using Gma.QrCodeNet.Encoding;
using Gma.QrCodeNet.Encoding.Windows.Render;
using System;
using System.Collections.Generic;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Piano.Utility.Common
{public  class QRCodeHelper{/// <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;} }
}

 //二维码生成public ActionResult getQrCode(){// Render the QR code as an imageusing (var ms = new MemoryStream()){string url = string.Format(ConfigurationManager.AppSettings["WxgzhUrl"], UserValidator.GetInstituteId());string stringtest = url;QRCodeHelper.GetQRCode(stringtest, ms);Response.ContentType = "image/Png";Response.OutputStream.Write(ms.GetBuffer(), 0, (int)ms.Length);Response.End();}return View();}

 <img src="/My/getQrCode" alt="" style="width:160px;height:160px;" /><span class="remindmsg">扫一扫查看</span>