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

namespace QRCodeUtil
{
    /// <summary>
    /// 二維碼生成
    /// </summary>
    public class QRCodeHelper
    {
        #region 根據鏈接獲取二維碼
        /// <summary>
        /// 根據鏈接獲取二維碼
        /// </summary>
        /// <param name="link">鏈接</param>
        /// <returns>返回二維碼圖片</returns>
        public static Bitmap GetQRCodeBmp(string link)
        {
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeScale = 4;
            qrCodeEncoder.QRCodeVersion = 0;
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            Bitmap bmp = qrCodeEncoder.Encode(link);

            return bmp;
        }
        #endregion

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using QRCodeUtil;

namespace SWX
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Bitmap bmp = QRCodeHelper.GetQRCodeBmp(@"http://www.baidu.com/");
            string str = HttpContext.Current.Request.MapPath("http://aa.bmp");
            bmp.Save(str);
        }
    }
}