微信公众号服务 - 简单demo（C#）

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

public partial class wx : System.Web.UI.Page
{
    const string Token = "mrlenon";//你的token

    protected void Page_Load(object sender, EventArgs e)
    {
        string postStr = "";
        if (Request.HttpMethod.ToLower() == "post")
        {
            System.IO.Stream s = System.Web.HttpContext.Current.Request.InputStream;
            byte[] b = new byte[s.Length];
            s.Read(b, 0, (int)s.Length);
            postStr = System.Text.Encoding.UTF8.GetString(b);
            if (!string.IsNullOrEmpty(postStr))
            {
                //ResponseMsg(postStr);
                Response.Write(ResponseMsg(postStr));
                Response.End();
            }
            //WriteLog("postStr:" + postStr);
        }
        else
        {
            Valid();
        }
    }

    /// <summary>
    /// 验证微信签名
    /// </summary>
    /// * 将token、timestamp、nonce三个参数进行字典序排序
    /// * 将三个参数字符串拼接成一个字符串进行sha1加密
    /// * 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。
    /// <returns></returns>
    private bool CheckSignature()
    {
        string signature = Request.QueryString["signature"].ToString();
        string timestamp = Request.QueryString["timestamp"].ToString();
        string nonce = Request.QueryString["nonce"].ToString();
        string[] ArrTmp = { Token, timestamp, nonce };
        Array.Sort(ArrTmp);     //字典排序
        string tmpStr = string.Join("", ArrTmp);
        tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
        tmpStr = tmpStr.ToLower();
        if (tmpStr == signature)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    private void Valid()
    {
        string echoStr = Request.QueryString["echoStr"].ToString();
        if (CheckSignature())
        {
            if (!string.IsNullOrEmpty(echoStr))
            {
                Response.Write(echoStr);
                Response.End();
            }
        }
    }

    /// <summary>
    /// 返回微信POST过来的结果(微信信息返回)
    /// </summary>
    /// <param name="weixinXML">微信服务器post过来的数据</param>
    private string ResponseMsg(string weixinXML)
    {
        Hashtable ht = GetXmlName(weixinXML);

        //这里写你的返回信息代码
        StringBuilder sb = new StringBuilder();
        sb.Append("<xml>");
        sb.Append("<ToUserName><![CDATA[" + ht["FromUserName"].ToString() + "]]></ToUserName>");
        sb.Append("<FromUserName><![CDATA[" + ht["ToUserName"].ToString() + "]]></FromUserName>");
        sb.Append("<CreateTime>" + ht["CreateTime"].ToString() + "</CreateTime>");

        sb.Append("<MsgType><![CDATA[" + ht["MsgType"].ToString() + "]]></MsgType>");
        sb.Append("<Content><![CDATA[" + ht["Content"].ToString() + "]]></Content>");

        //switch (ht["MsgType"].ToString())
        //{
        //    case "text":
        //        sb.Append("<MsgType><![CDATA[" + ht["MsgType"].ToString() + "]]></MsgType>");
        //        sb.Append("<Content><![CDATA[" + ht["Content"].ToString() + "]]></Content>");
        //        break;
        //    case "image":
        //        sb.Append("<MsgType><![CDATA[" + ht["MsgType"].ToString() + "]]></MsgType>");
        //        sb.Append("<Content><![CDATA[亲，目前还没有做图片消息处理的功能哦！]]></Content>");
        //        sb.Append("<Image>");
        //        sb.Append("<MediaId><![CDATA[" + ht["MediaId"].ToString() + "]]></MediaId>");
        //        sb.Append("</Image>");
        //        break;
        //    case "voice":
        //        sb.Append("<Content><![CDATA[亲，目前还没有做语音消息处理的功能哦！]]></Content>");
        //        break;
        //    case "video":
        //        sb.Append("<Content><![CDATA[亲，目前还没有做视频消息处理的功能哦！]]></Content>");
        //        break;
        //    case "location":
        //        sb.Append("<Content><![CDATA[亲，目前还没有做地理位置处理的功能哦！]]></Content>");
        //        break;
        //    case "link":
        //        sb.Append("<Content><![CDATA[亲，目前还没有做链接消息处理的功能哦！]]></Content>");
        //        break;
        //}

        sb.Append("</xml>");
        return sb.ToString();
    }

    /// <summary>
    /// unix时间转换为datetime
    /// </summary>
    /// <param name="timeStamp"></param>
    /// <returns></returns>
    private DateTime UnixTimeToTime(string timeStamp)
    {
        DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
        long lTime = long.Parse(timeStamp + "0000000");
        TimeSpan toNow = new TimeSpan(lTime);
        return dtStart.Add(toNow);
    }

