网站微信登录授权 ASP.NET

微信认证流程（我自己简称三次握手）：

1、用户同意授权，获取code

2、通过code换取网页授权access_token，用户openId等信息

3、通过access_token和用户的openId获取该用户的用户信息

因为第一步必须要经过微信的登录授权，不能网页后端请求，所以先要经过用户同意，通过页面网页请求组装的微信请求链接。请求该链接，

获取code后，后端模拟请求。获取用户信息。

微信三次握手的方法（代码）

public class WeiXinOAuth
    {
        /// <summary>
        /// 获取微信Code
        /// </summary>
        /// <param name="appId">微信AppId</param>
        /// <param name="appSecret">微信AppSecret</param>
        /// <param name="redirectUrl">返回的登录地址，要进行Server.Un编码</param>
        /// <param name="isWap">true=微信内部登录 false=pc网页登录</param>
        public string GetWeiXinCode(string appId, string appSecret, string redirectUrl,bool isWap)
        {
            var r = new Random();
            //微信登录授权
            //string url = "https://open.weixin.qq.com/connect/qrconnect?appid=" + appId + "&redirect_uri=" + redirectUrl +"&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";
            //微信OpenId授权
            //string url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appId + "&redirect_uri=" + redirectUrl +"&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";
            //微信用户信息授权
            var url="";
            if (isWap)
            {
                url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appId + "&redirect_uri=" +
                      redirectUrl + "&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";
            }
            else
            {
                url = "https://open.weixin.qq.com/connect/qrconnect?appid=" + appId + "&redirect_uri=" + redirectUrl +
                      "&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";
            }
            return url;
        }
        /// <summary>
        /// 通过code获取access_token
        /// </summary>
        /// <param name="appId"></param>
        /// <param name="appSecret"></param>
        /// <param name="code"></param>
        /// <returns></returns>
        public WeiXinAccessTokenResult GetWeiXinAccessToken(string appId, string appSecret, string code)
        {
            string url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appId + "&secret=" + appSecret +
              "&code=" + code + "&grant_type=authorization_code";
            string jsonStr = UtilsHelper.GetHttp(url);
            var result = new WeiXinAccessTokenResult();
            if (jsonStr.Contains("errcode"))
            {
                var errorResult = JsonHelper.JsonDeserialize<WeiXinHelper.WeiXinErrorMsg>(jsonStr);
                result.ErrorResult = errorResult;
                result.Result = false;
            }
            else
            {
                var model = JsonHelper.JsonDeserialize<WeiXinAccessTokenModel>(jsonStr);
                result.SuccessResult = model;
                result.Result = true;
            }
            return result;
        }
        /// <summary>
        /// 拉取用户信息
        /// </summary>
        /// <param name="accessToken"></param>
        /// <param name="openId"></param>
        /// <returns></returns>
        public WeiXinHelper.WeiXinUserInfoResult GetWeiXinUserInfo(string accessToken, string openId)
        {
            string url = "https://api.weixin.qq.com/sns/userinfo?access_token=" + accessToken + "&openid=" + openId + "⟨=zh_CN";
            string jsonStr = UtilsHelper.GetHttp(url);
            var result = new WeiXinHelper.WeiXinUserInfoResult();
            if (jsonStr.Contains("errcode"))
            {
                var errorResult = JsonHelper.JsonDeserialize<WeiXinHelper.WeiXinErrorMsg>(jsonStr);
                result.ErrorMsg = errorResult;
                result.Result = false;
            }
            else
            {
                var userInfo = JsonHelper.JsonDeserialize<WeiXinHelper.WeiXinUserInfo>(jsonStr);
                result.UserInfo = userInfo;
                result.Result = true;
            }
            return result;
        }

/// <summary>
    /// 通过code获取access_token 请求成功的实体
    /// </summary>
    public class WeiXinAccessTokenModel
    {
        /// <summary>
        /// 接口调用凭证
        /// </summary>
        public string access_token { get; set; }
        /// <summary>
        /// access_token接口调用凭证超时时间，单位（秒）
        /// </summary>
        public int expires_in { get; set; }
        /// <summary>
        /// 用户刷新access_token
        /// </summary>
        public string refresh_token { get; set; }
        /// <summary>
        /// 授权用户唯一标识
        /// </summary>
        public string openid { get; set; }
        /// <summary>
        /// 用户授权的作用域，使用逗号（,）分隔
        /// </summary>
        public string scope { get; set; }
    }

public class WeiXinAccessTokenResult
    {
        public WeiXinAccessTokenModel SuccessResult { get; set; }
        public bool Result { get; set; }
 
        public WeiXinHelper.WeiXinErrorMsg ErrorResult { get; set; }
    }

/// <summary>
    /// 微信帮助类
    /// </summary>
    public class WeiXinHelper
    {
        /// <summary>
        /// 微信错误访问的情况
        /// </summary>
        public class WeiXinErrorMsg
        {
            /// <summary>
            /// 错误编号
            /// </summary>
            public int errcode { get; set; }
            /// <summary>
            /// 错误提示消息
            /// </summary>
            public string errmsg { get; set; }
        }
 
