实例教您C#如何生成二维码?-附源码

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.woaidaogu.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
    }
}

protected void Button1_Click(object sender, EventArgs e)
    {
      using (var ms = new MemoryStream())
      {
        string stringtest = "http://www.woaidaogu.com/";
        GetQRCode(stringtest, ms);
        Response.ContentType = "image/Png";
        Response.OutputStream.Write(ms.GetBuffer(), 0, (int)ms.Length);
        Image img = Image.FromStream(ms);
        string filename = DateTime.Now.ToString("yyyymmddhhmmss");
        string path = Server.MapPath("~/image/") + filename + ".png";
        img.Save(path);
        Response.End();
      } 
    }
    /// <summary>
    /// 获取二维码
    /// </summary>
    /// <param name="strContent">待编码的字符</param>
    /// <param name="ms">输出流</param>
    ///<returns>True if the encoding succeeded, false if the content is empty or too large to fit in a QR code</returns>
    public static bool GetQRCode(string strContent, MemoryStream ms)
    {
      ErrorCorrectionLevel Ecl = ErrorCorrectionLevel.M; //误差校正水平 
      string Content = strContent;//待编码内容
      QuietZoneModules QuietZones = QuietZoneModules.Two; //空白区域 
      int ModuleSize = 12;//大小
      var encoder = new QrEncoder(Ecl);
      QrCode qr;
      if (encoder.TryEncode(Content, out qr))//对内容进行编码，并保存生成的矩阵
      {
        var render = new GraphicsRenderer(new FixedModuleSize(ModuleSize, QuietZones));
        render.WriteToStream(qr.Matrix, ImageFormat.Png, ms);
      }
      else
      {
        return false;
      }
      return true;
    }