获取微信公众号Access_token最简单程序

protected string gettoken(string appID, string secret)
        {
            HttpWebRequest HttpWReq = (HttpWebRequest)WebRequest.Create("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+appID+"&"+"secret="+secret);
            HttpWebResponse HttpWResp = (HttpWebResponse)HttpWReq.GetResponse();
            // Insert code that uses the response object.
            StreamReader sr = new StreamReader(HttpWResp.GetResponseStream(), Encoding.UTF8);
            string res = sr.ReadToEnd();
            HttpWResp.Close();
            return res;
        }

注：要增加以下引用：

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