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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.Xml;
using System.Web.Security;
using System.IO;
using System.Text;

namespace BigDataMedia.Web.WeiXin
{
    /// <summary>
    /// WeixinApi 测试所用，简单判断类型自动回复。
    /// </summary>

    //post请求
    public class WeixinApi : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            weixin wx = new weixin();
            String postStr = String.Empty;

            if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")
            {
                Stream s = HttpContext.Current.Request.InputStream;
                Byte[] b = new Byte[s.Length];
                s.Read(b, 0, (Int32)s.Length);
                postStr = Encoding.UTF8.GetString(b);

                if (!String.IsNullOrEmpty(postStr))
                {
                    wx.Handle(postStr);
                }
            }
            else
            {
                wx.Auth();
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
    //验证token
    public class weixin
    {
        private String Token = "";

        public void Auth()
        {
            String echoStr = HttpContext.Current.Request.QueryString["echoStr"];

            if (CheckSignature())
            {
                if (!String.IsNullOrEmpty(echoStr))
                {
                    HttpContext.Current.Response.Write(echoStr);
                    HttpContext.Current.Response.End();
                }
            }
        }

        //验证微信签名
        private bool CheckSignature()
        {
            String signature = HttpContext.Current.Request.QueryString["signature"];
            String timestamp = HttpContext.Current.Request.QueryString["timestamp"];
            String nonce = HttpContext.Current.Request.QueryString["nonce"];
            String[] ArrTmp = { Token, timestamp, nonce };

            Array.Sort(ArrTmp);
            String tmpStr = String.Join("", ArrTmp);

            tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
            tmpStr = tmpStr.ToLower();

            if (tmpStr == signature)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        //判断回复类型
        public void Handle(String postStr)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(postStr);

            XmlElement rootElement = doc.DocumentElement;
            XmlNode MsgType = rootElement.SelectSingleNode("MsgType");

            RequestXML requestXML = new RequestXML();
            requestXML.ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText;
            requestXML.FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText;
            requestXML.CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText;
            requestXML.MsgType = MsgType.InnerText;

            if (requestXML.MsgType == "text")
            {
                requestXML.Content = rootElement.SelectSingleNode("Content").InnerText;
            }

            else if (requestXML.MsgType == "location")
            {
                requestXML.Location_X = rootElement.SelectSingleNode("Location_X").InnerText;
                requestXML.Location_Y = rootElement.SelectSingleNode("Location_Y").InnerText;
                requestXML.Scale = rootElement.SelectSingleNode("Scale").InnerText;
                requestXML.MapInfo = rootElement.SelectSingleNode("Label").InnerText;
            }

            else if (requestXML.MsgType == "image")
            {
                requestXML.PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText;
            }

            ResponseMsg(requestXML);
        }



        /// <summary>
        /// 回复消息
        /// </summary>
        /// <param name="weixinXML"></param>
        private void ResponseMsg(RequestXML requestXML)
        {
            String responseContent = String.Empty;

            if (requestXML.MsgType == "text")
            {
                responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName, "已收到消息！");
            }
            else if (requestXML.MsgType == "location")
            {
                responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName, "已知道您的位置！");
            }
            else if (requestXML.MsgType == "image")
            {
                responseContent = FormatTextXML(requestXML.FromUserName, requestXML.ToUserName, "图片已接收！");
            }

            HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
            HttpContext.Current.Response.Write(responseContent);
        }

        //返回格式化文本XML内容
        private String FormatTextXML(String fromUserName, String toUserName, String content)
        {
            return "<xml><ToUserName><![CDATA["   fromUserName   "]]></ToUserName><FromUserName><![CDATA["   toUserName   "]]></FromUserName><CreateTime>"   ConvertDateTimeInt(DateTime.Now)   "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA["   content   "]]></Content><FuncFlag>1</FuncFlag></xml>";
        }

        private int ConvertDateTimeInt(System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (int)(time - startTime).TotalSeconds;
        }
    }


    //微信请求类
    public class RequestXML
    {
        private String toUserName = String.Empty;

        /// <summary>
        /// 公众号
        /// </summary>
        public String ToUserName
        {
            set;
            get;
        }

        private String fromUserName = "";

        /// <summary>
        /// 发送方微信号
        /// </summary>
        public String FromUserName
        {
            set;
            get;
        }

        private String createTime = String.Empty;

        /// <summary>
        /// 创建时间
        /// </summary>
        public String CreateTime
        {
            set;
            get;
        }

        private String msgType = String.Empty;

        /// <summary>
        /// 信息类型 地理位置:location,文本消息:text,消息类型:image
        /// </summary>
        public String MsgType
        {
            set;
            get;
        }

        private String content = String.Empty;

        /// <summary>
        /// 信息内容
        /// </summary>
        public String Content
        {
            set;
            get;
        }

        private String location_X = String.Empty;

        /// <summary>
        /// 地理位置纬度
        /// </summary>
        public String Location_X
        {
            set;
            get;
        }

        private String location_Y = String.Empty;

        /// <summary>
        /// 地理位置经度
        /// </summary>
        public String Location_Y
        {
            set;
            get;
        }

        private String scale = String.Empty;

        /// <summary>
        /// 地图缩放大小
        /// </summary>
        public String Scale
        {
            set;
            get;
        }

        private String mapInfo = String.Empty;

        /// <summary>
        /// 地理位置信息
        /// </summary>
        public String MapInfo
        {
            set;
            get;
        }

        private String picUrl = String.Empty;

        /// <summary>
        /// 图片链接
        /// </summary>
        public String PicUrl
        {
            set;
            get;
        }
    }

}