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   源码介绍

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

public partial class SendMessage : System.Web.UI.Page
{
    string MyOpenID;
    string MyContent;
    protected void Page_Load(object sender, EventArgs e)
    {
        MyOpenID = "oV93gjl5slD3p29yS1dOijy-pqZ8";
        MyContent = "这是一个客服消息";
        UserName.Text = MyOpenID;
        Content.Text = MyContent;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string res = "";
        string Access_Token = IsExistAccess_Token();
       
        string posturl = "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token="   Access_Token;
        string postData = "{\"touser\":\""   UserName.Text   "\",\"msgtype\":\"text\",\"text\":{\"content\":\""   Content.Text   "\"}}";
        res = GetPage(posturl, postData);
        
        Response.Write(res);
    }

    public string GetPage(string posturl, string postData)
    {
        Stream outstream = null;
        Stream instream = null;
        StreamReader sr = null;
        HttpWebResponse response = null;
        HttpWebRequest request = null;
        Encoding encoding = Encoding.UTF8;
        byte[] data = encoding.GetBytes(postData);
        // 准备请求...
        try
        {
            // 设置参数
            request = WebRequest.Create(posturl) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;
            outstream = request.GetRequestStream();
            outstream.Write(data, 0, data.Length);
            outstream.Close();
            //发送请求并获取相应回应数据
            response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求
            instream = response.GetResponseStream();
            sr = new StreamReader(instream, encoding);
            //返回结果网页（html）代码
            string content = sr.ReadToEnd();
            string err = string.Empty;
            return content;
        }
        catch (Exception ex)
        {
            string err = ex.Message;
            Response.Write(err);
            return string.Empty;
        }
    }

    /// <summary>
    /// 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
    /// </summary>
    /// <param name="datetime"></param>
    /// <returns></returns>
    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 = HttpContext.Current.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;
    }



    public static Access_token GetAccess_token()
    {
        string appid = "XXXXXXXXXXX";
        string secret = "XXXXXXXXXXXX";
        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<Access_token>(content);
            mode.access_token = token.access_token;
            mode.expires_in = token.expires_in;
        }
        return mode;
    }
 
}