public void ProcessRequest(HttpContext context)

        {

            context.Response.ContentType = "text/plain";

            string postString = string.Empty;

            if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")

            {

                using (Stream stream = HttpContext.Current.Request.InputStream)

                {

                    Byte[] postBytes = new Byte[stream.Length];

                    stream.Read(postBytes, , (Int32)stream.Length);

                    postString = Encoding.UTF8.GetString(postBytes);

                    Handle(postString);

                }

            }

        }

        /// <summary>

        /// 处理信息并应答

        /// </summary>

        private void Handle(string postStr)

        {

            messageHelp help = new messageHelp();

            string responseContent = help.ReturnMessage(postStr);

            HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;

            HttpContext.Current.Response.Write(responseContent);

        }

public class messageHelp

    {

        public string ReturnMessage(string postStr)

        {

            string responseContent = "";

            XmlDocument xmldoc = new XmlDocument();

            xmldoc.Load(new System.IO.MemoryStream(System.Text.Encoding.GetEncoding("UTF-8").GetBytes(postStr)));

            XmlNode MsgType = xmldoc.SelectSingleNode("/xml/MsgType");

            if (MsgType != null)

            {

                switch (MsgType.InnerText)

                {

                    case "event":

                        responseContent = EventHandle(xmldoc);//事件处理

                        break;

                    case "text":

                        responseContent = TextHandle(xmldoc);//接受文本消息处理break;

                }

            }

            return responseContent;

        }

        //事件

        public string EventHandle(XmlDocument xmldoc)

        {

            string responseContent = "";

            XmlNode Event = xmldoc.SelectSingleNode("/xml/Event");

            XmlNode EventKey = xmldoc.SelectSingleNode("/xml/EventKey");

            XmlNode ToUserName = xmldoc.SelectSingleNode("/xml/ToUserName");

            XmlNode FromUserName = xmldoc.SelectSingleNode("/xml/FromUserName");

            if (Event != null)

            {

                //菜单单击事件

                if (Event.InnerText.Equals("CLICK"))

                {

                    Helper.GetUserDetail(Helper.IsExistAccess_Token(), FromUserName.InnerText);//获取用户基本信息

                    if (EventKey.InnerText.Equals(""))

                    {

                        responseContent = string.Format(ReplyType.Message_Text,

                            FromUserName.InnerText,

                            ToUserName.InnerText,

                            DateTime.Now.Ticks,

                            "欢迎查看工作动态");

                    }

                }

                else if (Event.InnerText.Equals("subscribe"))//关注公众号时推送消息

                {

                    Helper.GetUserDetail(Helper.IsExistAccess_Token(), FromUserName.InnerText);//获取用户基本信息

                    responseContent = string.Format(ReplyType.Message_Text,

                        FromUserName.InnerText,

                        ToUserName.InnerText,

                        DateTime.Now.Ticks,

                        "欢迎关注XX公司");

                }

            }

            return responseContent;

        }

        //接受文本消息

        public string TextHandle(XmlDocument xmldoc)

        {

            string responseContent = "";

            XmlNode ToUserName = xmldoc.SelectSingleNode("/xml/ToUserName");//接收方帐号（收到的OpenID）

            XmlNode FromUserName = xmldoc.SelectSingleNode("/xml/FromUserName");//开发者微信号

            XmlNode Content = xmldoc.SelectSingleNode("/xml/Content");

            if (Content != null)

            {

                responseContent = string.Format(ReplyType.Message_Text,

                   FromUserName.InnerText,

                    ToUserName.InnerText,

                    DateTime.Now.Ticks,

                    "欢迎使用微信公众号，如有任何疑问请联系我们客服人员！");

            }

            return responseContent;

        }

       //回复类型

    public class ReplyType

    {

        /// <summary>

        /// 普通文本消息

        /// </summary>

        public static string Message_Text

        {

            get

            {

                return @"<xml>

                            <ToUserName><![CDATA[{0}]]></ToUserName>

                            <FromUserName><![CDATA[{1}]]></FromUserName>

                            <CreateTime>{2}</CreateTime>

                            <MsgType><![CDATA[text]]></MsgType>

                            <Content><![CDATA[{3}]]></Content>

                            </xml>";

            }

        }

    }