App_Code/Config.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web;
using Newtonsoft.Json;

/// <summary>
/// 微信公众号配置文件
/// </summary>
/// 
public class Config : System.Web.SessionState.IRequiresSessionState
{
    /// <summary>
    /// 开发者ID
    /// </summary>
    public static string AppId { get; set; }

    /// <summary>
    /// 开发者密码
    /// </summary>
    public static string AppSecret { get; set; }

    /// <summary>
    /// APP access_token 7200秒更新一次
    /// </summary>
    public static string access_token
    {
        get
        {
            try
            {
                if (HttpContext.Current.Session["$access_token"] == null)
                {
                    using (WebClient wc = new WebClient())
                    {
                        wc.Encoding = System.Text.Encoding.UTF8;
                        string ret = wc.DownloadString(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", Config.AppId, Config.AppSecret));
                        Dictionary<string, object> o = JsonConvert.DeserializeObject<Dictionary<string, object>>(ret);
                        if (o.ContainsKey("errmsg")) return o["errmsg"].ToString();
                        HttpContext.Current.Session.Add("$access_token", o["access_token"].ToString());
                        HttpContext.Current.Session.Timeout = 7200;
                        return o["access_token"].ToString();
                    }
                }
                return HttpContext.Current.Session["$access_token"].ToString();
            }
            catch
            {
                throw;
            }
        }
    }




}