.Net WeChat 開発における access_token の有効期限の問題を解決する方法

/// 
 ///Access_token 的摘要说明 /// 
 public class Access_token { public Access_token() { // //TODO: 在此处添加构造函数逻辑 // } string _access_token; string _expires_in; /// 
 /// 获取到的凭证 /// 
 public string access_token { get { return _access_token; } set { _access_token = value; } } /// 
 /// 凭证有效时间，单位：秒 /// 
 public string expires_in { get { return _expires_in; } set { _expires_in = value; } } }

  初始值可以随便写 1980/12/12 16:06:38 

public static Access_token GetAccess_token() { string appid = 你的appid ; string secret = 你的secret; string strUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + secret; Access_token mode = new Access_token(); HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(strUrl); req.Method = "GET"; using (WebResponse wr = req.GetResponse()) { HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse(); StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8); string content = reader.ReadToEnd(); //Response.Write(content); //在这里对Access_token 赋值 Access_token token = new Access_token(); token = JsonHelper.ParseFromJson(content); mode.access_token = token.access_token; mode.expires_in = token.expires_in; } return mode; }

using System; using System.IO; using System.Text; using System.Runtime.Serialization.Json; public class JsonHelper { /// 
 /// 生成Json格式 /// 
 ///  ///  ///  public static string GetJson(T obj) { DataContractJsonSerializer json = new DataContractJsonSerializer(obj.GetType()); using (MemoryStream stream = new MemoryStream()) { json.WriteObject(stream, obj); string szJson = Encoding.UTF8.GetString(stream.ToArray()); return szJson; } } /// 
 /// 获取Json的Model /// 
 ///  ///  ///  public static T ParseFromJson(string szJson) { T obj = Activator.CreateInstance(); using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(szJson))) { DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType()); return (T)serializer.ReadObject(ms); } } }

/// 
 /// 根据当前日期 判断Access_Token 是否超期 如果超期返回新的Access_Token 否则返回之前的Access_Token /// 
 ///  ///  public static string IsExistAccess_Token() { string Token = string.Empty; DateTime YouXRQ; // 读取XML文件中的数据，并显示出来 ，注意文件路径 string filepath = Server.MapPath("XMLFile.xml"); StreamReader str = new StreamReader(filepath, System.Text.Encoding.UTF8); XmlDocument xml = new XmlDocument(); xml.Load(str); str.Close(); str.Dispose(); Token = xml.SelectSingleNode("xml").SelectSingleNode("Access_Token").InnerText; YouXRQ = Convert.ToDateTime(xml.SelectSingleNode("xml").SelectSingleNode("Access_YouXRQ").InnerText); if (DateTime.Now > YouXRQ) { DateTime _youxrq = DateTime.Now; Access_token mode = GetAccess_token(); xml.SelectSingleNode("xml").SelectSingleNode("Access_Token").InnerText = mode.access_token; _youxrq = _youxrq.AddSeconds(int.Parse(mode.expires_in)); xml.SelectSingleNode("xml").SelectSingleNode("Access_YouXRQ").InnerText = _youxrq.ToString(); xml.Save(filepath); Token = mode.access_token; } return Token; }