微信网页授权登录(c# Webform)

Bertha 。 2021-06-26 16:06 701阅读 0赞

\#\#Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
    
    <!DOCTYPE html>
    
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta http-equiv="X-UA-Compatible" content="chrome=1,webkit=1,IE=edge" />
        <meta name="viewport" content="user-scalable=no,width=device-width,initial-scale=1.0,maximum-scale=1.0" />
        <title>微信授权登录</title>
    </head>
    <body>
    </body>
    </html>

\#\#Default.aspx.cs

using System;
    using Newtonsoft.Json;
    
    public partial class _Default : WeiXinPage
    {
        protected override void OnLoad(EventArgs e)
        {
            Response.Write(JsonConvert.SerializeObject(Data));
            base.OnLoad(e);
        }
    }

\#\#WeiXinPage.cs

using System;
    using System.Collections.Generic;
    using System.Web;
    using System.Web.SessionState;
    using System.Web.UI;
    using Newtonsoft.Json;
    
    /// <summary>
    ///     WeiXin 的摘要说明
    /// </summary>
    public abstract class WeiXinPage : Page, IRequiresSessionState
    {
        /// <summary>
        ///     是否访客身份 true:是 false:否
        /// </summary>
        public static bool isGuest
        {
            get { return HttpContext.Current.Session[_user] == null ? true : false; }
        }
    
        private static string _user
        {
            get { return "$wxuser"; }
        }
    
        private static string _code
        {
            get { return "$wxcode"; }
        }
    
        private static string _AbsoluteUri
        {
            get { return HttpContext.Current.Request.Url.AbsoluteUri; }
        }
    
        /// <summary>
        ///     该路径剔除微信Query的URL用于页面重定向获取最新的用户信息
        /// </summary>
        private static string _RawUrl
        {
            get
            {
                var url = HttpContext.Current.Request.Url.AbsoluteUri;
                url = url.Replace(url.Substring(url.IndexOf("code"), url.IndexOf("STATE") + 5 - url.IndexOf("code")), "");
                return url;
            }
        }
    
        /// <summary>
        ///     微信用户信息
        /// </summary>
        public Dictionary<string, object> Data
        {
            get { return getWxUser(); }
        }
    
        protected sealed override void OnPreInit(EventArgs e)
        {
            if (isGuest)
            {
                getWxUser();
            }
            base.OnPreInit(e);
        }
    
        /// <summary>
        ///     获取微信用户信息
        /// </summary>
        private static Dictionary<string, object> getWxUser()
        {
            string code = HttpContext.Current.Request.QueryString.Get("code") ?? "",
                url = "",
                ret = "";
            try
            {
                var user = HttpContext.Current.Session[_user];
                if (code.Length == 0 && user == null)
                {
                    JumpUrl();
                    return null;
                }
                if (user != null)
                    return
                        JsonConvert.DeserializeObject<Dictionary<string, object>>(
                            HttpContext.Current.Session[_user].ToString());
    
                #region /*如果session中不存在user信息则对接微信接口获取用户信息*/
    
                /* 根据code获取access_token */
                url =
                    string.Format(
                        "https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code"
                        , Config.AppId
                        , Config.AppSecret
                        , code);
                ret = HttpService.Get(url);
                var o = JsonConvert.DeserializeObject<Dictionary<string, string>>(ret);
    
                #region 注意处理微错误{"errcode":40163, "errmsg":"code been used"} 以及{"errcode":40029, "errmsg":"invalid code"}
    
                if (o.ContainsKey("errmsg"))
                {
                    if (o["errcode"] == "40163" || o["errcode"] == "40029")
                    {
                        HttpContext.Current.Response.Redirect(_RawUrl, false);
                        return null;
                    }
                    throw new Exception(o["errmsg"]);
                }
    
                #endregion
    
                /* 根据access_token和openid获取用户信息 */
                url = string.Format("https://api.weixin.qq.com/sns/userinfo?access_token={0}&openid={1}&lang=zh_CN"
                    , o["access_token"]
                    , o["openid"]);
                ret = HttpService.Get(url);
                /*保存用户到Session*/
                HttpContext.Current.Session[_user] = ret;
    
                #endregion
    
                return
                    JsonConvert.DeserializeObject<Dictionary<string, object>>(HttpContext.Current.Session[_user].ToString());
            }
            catch
            {
                throw;
            }
        }
    