    /// <summary>
    /// datetime转换为unixtime
    /// </summary>
    /// <param name="time"></param>
    /// <returns></returns>
    private int ConvertDateTimeInt(System.DateTime time)
    {
        System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
        return (int)(time - startTime).TotalSeconds;
    }

    /// <summary>
    /// 写日志(用于跟踪)
    /// </summary>
    private void WriteLog(string strMemo)
    {
        string filename = Server.MapPath("/logs/log.txt");
        if (!Directory.Exists(Server.MapPath("//logs//")))
            Directory.CreateDirectory("//logs//");
        StreamWriter sr = null;
        try
        {
            if (!File.Exists(filename))
            {
                sr = File.CreateText(filename);
            }
            else
            {
                sr = File.AppendText(filename);
            }
            sr.WriteLine(strMemo);
        }
        catch
        {

        }
        finally
        {
            if (sr != null)
                sr.Close();
        }
    }

    /// <summary>
    /// 解析post过来的数据
    /// </summary>
    /// <param name="xmlStr"></param>
    /// <returns></returns>
    private Hashtable GetXmlName(string xmlStr)
    {
        Hashtable ht = new Hashtable(); //创建一个Hashtable实例

        XmlDocument xx = new XmlDocument();
        xx.LoadXml(xmlStr);//加载xml

        //开发者微信号
        XmlNodeList toList = xx.GetElementsByTagName("ToUserName"); //取得节点名为ToUserName的XmlNode集合
        XmlNode toNode = toList[0];
        string toName = toNode.InnerText;

        //发送方帐号（一个OpenID）
        XmlNodeList fromList = xx.GetElementsByTagName("FromUserName"); //取得节点名为FromUserName的XmlNode集合
        XmlNode fromNode = fromList[0];
        string fromName = fromNode.InnerText;

        //消息创建时间 （整型）
        XmlNodeList createTimeList = xx.GetElementsByTagName("CreateTime"); //取得节点名为CreateTime的XmlNode集合
        XmlNode createTimeNode = createTimeList[0];
        string createTimeName = createTimeNode.InnerText;

        //消息类型 text/image/voice/video/location/link
        XmlNodeList msgTypeList = xx.GetElementsByTagName("MsgType"); //取得节点名为MsgType的XmlNode集合
        XmlNode msgTypeNode = msgTypeList[0];
        string msgTypeName = msgTypeNode.InnerText;

        //文本消息内容
        XmlNodeList contentList = xx.GetElementsByTagName("Content"); //取得节点名为CreateTime的XmlNode集合
        XmlNode contentNode = contentList[0];
        string contentName = contentNode.InnerText;

        //图片链接
        XmlNodeList picUrlList = xx.GetElementsByTagName("PicUrl"); //取得节点名为PicUrl的XmlNode集合
        XmlNode picUrlNode = picUrlList[0];
        string picUrlName = picUrlNode.InnerText;

        //图片消息媒体id，可以调用多媒体文件下载接口拉取数据。
        XmlNodeList mediaIdList = xx.GetElementsByTagName("MediaId"); //取得节点名为PicUrl的XmlNode集合
        XmlNode mediaIdNode = mediaIdList[0];
        string mediaIdName = mediaIdNode.InnerText;

        //消息id，64位整型
        XmlNodeList msgIdList = xx.GetElementsByTagName("MsgId"); //取得节点名为MsgId的XmlNode集合
        XmlNode msgIdNode = msgIdList[0];
        string msgIdName = msgIdNode.InnerText;

        ht.Add("ToUserName", toName);
        ht.Add("FromUserName", fromName);
        ht.Add("CreateTime", createTimeName);
        ht.Add("MsgType", msgTypeName);
        ht.Add("Content", contentName);
        //ht.Add("PicUrl", picUrlName);
        //ht.Add("MediaId", mediaIdName);
        //ht.Add("MsgId", msgIdName);

        return ht;
    }
}