C# 生成二维码

项目引用引用ThoughtWorks.QRCode.dll 类

新建类QrCodeHelper

引用

using ThoughtWorks.QRCode.Codec;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

创建生成二维码的方法CreateEQcoder

/// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="qrCodeScale">尺寸4-15</param>
        /// <param name="qrCodeVersion">复杂级别3-12</param>
        /// <param name="qrCodeErrorCorrect">容错量"H","L","M","Q"</param>
        /// <param name="url">二维码信息</param>
        /// <param name="uId">用户ID（唯一标识）</param>
        /// <returns></returns>
        public static string CreateEQcoder(int qrCodeScale, int qrCodeVersion, string qrCodeErrorCorrect, string url, string uId)
        {
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeScale = qrCodeScale;
            qrCodeEncoder.QRCodeVersion = qrCodeVersion;
            switch (qrCodeErrorCorrect)
            {
                case "H":
                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
                    break;
                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;
            }
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
            Bitmap bmPhoto = qrCodeEncoder.Encode(url, System.Text.Encoding.GetEncoding("UTF-8"));
            string fileName = DateTime.Now.ToString("yyyy") + ".jpg";
            string savePath = "/Tempuploads/" + uId + "/QRCode/";

            string dirPath = System.Web.HttpContext.Current.Server.MapPath(savePath);

            try
            {
                if (!Directory.Exists(dirPath))
                {
                    Directory.CreateDirectory(dirPath);
                }
                bmPhoto.Save(System.Web.HttpContext.Current.Server.MapPath("/") + savePath + fileName, ImageFormat.Jpeg);
                bmPhoto.Dispose();
                return savePath + fileName;
            }
            catch (Exception)
            {
                return "";
            }
            finally
            {
                bmPhoto.Dispose();
            }
        }

解析二维码

QRCodeDecoder decoder = new QRCodeDecoder();   
String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(bmPhoto)));   
string Text = decodedString;