以下是生成二维码的方法，我只用其中一个方法 这个需要引用ZXing.DLL 
View Code
链接：https://pan.baidu.com/s/1mCTwHiAm_awtsPcibAotZw
提取码：ufp6 public class QRcode { //需要引用ZXing.DLL 可以百度一下 一个很好用的二维码生成程序集《DLL文件啦》 //使用案例：Bitmap img3 = GenByZXingNet(""); //使用案例：img3.Save(Server.MapPath(@"\testImg\erweima.png")); /// /// 生成二维码 /// /// 二维码信息 /// 正方形 边长 /// 图片 public static Bitmap GenByZXingNet(string msg, int codeSizeInPixels = 250) { BarcodeWriter writer = new BarcodeWriter(); writer.Format = BarcodeFormat.QR_CODE; writer.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");//编码问题 writer.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H); writer.Options.Height = writer.Options.Width = codeSizeInPixels; writer.Options.Margin = 0;//设置边框1 ZXing.Common.BitMatrix bm = writer.Encode(msg); Bitmap img = writer.Write(msg); return img; } #endregion #region C#生成带有Log的二维码 /// /// 生成带Logo的二维码 /// /// 文本内容 static void Generate(string text, string LogoPth, string serverPth, ImageFormat imgFrt) { //Logo 图片 Bitmap logo = new Bitmap(LogoPth); //构造二维码写码器 MultiFormatWriter writer = new MultiFormatWriter(); Dictionary hint = new Dictionary (); hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8"); hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //生成二维码 BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, 300, 300, hint); BarcodeWriter barcodeWriter = new BarcodeWriter(); Bitmap map = barcodeWriter.Write(bm); //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸） int[] rectangle = bm.getEnclosingRectangle(); //计算插入图片的大小和位置 int middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width); int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height); int middleL = (map.Width - middleW) / 2; int middleT = (map.Height - middleH) / 2; //将img转换成bmp格式，否则后面无法创建Graphics对象 Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb); using (Graphics g = Graphics.FromImage(bmpimg)) { g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; g.DrawImage(map, 0, 0); } //将二维码插入图片 Graphics myGraphic = Graphics.FromImage(bmpimg); //白底 myGraphic.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH); myGraphic.DrawImage(logo, middleL, middleT, middleW, middleH); //保存成图片 bmpimg.Save(serverPth, imgFrt); } #endregion #region ZXing生成条形码 /// /// 文本内容 /// /// 只支持数字 只支持偶数个 最大长度80 /// 存储路径 @"H:\桌面\截图\generate2.png" public static void Generate(string text, string ServerPth, ImageFormat imgFrt) { BarcodeWriter writer = new BarcodeWriter(); //使用ITF 格式，不能被现在常用的支付宝、微信扫出来 //如果想生成可识别的可以使用 CODE_128 格式 //writer.Format = BarcodeFormat.ITF; writer.Format = BarcodeFormat.CODE_128; EncodingOptions options = new EncodingOptions() { Width = 150, Height = 50, Margin = 2 }; writer.Options = options; Bitmap map = writer.Write(text); string filename = ServerPth;//请注意 保存格式和文件扩展名一致性 map.Save(filename, imgFrt); } /// /// 文本内容 生成条形码 /// /// 只支持数字 最大长度80 /// 文件夹名称 /// 文件名 public static string GenerateTxm(string text, string category, string fileName, ImageFormat imgFrt) { var uploadPath = System.Configuration.ConfigurationSettings.AppSettings["UploadPath"]; //文件保存目录路径 string dirTempPath = uploadPath + "//" + category; if (!Directory.Exists(dirTempPath)) { Directory.CreateDirectory(dirTempPath); } string ServerPth = dirTempPath + "//" + fileName;//文件绝对路径 BarcodeWriter writer = new BarcodeWriter(); //使用ITF 格式，不能被现在常用的支付宝、微信扫出来 //如果想生成可识别的可以使用 CODE_128 格式 //writer.Format = BarcodeFormat.ITF; writer.Format = BarcodeFormat.CODE_128; EncodingOptions options = new EncodingOptions() { Width = 150, Height = 50, Margin = 2 }; writer.Options = options; Bitmap map = writer.Write(text); string filename = ServerPth;//请注意 保存格式和文件扩展名一致性 map.Save(filename, imgFrt); return ServerPth; } #endregion #region 二维码 条形码读取 /// /// 二维码 条形码读取 /// /// 文件路径 /// /// 生成二维码 /// /// 二维码信息 /// 正方形 边长 /// 图片 public static Bitmap GenByZXingNet_Color(string msg, int codeSizeInPixels = 250) { BarcodeWriter writer = new BarcodeWriter(); writer.Renderer = new ZXing.Rendering.BitmapRenderer { Background = Color.Red, Foreground = Color.Blue }; writer.Format = BarcodeFormat.QR_CODE; writer.Options.Hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");//编码问题 writer.Options.Hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H); writer.Options.Height = writer.Options.Width = codeSizeInPixels; writer.Options.Margin = 0;//设置边框1 ZXing.Common.BitMatrix bm = writer.Encode(msg); Bitmap img = writer.Write(msg); return img; } }
Bitmap b = QRcode.GenByZXingNet("二维码内容字符串"); MemoryStream ms = new MemoryStream(); b.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); byte[] bytes = ms.GetBuffer(); string textString = System.Convert.ToBase64String(bytes);//存DBd的字符串 ms.Close();
string ImgString;//存DB的字符串byte[] arrBuffer = System.Convert.FromBase64String(ImgString);//转换成文件流
页面上展示
我上面是后端的写法，现在用下面的写法比较简单
使用jquery.qrcode生成二维码
https://www.cnblogs.com/zhengweijie/p/6911834.html