.net core 实现微信登陆

     
 public const string appId = "";//申请的微信给的appId
        public const string appSecret = "";//申请的微信给的appsecret
        public const string redirecturl = "";//申请的微信的回调地址
   #region 微信登陆
        /// <summary>
        /// 微信授权页面
        /// </summary>
        /// <returns></returns>
        public virtual IActionResult WechatAuthorize()
        {
            var url = $"https://open.weixin.qq.com/connect/qrconnect?appid={appId}&redirect_uri={redirecturl}&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";
            return new RedirectResult(url);
        }
        /// <summary>
        /// 微信回调方法
        /// </summary>
        /// <returns></returns>
        public virtual IActionResult WechatLogin()
        {
            var code = Request.Query["code"];
            var dis = GetAuthorityWechatAccessToken(code);
            if (!dis.ContainsKey("openid") || !dis.ContainsKey("access_token"))
                return null;
            var userinfo = GetWechatUserInfo(dis["access_token"], dis["openid"]);
            return null;
        }

        /// <summary>
        /// 微信比QQ在获取Token的时候返回了OpenId和UnionId。
        /// </summary>
        /// <param name="code"></param>
        /// <returns></returns>
        public virtual Dictionary<string,string> GetAuthorityWechatAccessToken(string code)
        {
            if (string.IsNullOrEmpty(code))
                return null;
            var 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);
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            var json = WebRequestHelper.GetResponse(request, "utf-8");
            if (string.IsNullOrEmpty(json))
                return null;
            if (!json.Contains("access_token"))
            {
                return null;
            }
            var dis = json.DeserializeJson<Dictionary<string, string>>();
            return dis;
        }

        /// <summary>
        /// 获取微信用户信息
        /// </summary>
        /// <param name="token"></param>
        /// <param name="openid"></param>
        /// <returns></returns>
        public virtual  Dictionary<string,object>GetWechatUserInfo(string token,string openid)
        {
            var url = $"https://api.weixin.qq.com/sns/userinfo?access_token={token}&openid={openid}";
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            var json = WebRequestHelper.GetResponse(request, "utf-8");
            var dis = json.DeserializeJson<Dictionary<string, object>>();
            if (dis == null || dis.ContainsKey("errcode"))
                return null;
            return dis;
        }

        #endregion

//请求接口方法   
public static string GetResponse(WebRequest request, string encoding)
        {
            using (WebResponse response = request.GetResponse())
            {
                var stream = response.GetResponseStream();
                if (stream == null) return null;
                using (var reader = new StreamReader(stream, Encoding.GetEncoding(encoding)))
                {
                    return reader.ReadToEnd();
                }
            }
        }

这个没有测试登陆，因为看文档和QQ登陆大同小异，连代码都是差不多的。所以就没有测试了。

望参考的游客，还仅供参考。