MVC微信网页授权获取用户OpenId

2020-04-24 21:07:40

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最近开发微信公众平台，做下记录，以前也开发过，这次开发又给忘了，搞了半天，还是做个笔记为好。

注意框架为MVC 开发微信公众平台。场景为，在模板页中获取用户openid，想要进行验证的页面，集成模板页就可以了。

在_Layout.cshtml中加入如下代码

<head>  <meta charset="utf-8" />  <meta name="viewport" content="width=device-width, initial-scale=1.0">  <title>@ViewBag.Title - My ASP.NET Application</title>  @Styles.Render("~/Content/css")  @Scripts.Render("~/bundles/modernizr")  @{    var code = HttpContext.Current.Request["code"];    Log.logmsg(code);    string urlpath = HttpContext.Current.Request.Url.AbsoluteUri.ToString();    ViewBag.at = AdminUtil.GetOpenID(urlpath, code);  }</head>

类AdminUtil中加入GetOpenID方法

#region 获取OpenID    /// <summary>    /// 获取OpenID    /// </summary>    public static string GetOpenID(string redirect_url, string code)    {      string AppID = WXModel.AppID;      string AppSecret = WXModel.AppSecret;      string openid = "";      openid = WXApi.GetOpenID(AppID, redirect_url, code, AppSecret);      return openid;    }    #endregion

类WXApi中加入GetOpenID方法

 #region 获取OpenId    /// <summary>    /// 获取OpenId    /// </summary>    public static string GetOpenID(string appid, string redirect_url, string code, string screct)    {      string strJson = "";      if (string.IsNullOrEmpty(code))      {        redirect_url = HttpUtility.UrlEncode(redirect_url);        HttpContext.Current.Response.Redirect(string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_base&state={2}#wechat_redirect",          appid, redirect_url, new Random().Next(1000, 200000).ToString()));      }      else      {        strJson = HttpRequestUtil.RequestUrl(string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code",        appid, screct, code));      }      return Tools.GetJsonValue(strJson, "openid");    }    #endregion

public static class WXModel  {    public static string access_token;    public static string AppID;    public static string AppSecret;  }

 /// <summary>  /// 工具类  /// </summary>  public class Tools  {    #region 获取Json字符串某节点的值    /// <summary>    /// 获取Json字符串某节点的值    /// </summary>    public static string GetJsonValue(string jsonStr, string key)    {      string result = string.Empty;      if (!string.IsNullOrEmpty(jsonStr))      {        key = "/"" + key.Trim('"') + "/"";        int index = jsonStr.IndexOf(key) + key.Length + 1;        if (index > key.Length + 1)        {          //先截逗号，若是最后一个，截“｝”号，取最小值          int end = jsonStr.IndexOf(',', index);          if (end == -1)          {            end = jsonStr.IndexOf('}', index);          }          result = jsonStr.Substring(index, end - index);          result = result.Trim(new char[] { '"', ' ', '/'' }); //过滤引号或空格        }      }      return result;    }    #endregion  }

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