        /// <summary>
        ///     跳转至微信授权登录页
        /// </summary>
        private static void JumpUrl()
        {
            var url =
                string.Format(
                    "https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect"
                    , Config.AppId
                    , _AbsoluteUri);
            HttpContext.Current.Response.Redirect(url, false);
        }
    }

\#\#HttpService.cs

using System;
    using System.Collections.Specialized;
    using System.Net;
    using System.Text;
    
    /// <summary>
    ///     HttpService 的摘要说明
    /// </summary>
    public class HttpService
    {
        public static string Get(string url)
        {
            using (var c = new WebClient())
            {
                try
                {
                    c.Encoding = Encoding.UTF8;
                    return c.DownloadString(url);
                }
                catch (Exception)
                {
                    throw;
                }
            }
        }
    
    
        public static string GetPost(string url, string parameters)
        {
            var ret = "";
            using (var c = new WebClient())
            {
                try
                {
                    c.Encoding = Encoding.UTF8;
                    var data = Encoding.UTF8.GetBytes(parameters);
                    c.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                    c.Headers.Add("ContentLength", parameters.Length.ToString());
                    ret = Encoding.UTF8.GetString(c.UploadData(url, "POST", data));
                    return ret;
                }
                catch (Exception)
                {
                    throw;
                }
            }
        }
    
    
        public static string GetPost(string url, NameValueCollection nv)
        {
            using (var c = new WebClient())
            {
                try
                {
                    c.Encoding = Encoding.UTF8;
                    return Encoding.UTF8.GetString(c.UploadValues(url, "POST", nv));
                }
                catch (Exception)
                {
                    throw;
                }
            }
        }
    }

\#\#Config.cs

using System.Collections.Generic;
    using System.Net;
    using System.Text;
    using System.Web;
    using System.Web.SessionState;
    using Newtonsoft.Json;
    
    /// <summary>
    ///     微信公众号配置文件
    /// </summary>
    public class Config : IRequiresSessionState
    {
        /// <summary>
        ///     开发者ID
        /// </summary>
        public static string AppId { get; set; }
    
        /// <summary>
        ///     开发者密码
        /// </summary>
        public static string AppSecret { get; set; }
    
        /// <summary>
        ///     APP access_token 7200秒更新一次
        /// </summary>
        public static string access_token
        {
            get
            {
                try
                {
                    if (HttpContext.Current.Session["$access_token"] == null)
                    {
                        using (var wc = new WebClient())
                        {
                            wc.Encoding = Encoding.UTF8;
                            var ret =
                                wc.DownloadString(
                                    string.Format(
                                        "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}",
                                        AppId, AppSecret));
                            var o = JsonConvert.DeserializeObject<Dictionary<string, object>>(ret);
                            if (o.ContainsKey("errmsg")) return o["errmsg"].ToString();
                            HttpContext.Current.Session.Add("$access_token", o["access_token"].ToString());
                            HttpContext.Current.Session.Timeout = 7200;
                            return o["access_token"].ToString();
                        }
                    }
                    return HttpContext.Current.Session["$access_token"].ToString();
                }
                catch
                {
                    throw;
                }
            }
        }
    }

\#\#Global.asax

<%@ Application Language="C#" %>
    
    <script RunAt="server">
    
        private void Application_Start(object sender, EventArgs e)
        {
            // 在应用程序启动时运行的代码
            Config.AppId = "wx*********aaaa";
            Config.AppSecret = "5454564564646546465456";
        }
    
        private void Application_End(object sender, EventArgs e)
        {
            //  在应用程序关闭时运行的代码
        }
    
        private void Application_Error(object sender, EventArgs e)
        {
            // 在出现未处理的错误时运行的代码
        }
    
        private void Session_Start(object sender, EventArgs e)
        {
            // 在新会话启动时运行的代码
        }
    
        private void Session_End(object sender, EventArgs e)
        {
            // 在会话结束时运行的代码。 
            // 注意: 只有在 Web.config 文件中的 sessionstate 模式设置为
            // InProc 时，才会引发 Session_End 事件。如果会话模式设置为 StateServer
            // 或 SQLServer，则不引发该事件。
        }
    
    </script>