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   源码介绍

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主要实现了微信服务器与外站数据交换功能。

using System;
using System.Collections.Generic;
using System.Web;
using System.IO;
using System.Text;
using System.Web.Security;
using System.Xml;
using System.Reflection;
using WeiXin.Models;

namespace WeiXinService
{
    /// <summary>
    /// 微信数据处理
    /// </summary>
    public class interfaceTest : IHttpHandler
    {
        log4net.ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);//自获取出错的类
        public void ProcessRequest(HttpContext param_context)
        {
            try
            {                
                string postString = string.Empty;
                //用户发送消息或点击等事件一般都是POST过来，微信服务器向接口发送POST请求，根据请求我们进行处理反馈
                if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")
                {
                    using (Stream stream = HttpContext.Current.Request.InputStream)
                    {
                        Byte[] postBytes = new Byte[stream.Length];
                        stream.Read(postBytes, 0, (Int32)stream.Length);
                        postString = Encoding.UTF8.GetString(postBytes);
                        Handle(postString);
                    }
                }
                else
                {
                    //第一次配置接口地址的时候，微信服务器会向接口发送一个GET请求来验证你的接口地址
                    InterfaceTest();
                }
            }
            catch (Exception ex)
            {
                log.Error(ex);
            }
        }

        /// <summary>
        /// 接收微信发送的XML消息并且解析
        /// </summary>
        private void ReceiveXml()
        {
            Stream requestStream = System.Web.HttpContext.Current.Request.InputStream;
            byte[] requestByte = new byte[requestStream.Length];
            requestStream.Read(requestByte, 0, (int)requestStream.Length);
            string requestStr = Encoding.UTF8.GetString(requestByte);

            if (!string.IsNullOrEmpty(requestStr))
            {
                //封装请求类
                XmlDocument requestDocXml = new XmlDocument();
                requestDocXml.LoadXml(requestStr);
                XmlElement rootElement = requestDocXml.DocumentElement;
                WxXmlModel WxXmlModel = new WxXmlModel();
                WxXmlModel.ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText;
                WxXmlModel.FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText;
                WxXmlModel.CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText;
                WxXmlModel.MsgType = rootElement.SelectSingleNode("MsgType").InnerText;
                switch (WxXmlModel.MsgType)
                {
                    case "text"://文本
                        WxXmlModel.Content = rootElement.SelectSingleNode("Content").InnerText;
                        break;
                    case "image"://图片
                        WxXmlModel.PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText;
                        break;
                    case "event"://事件
                        WxXmlModel.Event = rootElement.SelectSingleNode("Event").InnerText;
                        if (WxXmlModel.Event == "subscribe")//关注类型
                        {
                            WxXmlModel.EventKey = rootElement.SelectSingleNode("EventKey").InnerText;
                        }
                        break;
                    default:
                        break;
                }
               // ResponseXML(WxXmlModel);//回复消息
            }
        }



        /// <summary>
        /// 处理信息并应答
        /// </summary>
        private void Handle(string postStr)
        {
            messageHelp help = new messageHelp();
            string responseContent = help.ReturnMessage(postStr);
            log.Info("接收用户："   postStr   "返回："   responseContent);
            HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
            HttpContext.Current.Response.Write(responseContent);
        }

        /// <summary>
        /// 成为开发者url测试，返回echoStr
        /// </summary>
        public void InterfaceTest()
        {
            string token = "token";
            if (string.IsNullOrEmpty(token))
            {
                return;
            }

            //微信服务器会将下面几个参数发送到接口，接口这边返回接收到的echoStr就说明验证通过，
            //主要为了防止别人盗用你的接口，我这边没做逻辑判断直接返回接收到的echoStr来通过验证
            string echoString = HttpContext.Current.Request.QueryString["echoStr"];
            string signature = HttpContext.Current.Request.QueryString["signature"];
            string timestamp = HttpContext.Current.Request.QueryString["timestamp"];
            string nonce = HttpContext.Current.Request.QueryString["nonce"];
            log.Info("第一次配置接口:  echoString:"   echoString   ",signature:"   signature   ",timestamp:"   timestamp   ",nonce:"   nonce);

            if (!string.IsNullOrEmpty(echoString))
            {
                HttpContext.Current.Response.Write(echoString);
                HttpContext.Current.Response.End();
            }
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}