C#微信公众平台开发—access_token的获取存储与更新

                #region 请求Url，不发送数据
///<summary>/// 请求Url，不发送数据
///</summary>publicstaticstring RequestUrl(string url)
{
    return RequestUrl(url, "POST");
}
#endregion#region 请求Url，不发送数据
///<summary>/// 请求Url，不发送数据
///</summary>publicstaticstring RequestUrl(string url, string method)
{
    // 设置参数
    HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
    CookieContainer cookieContainer = new CookieContainer();
    request.CookieContainer = cookieContainer;
    request.AllowAutoRedirect = true;
    request.Method = method;
    request.ContentType = "text/html";
    request.Headers.Add("charset", "utf-8");

    //发送请求并获取相应回应数据
    HttpWebResponse response = request.GetResponse() as HttpWebResponse;
    //直到request.GetResponse()程序才开始向目标网页发送Post请求
    Stream responseStream = response.GetResponseStream();
    StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
    //返回结果网页（html）代码string content = sr.ReadToEnd();
    return content;
}
#endregion

                namespace
                 SWX.Utils
{
    
                ///
                <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>publicstaticstring 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(newchar[] { ‘"‘, ‘‘, ‘\‘‘ }); //过滤引号或空格                }
            }
            return result;
        }
        #endregion

    }
}

                #region 验证Token是否过期
///<summary>/// 验证Token是否过期
///</summary>publicstaticbool TokenExpired(string access_token)
{
    string jsonStr = HttpRequestUtil.RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/menu/get?access_token={0}", access_token));
    if (Tools.GetJsonValue(jsonStr, "errcode") == "42001")
    {
        returntrue;
    }
    returnfalse;
}
#endregion

                #region 获取Token
///<summary>/// 获取Token
///</summary>publicstaticstring GetToken(string appid, string secret)
{
    string strJson = HttpRequestUtil.RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, secret));
    return Tools.GetJsonValue(strJson, "access_token");
}
#endregion

                #region 获取access_token
///<summary>/// 获取access_token
///</summary>publicstaticstring GetAccessToken(PageBase page)
{
    string access_token = string.Empty;

    UserInfo user = GetLoginUser(page);
    if (user != null)
    {
        if (string.IsNullOrWhiteSpace(user.access_token)) //尚未保存过access_token        {
            access_token = WXApi.GetToken(user.AppID, user.AppSecret);
        }
        else
        {
            if (WXApi.TokenExpired(user.access_token)) //access_token过期            {
                access_token = WXApi.GetToken(user.AppID, user.AppSecret);
            }
            else
            {
                return user.access_token;
            }
        }

        MSSQLHelper.ExecuteSql(string.Format("update SWX_Config set access_token=‘{0}‘ where UserName=‘{1}‘", access_token, user.UserName));
    }

    return access_token;
}
#endregion