【第二十一篇】手C# MVC 微信授权登录 OAuth2.0授权登录

首先一定要熟读，最起码过一遍微信开发者文档

微信开发者文档

文档写的很清楚

授权登录四步走

在正文开始前，我得讲清楚一个事情

敲黑板，划重点：微信一共有两个 access_token

一个是7200就过期的，一个是登录用的。这两个有本质区别，授权登录只会用到后者

======================正文开始======================

/// <summary>
/// 微信登录
/// </summary>
/// <returns></returns>
public ActionResult WechatLogin()
{
    if (!string.IsNullOrEmpty(Request["code"]))
    {
        //根据appid，secret，code取到用户的全部信息
        Dictionary<string, object> dic = GetUserInfoByCode(AppId, AppSecret, Request["code"].ToString());
        if (dic.ContainsKey("errcode"))
        {
            return Redirect("/WError/Index?Msg=" + dic["errmsg"].ToString());
        }
        string openid = dic["openid"].ToString();
        //根据微信唯一标识openid  去数据库判断是否存在
        //1.不存在就新增
        Model.TBase_UserInfo u = BLL.TBase_UserInfo.Instence.GetUserByOpenId(openid);
        if (u == null)
        {
            u = new Model.TBase_UserInfo();
            u.Code = GetCode<Model.TBase_UserInfo>();
            u.NickName = dic["nickname"].ToString();
            u.HeadImage = dic["headimgurl"].ToString();
            u.OpenId = openid;
            u.IsOrder = ;
            u.Status = ;
            u.State = ;
            u.AddDate = DateTime.Now;  

            int id = BLL.TBase_UserInfo.Instence.Add(u);
            u.ID = id;
        }
        Session[Esluo.Basic.Config.SESSION_KEY_FOR_USER] = u;
        return Redirect("/WHome/Index");
    }
    else
    {
        string redirect_uri = HttpUtility.UrlEncode("http://" + Request.Url.Authority + Request.Url.PathAndQuery);
        return Redirect(string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope={2}&state=STATE#wechat_redirect", AppId, redirect_uri, "snsapi_userinfo"));
    }
}  

/// <summary>
/// 获得Code
/// </summary>
/// <typeparam name="T">表</typeparam>
/// <returns></returns>
protected long GetCode<T>()
{
    Type type = typeof(T);
    return BLL.TSYS_Code.Instence.GetCode(type.Name);
}  

/// <summary>
///用code换取获取用户信息（包括非关注用户的）(此access_token是网页授权的和普通无关)
/// </summary>
/// <param name="Appid"></param>
/// <param name="Appsecret"></param>
/// <param name="Code">回调页面带的code参数</param>
/// <returns>获取用户信息（json格式）</returns>
public Dictionary<string, object> GetUserInfoByCode(string Appid, string Appsecret, string Code)
{
    JavaScriptSerializer Jss = new JavaScriptSerializer();
    string 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);
    string ReText = WebRequestPostOrGet(url, "");//post/get方法获取信息
    Dictionary<string, object> DicText = (Dictionary<string, object>)Jss.DeserializeObject(ReText);
    if (!DicText.ContainsKey("openid"))
    {
        return DicText;
    }
    else
    {
        Dictionary<string, object> respDic = (Dictionary<string, object>)Jss.DeserializeObject(WebRequestPostOrGet("https://api.weixin.qq.com/sns/userinfo?access_token=" + DicText["access_token"] + "&openid=" + DicText["openid"] + "&lang=zh_CN", ""));
        return respDic;
    }
}  

#region Post/Get提交调用抓取
/// <summary>
/// Post/get 提交调用抓取
/// </summary>
/// <param name="url">提交地址</param>
/// <param name="param">参数</param>
/// <returns>string</returns>
public static string WebRequestPostOrGet(string sUrl, string sParam)
{
    byte[] bt = System.Text.Encoding.UTF8.GetBytes(sParam);  

    Uri uriurl = new Uri(sUrl);
    HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uriurl);//HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + (url.IndexOf("?") > -1 ? "" : "?") + param);
    req.Method = "Post";
    req.Timeout =  * ;
    req.ContentType = "application/x-www-form-urlencoded;";
    req.ContentLength = bt.Length;  

    using (Stream reqStream = req.GetRequestStream())//using 使用可以释放using段内的内存
    {
        reqStream.Write(bt, , bt.Length);
        reqStream.Flush();
    }
    try
    {
        using (WebResponse res = req.GetResponse())
        {
            //在这里对接收到的页面内容进行处理   

            Stream resStream = res.GetResponseStream();  

            StreamReader resStreamReader = new StreamReader(resStream, System.Text.Encoding.UTF8);  

            string resLine;  

            System.Text.StringBuilder resStringBuilder = new System.Text.StringBuilder();  

            while ((resLine = resStreamReader.ReadLine()) != null)
            {
                resStringBuilder.Append(resLine + System.Environment.NewLine);
            }  

            resStream.Close();
            resStreamReader.Close();  

            return resStringBuilder.ToString();
        }
    }
    catch (Exception ex)
    {
        return ex.Message;//url错误时候回报错
    }
}
#endregion Post/Get提交调用抓取  

没了

没错，就是这么简单，只有这么点内容就已经完成了整个微信授权登录的事情

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转载请记得说明作者和出处哦-.-
作者：KingDuDu
原文出处：https://www.cnblogs.com/kingdudu/articles/8795928.html

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