C# MVC 微信授权登录 OAuth2.0授权登录

首先一定要熟读，最起码过一遍微信开发者文档

微信开发者文档

文档写的很清楚 

授权登录四步走

在正文开始前，我得讲清楚一个事情

敲黑板，划重点：微信一共有两个 access_token

一个是7200就过期的，一个是登录用的。这两个有本质区别，授权登录只会用到后者

======================正文开始======================

        /// 

        /// 微信登录
        /// 
        /// 
        public ActionResult WechatLogin()
        {
            if (!string.IsNullOrEmpty(Request["code"]))
            {
                //根据appid，secret，code取到用户的全部信息
                Dictionary dic = GetUserInfoByCode(AppId, AppSecret, Request["code"].ToString());
                if (dic.ContainsKey("errcode"))
                {
                    return Redirect("/WError/Index?Msg=" + dic["errmsg"].ToString());
                }
                string openid = dic["openid"].ToString();
                //根据微信唯一标识openid  去数据库判断是否存在
                //1.不存在就新增
                Model.TBase_UserInfo u = BLL.TBase_UserInfo.Instence.GetUserByOpenId(openid);
                if (u == null)
                {
                    u = new Model.TBase_UserInfo();
                    u.Code = GetCode();
                    u.NickName = dic["nickname"].ToString();
                    u.HeadImage = dic["headimgurl"].ToString();
                    u.OpenId = openid;
                    u.IsOrder = 0;
                    u.Status = 1;
                    u.State = 1;
                    u.AddDate = DateTime.Now;

                    int id = BLL.TBase_UserInfo.Instence.Add(u);
                    u.ID = id;
                }
                Session[Esluo.Basic.Config.SESSION_KEY_FOR_USER] = u;
                return Redirect("/WHome/Index");
            }
            else
            {
                string redirect_uri = HttpUtility.UrlEncode("http://" + Request.Url.Authority + Request.Url.PathAndQuery);
                return Redirect(string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope={2}&state=STATE#wechat_redirect", AppId, redirect_uri, "snsapi_userinfo"));
            }
        }

        /// 

        /// 获得Code
        /// 
        /// 表
        /// 
        protected long GetCode()
        {
            Type type = typeof(T);
            return BLL.TSYS_Code.Instence.GetCode(type.Name);
        }

        /// 

        ///用code换取获取用户信息（包括非关注用户的）(此access_token是网页授权的和普通无关)
        /// 
        /// 
        /// 
        /// 回调页面带的code参数
        /// 获取用户信息（json格式）
        public Dictionary GetUserInfoByCode(string Appid, string Appsecret, string Code)
        {
            JavaScriptSerializer Jss = new JavaScriptSerializer();
            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);
            string ReText = WebRequestPostOrGet(url, "");//post/get方法获取信息
            Dictionary DicText = (Dictionary)Jss.DeserializeObject(ReText);
            if (!DicText.ContainsKey("openid"))
            {
                return DicText;
            }
            else
            {
                Dictionary respDic = (Dictionary)Jss.DeserializeObject(WebRequestPostOrGet("https://api.weixin.qq.com/sns/userinfo?access_token=" + DicText["access_token"] + "&openid=" + DicText["openid"] + "&lang=zh_CN", ""));
                return respDic;
            }
        }

        #region Post/Get提交调用抓取
        /// 

        /// Post/get 提交调用抓取
        /// 
        /// 提交地址
        /// 参数
        /// string
        public static string WebRequestPostOrGet(string sUrl, string sParam)
        {
            byte[] bt = System.Text.Encoding.UTF8.GetBytes(sParam);

            Uri uriurl = new Uri(sUrl);
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uriurl);//HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + (url.IndexOf("?") > -1 ? "" : "?") + param);
            req.Method = "Post";
            req.Timeout = 120 * 1000;
            req.ContentType = "application/x-www-form-urlencoded;";
            req.ContentLength = bt.Length;

            using (Stream reqStream = req.GetRequestStream())//using 使用可以释放using段内的内存
            {
                reqStream.Write(bt, 0, bt.Length);
                reqStream.Flush();
            }
            try
            {
                using (WebResponse res = req.GetResponse())
                {
                    //在这里对接收到的页面内容进行处理 

                    Stream resStream = res.GetResponseStream();

                    StreamReader resStreamReader = new StreamReader(resStream, System.Text.Encoding.UTF8);

                    string resLine;

                    System.Text.StringBuilder resStringBuilder = new System.Text.StringBuilder();

                    while ((resLine = resStreamReader.ReadLine()) != null)
                    {
                        resStringBuilder.Append(resLine + System.Environment.NewLine);
                    }

                    resStream.Close();
                    resStreamReader.Close();

                    return resStringBuilder.ToString();
                }
            }
            catch (Exception ex)
            {
                return ex.Message;//url错误时候回报错
            }
        }
        #endregion Post/Get提交调用抓取

没了

没错，就是这么简单，只有这么点内容就已经完成了整个微信授权登录的事情

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转载请记得说明作者和出处哦-.-
作者：KingDuDu
原文出处：https://blog.csdn.net/ljs70924/article/details/79897010

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