C# 响应微信发送的Token验证，文字、图文自动回复、请求客服对话.....

代码如下，有需要的可以参考：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using System.Data;
 using System.IO;
 using System.Net;
 using System.Text;
 using System.Xml;
 using System.Web.Security;
 using Newtonsoft.Json.Linq;
 using System.Net.Security;

 namespace SY.Web.weixinApp
 {
     public partial class Token_url : System.Web.UI.Page
     {
         protected string Token = "";//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, , (int)s.Length);

                 postStr = System.Text.Encoding.UTF8.GetString(b);
                 string _resStr = "";

                 if (!string.IsNullOrEmpty(postStr))
                 {
                     _resStr = ResponseMsg(postStr);
                     WriteFileLog(postStr);
                 }
                 Response.Write(_resStr);
                 Response.End();
             }

             else
             {
                 Valid();   //正确响应微信发送的Token验证
             }

         }

         /// <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;
             }
         }

         //正确响应微信发送的Token验证
         private void Valid()
         {

             string echoStr = Request.QueryString["echoStr"].ToString();

             if (CheckSignature())
             {
                 if (!string.IsNullOrEmpty(echoStr))
                 {
                     Response.Write(echoStr);
                     Response.End();
                 }
             }

         }

         /// <summary>
         /// 返回信息结果(微信信息返回)
         /// </summary>
         /// <param name="weixinXML"></param>
         private string ResponseMsg(string weixinXML)
         {
             XmlDocument xx = new XmlDocument();
             xx.LoadXml(weixinXML);

             XmlNode root = xx.SelectSingleNode("xml");

             XmlNode _ToName = root.SelectSingleNode("ToUserName");
             XmlNode _FromName = root.SelectSingleNode("FromUserName");
             XmlNode _CreatTime = root.SelectSingleNode("CreateTime");
             XmlNode _MsgType = root.SelectSingleNode("MsgType");

             #region Click/View 事件处理
             if (_MsgType.InnerText == "event")
             {
                 XmlNode _Event = root.SelectSingleNode("Event");
                 XmlNode _EventKey = root.SelectSingleNode("EventKey");
                 if (_Event.InnerText == "subscribe")
                 {
                     //关注后返回信息代码
                     _returnStr = "<xml><ToUserName><![CDATA[" + _FromName.InnerText + "]]></ToUserName><FromUserName><![CDATA[" + _ToName.InnerText + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[欢迎关注！]]></Content></xml>";

                     return _returnStr;

                 }

                 #region  click事件
                 if (_Event.InnerText == "CLICK")
                 {

                     //请求和客服对话，关键词：rgfw
                     if (_EventKey.InnerText == "rgfw")
                     {
                         //文字信息
                         _returnStr = "<xml><ToUserName><![CDATA[" + _FromName.InnerText + "]]></ToUserName><FromUserName><![CDATA[" + _ToName.InnerText + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[transfer_customer_service]]></MsgType></xml>";
                         return _returnStr;
                     }
                     else
                     {
                         //关键词：piclist自动回复图文信息
                         if (_EventKey.InnerText == "piclist")
                         {
                             DataTable dt = new DataTable();
                             dt = dal.GetList(, "CID=525", "ID desc");   //获取需要回复的图文信息列表
                             StringBuilder sbpic = new StringBuilder();
                             if (dt != null && dt.Rows.Count > )
                             {
                                 sbpic.Append("<xml>");
                                 sbpic.AppendFormat("<ToUserName><![CDATA[{0}]]></ToUserName>", _FromName.InnerText);
                                 sbpic.AppendFormat("<FromUserName><![CDATA[{0}]]></FromUserName>", _ToName.InnerText);
                                 sbpic.AppendFormat("<CreateTime><![CDATA[{0}]]></CreateTime>", ConvertDateTimeInt(DateTime.Now));
                                 sbpic.AppendFormat("<MsgType><![CDATA[{0}]]></MsgType>", "news");
                                 sbpic.AppendFormat("<ArticleCount><![CDATA[{0}]]></ArticleCount>", dt.Rows.Count);
                                 sbpic.Append("<Articles>");
                                 foreach (DataRow dr in dt.Rows)
                                 {
                                     sbpic.Append("<item>");
                                     sbpic.AppendFormat("<Title><![CDATA[{0}]]></Title>", dr["Title"]);  //标题
                                     sbpic.AppendFormat("<Description><![CDATA[{0}]]></Description>", dr["Des"]);  //导读
                                     sbpic.AppendFormat("<PicUrl><![CDATA[{0}]]></PicUrl>", "http://www.xxx.com/" + dr["Pic"]);  //图片地址url
                                     sbpic.AppendFormat("<Url><![CDATA[{0}]]></Url>", "http://www.xxx.com/test.aspx?id=" + dr["ID"]);   //原文链接
                                     sbpic.Append("</item>");
                                 }

                                 sbpic.Append("</Articles></xml>");

                                 _returnStr = sbpic.ToString();
                                 return _returnStr;
                             }
                         }

                     }
                 }
                 #endregion

             }
             #endregion

             #region View事件   关键词自动回复文字或图片信息处理
             if (_MsgType.InnerText == "text")
             {
                 XmlNode _Content = root.SelectSingleNode("Content");

                 //关键词：rgfw请求和客服对话，
                 if (!string.IsNullOrEmpty(_Content.InnerText) && _Content.InnerText == "rgfw")
                 {
                     _returnStr = "<xml><ToUserName><![CDATA[" + _FromName.InnerText + "]]></ToUserName><FromUserName><![CDATA[" + _ToName.InnerText + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[transfer_customer_service]]></MsgType></xml>";
                     return _returnStr;
                 }
                 else
                 {
                     //文字信息
                     _returnStr = "<xml><ToUserName><![CDATA[" + _FromName.InnerText + "]]></ToUserName><FromUserName><![CDATA[" + _ToName.InnerText + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[文字信息]]></Content></xml>";
                     return _returnStr;
                 }

             }
             #endregion

             return _returnStr;
         }

         /// <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(, , ));
             long lTime = long.Parse(timeStamp + "");
             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(, , ));
             return (int)(time - startTime).TotalSeconds;
         }

         /// <summary>
         /// 写入文件日志
         /// </summary>
         /// <param name="strMemo"></param>
         private void WriteFileLog(string strMemo)
         {
             string _filepath = Server.MapPath("/logs");
             string _filename = Server.MapPath("/logs/logs.log");

             if (!Directory.Exists(_filepath))
             {
                 Directory.CreateDirectory(_filepath);
                 if (!File.Exists(_filename))
                 {
                     FileStream fs1 = File.Create(_filename);
                     fs1.Close();
                     fs1.Dispose();
                 }
             }

             //将文件信息读入流中
             using (FileStream fs = new FileStream(_filename, FileMode.OpenOrCreate | FileMode.Append))
             {
                 lock (fs)//锁住流
                 {
                     //if (!fs.CanWrite)
                     //{
                     //    throw new System.Security.SecurityException("文件fileName=" + _filename + "是只读文件不能写入!");
                     //}

                     StreamWriter sw = new StreamWriter(fs);
                     sw.WriteLine(strMemo);
                     sw.Dispose();
                     sw.Close();
                 }
             }

         }

     }
 }