C# wx获取token的基本方法

#region 请求Url，不发送数据/// <summary>/// 请求Url，不发送数据/// </summary>public static string 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>public static string RequestUrl(string url, string method){// 设置参数var request = WebRequest.Create(url) as HttpWebRequest;var 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var 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();var sr = new StreamReader(responseStream, Encoding.UTF8);//返回结果网页（html）代码string content = sr.ReadToEnd();return content;}#endregion #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 [] {'"', ' ', '/"'}); //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>public static bool TokenExpired(string access_token){string jsonStr =RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/menu/get?access_token={0}",access_token));if (GetJsonValue(jsonStr, "errcode") == "42001"){return true;}return false;}#endregion#region 获取Token/// <summary>/// 获取Token/// </summary>public static string GetToken(string appid, string secret){string strJson =RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}",appid, secret));return GetJsonValue(strJson, "access_token");}#endregion//获取Openidpublic static string GetOpenId(string appid, string secret, string code){string strJson =RequestUrl(string.Format("https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code",appid, secret, code));//LogUtil.WriteLog(strJson);return GetJsonValue(strJson, "openid");}