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直接上代码

namespace CloudPrj.WeiXin
{
    public partial class index : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Diyi();
            //string url ="https://open.weixin.qq.com/connect/qrconnect?appid=" + appid + "&redirect_uri=" + reredirect_url + "&response_type=code&scope=snsapi_login&state=" + secret + "#wechat_redirect";

        }
        public void Diyi()
        {
            string appid = "wxc14f8e4042ba5463";      //公众号appid
            string secret = "322316fe831c7a2137fea0b4a62a2970";  //开发者密码
            string reredirect_url = "http://www.hai121.com/WeiXin/WebForm1.aspx";
            //回调链接，当请求完接口，会以get的方式传code参数给这个url
            string url = "https://open.weixin.qq.com/connect/qrconnect?appid=" + appid + "&redirect_uri=" + reredirect_url + "&response_type=code&scope=snsapi_login&state=" + secret + "#wechat_redirect";
            //普通授权，需要用户自己手动授权
            //$url="https://open.weixin.qq.com/connect/oauth2/authorize?appid=$appid&redirect_uri=$reredirect_uri&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect"; 
            //静默授权不需要用户手动授权，就是没有授权页面
            Response.Redirect(url);
        }
    }
}

 public partial class index_HD : Page
    {
        string appid = "wxc14f8e4042ba5463";      //公众号appid
        string secret = "322316fe831c7a2137fea0b4a62a2970";  //开发者密码
        Result t;
        protected void Page_Load(object sender, EventArgs e)
        {
            string coem = Request["coem"];
            string token = getToken(coem);
            RefreshToken(token);
            getuser(token);
        }
        public static T JsonDeserialize<T>(string jsonString)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            T obj = (T)ser.ReadObject(ms);
            return obj;
        }
        //通过code获取openid
        private string getToken(string code)
        {
        https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code
            string _url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + appid + "&secret=" + secret + "&code=" + code + "&grant_type=authorization_code";
            WebClient wc = new WebClient();
            //取得微信返回的openid,access_token数据  
            String strReturn = wc.DownloadString(_url);
            Result b = new Result();
            //if (comHelper.InsertOp(b, "D_C_L", "D_id", this.Request, true, form1) > 0)
            //{

            //}
            t = JsonDeserialize<Result>(strReturn);
            return t.access_token;
        }

        //刷新
        private string RefreshToken(string token)
        {
        https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=APPID&grant_type=refresh_token&refresh_token=REFRESH_TOKEN
            string _url = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + appid + "&grant_type=refresh_token&refresh_token=" + token;
            WebClient wc = new WebClient();
            //取得微信返回的openid,access_token数据  
            String strReturn = wc.DownloadString(_url);
            Result b = new Result();
            //if (comHelper.InsertOp(b, "D_C_L", "D_id", this.Request, true, form1) > 0)
            //{

            //}
            t = JsonDeserialize<Result>(strReturn);
            return strReturn;
        }

        //获取用户
        private string getuser(string token)
        {
            string _url = "https://api.weixin.qq.com/sns/userinfo?access_token=" + t.access_token + "&openid=" + t.openid + "&lang=zh_CN";
            WebClient wc = new WebClient();
            //取得微信返回的openid,access_token数据  
            String strReturn = wc.DownloadString(_url);
            Result b = new Result();
            //if (comHelper.InsertOp(b, "D_C_L", "D_id", this.Request, true, form1) > 0)
            //{

            //}
            return strReturn;
        }

源码下载 https://download.csdn.net/download/weixin_41472521/10656043