        /// <summary>
        /// 获取微信用户信息
        /// </summary>
        public class WeiXinUserInfoResult
        {
            /// <summary>
            /// 微信用户信息
            /// </summary>
            public WeiXinUserInfo UserInfo { get; set; }
            /// <summary>
            /// 结果
            /// </summary>
            public bool Result { get; set; }
            /// <summary>
            /// 错误信息
            /// </summary>
            public WeiXinErrorMsg ErrorMsg { get; set; }
        }
 
        /// <summary>
        /// 微信授权成功后，返回的用户信息
        /// </summary>
        public class WeiXinUserInfo
        {
            /// <summary>
            /// 用户的唯一标识
            /// </summary>
            public string openid { get; set; }
            /// <summary>
            /// 用户昵称
            /// </summary>
            public string nickname { get; set; }
            /// <summary>
            /// 用户的性别，值为1时是男性，值为2时是女性，值为0时是未知
            /// </summary>
            public string sex { get; set; }
            /// <summary>
            /// 用户个人资料填写的省份
            /// </summary>
            public string province { get; set; }
            /// <summary>
            /// 普通用户个人资料填写的城市
            /// </summary>
            public string city { get; set; }
            /// <summary>
            /// 国家，如中国为CN
            /// </summary>
            public string country { get; set; }
            /// <summary>
            /// 用户头像，最后一个数值代表正方形头像大小（有0、46、64、96、132数值可选，0代表640*640正方形头像），用户没有头像时该项为空
            /// </summary>
            public string headimgurl { get; set; }
            /// <summary>
            /// 用户特权信息，json 数组，如微信沃卡用户为（chinaunicom）
            /// </summary>
            public string[] privilege { get; set; }
        }
    }

以上代码，直接在一个类库里面建相应的类就可以，直接封装就ok

下面是前台使用的代码

//获取appId,appSecret的配置信息
            string appId = ConfigHelper.GetConfigString("WwAppId");
            string appSecret = ConfigHelper.GetConfigString("WwAppSecret");
 
            var weixinOAuth = new WeiXinOAuth();
            //微信第一次握手后得到的code 和state
            string code = FytRequest.GetQueryString("code");
            string state = FytRequest.GetQueryString("state");
            if (code == "" || code == "authdeny")
            {
                if (code == "")
                {
                    //发起授权(第一次微信握手)
                    string authUrl = weixinOAuth.GetWeiXinCode(appId, appSecret, Server.UrlEncode(Request.Url.ToString()),true);
                    Response.Redirect(authUrl, true);
                }
                else
                {
                    // 用户取消授权
                    Response.Redirect("~/Error.html", true);
                }
            }
            else
            {
                //获取微信的Access_Token（第二次微信握手）
                var modelResult = weixinOAuth.GetWeiXinAccessToken(appId, appSecret, code);
                //获取微信的用户信息(第三次微信握手)
                var userInfo = weixinOAuth.GetWeiXinUserInfo(modelResult.SuccessResult.access_token, modelResult.SuccessResult.openid);
                //用户信息（判断是否已经获取到用户的微信用户信息）
                if (userInfo.Result && userInfo.UserInfo.openid != "")
                {
                    //根据OpenId判断数据库是否存在，如果存在，直接登录即可
                    var oauthUser =
                        OperateContext<tb_UserLoginOauth>.SetServer.GetModel(m => m.OpenId == userInfo.UserInfo.openid);
                    if (oauthUser != null)
                    {
                        //直接登录即可  根据授权ID，查询用户信息
                        if (HttpContext.Session != null) HttpContext.Session["FytUser"] = oauthUser.tb_User;
                        UtilsHelper.WriteCookie("FytUserId",
                            DESEncrypt.Encrypt(oauthUser.tb_User.ID.ToString(CultureInfo.InvariantCulture)));
                    }
                    else
                    {
                        //注册操作
                        OauthReg(userInfo);
                    }
                    //授权成功后，直接返回到首页
                    return RedirectToAction("Index", "MHome");
                }
                else
                {
                    return Content("授权失败，请返回重新操作！");
                }
            }

来源：https://www.cnblogs.com/zxtceq/p/10033517.html

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