通过通过code获取网页授权access_token和用户唯一标识Openid,最后拉取用户信息(需要scope为snsapi_userinfo)

/// <summary>/// 微信登录注册（通过unionid来判断之前是否已经存在同一个工作平台注册过的账号，假如存在的话则关联起来，不存在注册一个新的账号）/// </summary>/// <param name="code">获取用户凭证换取用户网页授权</param>/// <param name="ReturnUrl">跳转地址</param>/// <returns></returns>public async Task<ActionResult> WxRegisterAndLogin(string code, string ReturnUrl = ""){try{//登录成功后跳转的地址string url=ReturnUrl;//通过Code以及微信appscrect和wxappid换取网页授权access_token和用户oppenidHttpClient webClient = new HttpClient();var jsonString = await (await webClient.GetAsync("https://api.weixin.qq.com/sns/oauth2/access_token?appid=" +公众号appid+ "&secret=" + 公众号AppSecret + "&code=" + code + "&grant_type=authorization_code")).Content.ReadAsStringAsync();//异步获取的用户oppenid和access_tokenvar jsonOAuthorObj = JsonConvert.DeserializeObject(jsonString, new { access_token = "", openid = "" }.GetType());if (jsonOAuthorObj.openid == null){return Content(jsonString + "出现错误请重试");}var myuser = new user { WxOpenId = jsonOAuthorObj.openid }.SelectObject();//注册成功后直接登录，授权会判断是否有账户if (myuser == null){//拉取用户信息(需scope为 snsapi_userinfo)，和unionid(只有在用户将公众号绑定到微信开放平台帐号后，才会出现该字段)jsonString = await (await webClient.GetAsync("https://api.weixin.qq.com/sns/userinfo?access_token=" + jsonOAuthorObj.access_token + "&openid=" + jsonOAuthorObj.openid + "&lang=zh_CN")).Content.ReadAsStringAsync();dynamic jsonObj = JsonConvert.DeserializeObject(jsonString, new { nickname = "", headimgurl = "", sex = "", openid = "", country = "", province = "", city = "",unionid=""}.GetType());//查询系统中是否存在unionid用户信息，若存在则更新当前用户openid，并直接登录，如果不存在的话则需要创建一个新的用户信息var isExistUserInfo=new user(){unionid=unionid }.SelectObject();if(isExistUserInfo!=null)//存在该用户记录{//更新公众号openid isExistUserInfo.WxOpenId=jsonObj.openid; isExistUserInfo.Update();//存在用户信息直接登录return Redirect(url);}else//不存在该用户记录{//创建用户int cUserId = new user { Wximage= jsonObj.headimgurl, WxNickName = jsonObj.nickname, WxOpenId = jsonObj.openid, Sex = Convert.ToInt32(jsonObj.sex), Country = jsonObj.country, Province = jsonObj.province, City = jsonObj.city，unionid=unionid }.Create();return RedirectToAction("WxRegister", "Login", new { ReturnUrl = url });}}else{//存在用户信息直接登录return Redirect(url);}}catch (Exception e){return View("MessageInfo", "", e.ToString());}}

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