库。

1、下载ThoughtWorks.QRCode.dll库文件，并引用到项目中。

2、创建QRCodeHandler.cs二维码处理类

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using ThoughtWorks.QRCode.Codec;using ThoughtWorks.QRCode.Codec.Data;using ThoughtWorks.QRCode.Codec.Util;namespace MyStudy.Utility{    /// <summary>    /// 二维码处理类    /// </summary>    public class QRCodeHandler    {        /// <summary>        /// 创建二维码        /// </summary>        /// <param name="QRString">二维码字符串</param>        /// <param name="QRCodeEncodeMode">二维码编码(Byte、AlphaNumeric、Numeric)</param>        /// <param name="QRCodeScale">二维码尺寸(Version为0时，1：26x26，每加1宽和高各加25</param>        /// <param name="QRCodeVersion">二维码密集度0-40</param>        /// <param name="QRCodeErrorCorrect">二维码纠错能力(L：7% M：15% Q：25% H：30%)</param>        /// <param name="filePath">保存路径</param>        /// <param name="hasLogo">是否有logo(logo尺寸50x50，QRCodeScale>=5，QRCodeErrorCorrect为H级)</param>        /// <param name="logoFilePath">logo路径</param>        /// <returns></returns>        public bool CreateQRCode(string QRString, string QRCodeEncodeMode, short QRCodeScale, int QRCodeVersion, string QRCodeErrorCorrect, string filePath, bool hasLogo, string logoFilePath)        {            bool result = true;            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();            switch (QRCodeEncodeMode)            {                case "Byte":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                    break;                case "AlphaNumeric":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;                    break;                case "Numeric":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;                    break;                default:                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                    break;            }            qrCodeEncoder.QRCodeScale = QRCodeScale;            qrCodeEncoder.QRCodeVersion = QRCodeVersion;            switch (QRCodeErrorCorrect)            {                case "L":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;                    break;                case "M":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;                    break;                case "Q":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;                    break;                case "H":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;                    break;                default:                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;                    break;            }            try            {                Image image = qrCodeEncoder.Encode(QRString, System.Text.Encoding.UTF8);                System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);                image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);                fs.Close();                if (hasLogo)                {                    Image copyImage = System.Drawing.Image.FromFile(logoFilePath);                    Graphics g = Graphics.FromImage(image);                    int x = image.Width / 2 - copyImage.Width / 2;                    int y = image.Height / 2 - copyImage.Height / 2;                    g.DrawImage(copyImage, new Rectangle(x, y, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);                    g.Dispose();                    image.Save(filePath);                    copyImage.Dispose();                }                image.Dispose();            }            catch (Exception ex)            {                result = false;            }            return result;        }    }}

3、调用方法，生成二维码

QRCodeHandler qr = new QRCodeHandler();string path = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/QRCode/";    //文件目录string qrString = "http://blog.csdn.net/pan_junbiao";                         //二维码字符串string logoFilePath = path + "myLogo.jpg";                                    //Logo路径50*50string filePath = path + "myCode.jpg";                                        //二维码文件名qr.CreateQRCode(qrString, "Byte", 5, 0, "H", filePath, true, logoFilePath);   //生成

C#二维码生成