.NET C# WeChat 公式アカウントを使用して Web サイトにログインする場合の分析例

using Microsoft.AspNet.SignalR;
using Microsoft.AspNet.SignalR.Hubs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WD.C.Utility
{
 /// <summary>
 /// 标注Single javascription要连接的名称
 /// </summary>
 [HubName("pushHub")]
 public class PushHub : Hub
 {
 /// <summary>
 /// 临时保存请求的用户
 /// </summary>
 static Dictionary<string, string> rlist = new Dictionary<string, string>();
 
 /// <summary>
 /// 登录请求的用户;打开Login页执行本方法,用于记录浏览器连接的ID
 /// </summary>
 public void ruserConnected()
 {
 if (!rlist.ContainsKey(Context.ConnectionId))
 rlist.Add(Context.ConnectionId, string.Empty);

 //Client方式表示对指定ID的浏览器发送GetUserId方法,浏览器通过javascrip方法GetUserId(string)得到后台发来的Context.ConnectionId
 Clients.Client(Context.ConnectionId).GetUserId(Context.ConnectionId);
 }
 /// <summary>
 /// 实际登录的用户
 /// </summary>
 /// <param name="ruser">请求的用户ID</param>
 /// <param name="logUserID">微信OPENID</param>
 public void logUserConnected(string ruser, string logUserID)
 {
 if (rlist.ContainsKey(ruser))
 {
 rlist.Remove(ruser);

 //Client方式表示对指定ID的浏览器发送GetUserId方法,浏览器通过javascrip方法userLoginSuccessful(bool,string)得到后台发来的登录成功，和微信OPENID
 Clients.Client(ruser).userLoginSuccessful(true, logUserID);
 }
 }
 }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace WD.C.Controllers
{
 public class QRController : Controller
 {
 //
 // GET: /QR/

 public ActionResult Index()
 {
 return View();
 }
 /// <summary>
 /// 获得2维码图片
 /// </summary>
 /// <param name="str"></param>
 /// <returns></returns>
 public ActionResult GetQRCodeImg(string str)
 {
 using (var ms = new System.IO.MemoryStream())
 {

 string stringtest = str;
 GetQRCode(stringtest, ms);
 Response.ContentType = "image/Png";
 Response.OutputStream.Write(ms.GetBuffer(), 0, (int)ms.Length);
 System.Drawing.Bitmap img = new System.Drawing.Bitmap(100, 100);
 img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
 Response.End();
 return File(ms.ToArray(), @"image/jpeg");
 }
 }
 private static bool GetQRCode(string strContent, System.IO.MemoryStream ms)
 {

 Gma.QrCodeNet.Encoding.ErrorCorrectionLevel Ecl = Gma.QrCodeNet.Encoding.ErrorCorrectionLevel.M; //误差校正水平 
 string Content = strContent;//待编码内容
 Gma.QrCodeNet.Encoding.Windows.Render.QuietZoneModules QuietZones = Gma.QrCodeNet.Encoding.Windows.Render.QuietZoneModules.Two; //空白区域 
 int ModuleSize = 12;//大小
 var encoder = new Gma.QrCodeNet.Encoding.QrEncoder(Ecl);
 Gma.QrCodeNet.Encoding.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 Gma.QrCodeNet.Encoding.Windows.Render.GraphicsRenderer(new Gma.QrCodeNet.Encoding.Windows.Render.FixedModuleSize(ModuleSize, QuietZones));
 render.WriteToStream(qr.Matrix, System.Drawing.Imaging.ImageFormat.Png, ms);
 }
 else
 {
 return false;
 }
 return true;
 }
 }
}

chat.client.getUserId = function (ruserid)
{
　　//二维码生成的文本
$("#loga").attr("src", "@ViewBag.Url" + ruserid);
}

chat.client.userLoginSuccessful = function (r, userid) {
 if (r) {
 $.post("/Login/AddSession/", { userid: userid }, function (r2) {
 if (r2) {
 location.href = "/Home/";
 }
 })
 }
 };

/// <summary>
 /// 保存微信确认登录后返回的OPENID，做为网站的Session["LogUserID"]
 /// </summary>
 /// <param name="userid"></param>
 /// <returns></returns>
 public JsonResult AddSession(string userid)
 {
 Session["LogUserID"] = userid;
 return Json(true);
 }

 public static string GetOpenIDByCode(string code)
 {
 string url =string.Format( "https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code",AppID,AppSecret, code);
 using (System.Net.WebClient client = new System.Net.WebClient())
 {
 string tempstr= client.DownloadString( url);
 var regex= new Regex(@"\""openid\"":\""[^\""]+?\"",", RegexOptions.IgnoreCase);
 string tempstr2= regex.Match(tempstr).Value;
 return tempstr2.Substring(10, tempstr2.Length - 12);
 }
 }