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   源码介绍

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private string getJsApiTicket()
        {
            // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例  
            string path = HttpContext.Current.Server.MapPath(@"/jssdk/jsapi_ticket.json");
            //读取文件         
            FileStream file = new FileStream(path, FileMode.Open);
            var serializer = new DataContractJsonSerializer(typeof(JSTicket));
            JSTicket readJSTicket = new JSTicket();
           // JSTicket readJSTicket = (JSTicket)serializer.ReadObject(file);



            file.Close();
            string ticket = "";
            if (readJSTicket.expire_time < ConvertDateTimeInt(DateTime.Now))
            {
                string accessToken = getAccessToken();
                string url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token="   accessToken   "";
                Jsapi api = Desrialize<Jsapi>(new Jsapi(), httpGet(url));
                ticket = api.ticket;
                if (ticket != "")
                {
                    readJSTicket.expire_time = ConvertDateTimeInt(DateTime.Now)   7000;
                    readJSTicket.jsapi_ticket = ticket;


                    string json = Serialize<JSTicket>(readJSTicket);
                    StreamWriterMetod(json, path);
                }
            }
            else
            {
                ticket = readJSTicket.jsapi_ticket;
            }


            return ticket;
        }