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   源码介绍

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//******************************************************************************
//文 件 名： WXAccessToken
//版权所有： 蓝思创工作室
//创 建 人： 蓝思创
//创建日期： 2016-05-08
//网    址：https://shop112893715.taobao.com/
//功能描述：获取AccessToken

//--------------------------------------------------------------------------------
//修改人：
//修改原因：
//修改日期:
//          更多源码下载，请访问   https://shop112893715.taobao.com/
//******************************************************************************


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Net;
using System.IO;
using System.Text;

public partial class WXAccessToken : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void BtnGet_Click(object sender, EventArgs e)
    {
        string AccessTokenJson = string.Empty;
        TextBoxAccessToken.Text = GetAccessToken(out AccessTokenJson);
        TextBoxJson.Text = AccessTokenJson;
    }


    #region 获取AccessToken
    /// <summary>
    /// 获取AccessToken
    /// </summary>
    /// <param name="corpid">企业Id</param>
    /// <param name="corpsecret">管理组的凭证密钥</param>
    /// <returns></returns>
    private static string GetAccessToken(out string AccessTokenJson)
    {
        //过期时间为7200秒 120分钟
        string token = string.Empty;
        //session保存
        if (System.Web.HttpContext.Current.Session["AccessToken"] == null)
        {

            string corpId = ConfigurationManager.AppSettings["CorpId"];//从配置文件获取corpId
            string corpsecret = ConfigurationManager.AppSettings["Secret"];//从配置文件获取corpId

            string Gurl = string.Format("https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid={0}&corpsecret={1}", corpId, corpsecret);
            AccessTokenJson = HttpGet(Gurl, "");

            string regex = "\"access_token\":\"(?<token>.*?)\"";
            token = CRegex.GetText(AccessTokenJson, regex, "token");

            System.Web.HttpContext.Current.Session["AccessTokenJson"] = AccessTokenJson; 
            System.Web.HttpContext.Current.Session["AccessToken"] = token;
            System.Web.HttpContext.Current.Session.Timeout = 7200;
        }
        else
        {
            AccessTokenJson = System.Web.HttpContext.Current.Session["AccessTokenJson"].ToString();
            token = System.Web.HttpContext.Current.Session["AccessToken"].ToString();

        }

        return token;

    }
    #endregion


    #region GET请求与获取结果
    /// <summary>
    /// GET请求与获取结果
    /// </summary>
    private static string HttpGet(string Url, string postDataStr)
    {
        HttpWebRequest request;
        if (string.IsNullOrEmpty(postDataStr))
        {
            request = (HttpWebRequest)WebRequest.Create(Url);
        }
        else
        {
            request = (HttpWebRequest)WebRequest.Create(Url   (postDataStr == "" ? "" : "?")   postDataStr);
        }

        request.Method = "GET";
        request.ContentType = "text/html;charset=UTF-8";

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        Stream myResponseStream = response.GetResponseStream();
        StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
        string retString = myStreamReader.ReadToEnd();
        myStreamReader.Close();
        myResponseStream.Close();

        return retString;
    }
    #endregion


}