asp.net微信公众平台开发

http://mp.weixin.qq.com/wiki/index.php?title=%E6%B6%88%E6%81%AF%E6%8E%A5%E5%8F%A3%E6%8C%87%E5%8D%97 

微信公众平台接口指南

微信公众平台的开发比较简单，首先是网址接入

公众平台用户提交信息后，微信服务器将发送GET请求到填写的URL上，并且带上四个参数：

参数	描述
signature	微信加密签名
timestamp	时间戳
nonce	随机数
echostr	随机字符串

开发者通过检验signature对请求进行校验（下面有校验方式）。若确认此次GET请求来自微信服务器，请原样返回echostr参数内容，则接入生效，否则接入失败。

signature结合了开发者填写的token参数和请求中的timestamp参数、nonce参数。

加密/校验流程：
1. 将token、timestamp、nonce三个参数进行字典序排序
2. 将三个参数字符串拼接成一个字符串进行sha1加密
3. 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

/// <summary>
 /// 验证签名
 /// </summary>
 /// <param name="signature"></param>
 /// <param name="timestamp"></param>
 /// <param name="nonce"></param>
 /// <returns></returns>
 public static bool CheckSignature(String signature, String timestamp, String nonce)
 {
     String[] arr = new String[] { token, timestamp, nonce };
     // 将token、timestamp、nonce三个参数进行字典序排序
     Array.Sort<String>(arr);

     StringBuilder content = new StringBuilder();
     for (int i = 0; i < arr.Length; i++)
     {
         content.Append(arr[i]);
     }

     String tmpStr = SHA1_Encrypt(content.ToString());


     // 将sha1加密后的字符串可与signature对比，标识该请求来源于微信
     return tmpStr != null ? tmpStr.Equals(signature) : false;
 }


 /// <summary>
 /// 使用缺省密钥给字符串加密
 /// </summary>
 /// <param name="Source_String"></param>
 /// <returns></returns>
 public static string SHA1_Encrypt(string Source_String)
 {
     byte[] StrRes = Encoding.Default.GetBytes(Source_String);
     HashAlgorithm iSHA = new SHA1CryptoServiceProvider();
     StrRes = iSHA.ComputeHash(StrRes);
     StringBuilder EnText = new StringBuilder();
     foreach (byte iByte in StrRes)
     {
         EnText.AppendFormat("{0:x2}", iByte);
     }
     return EnText.ToString();
 }

接入后是消息推送当普通微信用户向公众账号发消息时，微信服务器将POST该消息到填写的URL上。

    protected void Page_Load(object sender, EventArgs e)
    {

        if (Request.HttpMethod.ToUpper() == "GET")
        {
            // 微信加密签名
            string signature = Request.QueryString["signature"];
            // 时间戳
            string timestamp = Request.QueryString["timestamp"];
            // 随机数
            string nonce = Request.QueryString["nonce"];
            // 随机字符串
            string echostr = Request.QueryString["echostr"];
            if (WeixinServer.CheckSignature(signature, timestamp, nonce))
            {
                Response.Write(echostr);
            }

        }
        else if (Request.HttpMethod.ToUpper() == "POST")
        {

           StreamReader stream = new StreamReader(Request.InputStream);
           string xml = stream.ReadToEnd();

           processRequest(xml);
        }


    }


    /// <summary>
    /// 处理微信发来的请求
    /// </summary>
    /// <param name="xml"></param>
    public void processRequest(String xml)
    {
        try
        {

            // xml请求解析
            Hashtable requestHT = WeixinServer.ParseXml(xml);

            // 发送方帐号（open_id）
            string fromUserName = (string)requestHT["FromUserName"];
            // 公众帐号
            string toUserName = (string)requestHT["ToUserName"];
            // 消息类型
            string msgType = (string)requestHT["MsgType"];

            //文字消息
            if (msgType == ReqMsgType.Text)
            {
               // Response.Write(str);

               string content = (string)requestHT["Content"];
                if(content=="1")
                {
                     // Response.Write(str);
                    Response.Write(GetNewsMessage(toUserName, fromUserName));
                    return;
                }
                if (content == "2")
                {
                    Response.Write(GetUserBlogMessage(toUserName, fromUserName));
                     return;
                }
                if (content == "3")
                {
                    Response.Write(GetGroupMessage(toUserName, fromUserName));
                   return;
                }
                if (content == "4")
                {
                    Response.Write(GetWinePartyMessage(toUserName, fromUserName));
                    return;
                }
                Response.Write(GetMainMenuMessage(toUserName, fromUserName, "你好，我是vinehoo,"));

           }
           else if (msgType == ReqMsgType.Event)
           {
               // 事件类型
               String eventType = (string)requestHT["Event"];
               // 订阅
               if (eventType==ReqEventType.Subscribe)
               {

                   Response.Write(GetMainMenuMessage(toUserName, fromUserName, "谢谢您的关注！,"));

               }
               // 取消订阅
               else if (eventType==ReqEventType.Unsubscribe)
               {
                   // TODO 取消订阅后用户再收不到公众号发送的消息，因此不需要回复消息
               }
               // 自定义菜单点击事件
               else if (eventType==ReqEventType.CLICK)
               {
                   // TODO 自定义菜单权没有开放，暂不处理该类消息
               }
           }
           else if (msgType == ReqMsgType.Location)
           {
           }


        }
        catch (Exception e)
        {

        }
    }<pre name="code" class="csharp">    protected void Page_Load(object sender, EventArgs e)
    {

        if (Request.HttpMethod.ToUpper() == "GET")
        {
            // 微信加密签名
            string signature = Request.QueryString["signature"];
            // 时间戳
            string timestamp = Request.QueryString["timestamp"];
            // 随机数
            string nonce = Request.QueryString["nonce"];
            // 随机字符串
            string echostr = Request.QueryString["echostr"];
            if (WeixinServer.CheckSignature(signature, timestamp, nonce))
            {
                Response.Write(echostr);
            }

        }
        else if (Request.HttpMethod.ToUpper() == "POST")
        {

           StreamReader stream = new StreamReader(Request.InputStream);
           string xml = stream.ReadToEnd();

           processRequest(xml);
        }


    }


    /// <summary>
    /// 处理微信发来的请求
    /// </summary>
    /// <param name="xml"></param>
    public void processRequest(String xml)
    {
        try
        {

            // xml请求解析
            Hashtable requestHT = WeixinServer.ParseXml(xml);

            // 发送方帐号（open_id）
            string fromUserName = (string)requestHT["FromUserName"];
            // 公众帐号
            string toUserName = (string)requestHT["ToUserName"];
            // 消息类型
            string msgType = (string)requestHT["MsgType"];

            //文字消息
            if (msgType == ReqMsgType.Text)
            {
               // Response.Write(str);

               string content = (string)requestHT["Content"];
                if(content=="1")
                {
                     // Response.Write(str);
                    Response.Write(GetNewsMessage(toUserName, fromUserName));
                    return;
                }
                if (content == "2")
                {
                    Response.Write(GetUserBlogMessage(toUserName, fromUserName));
                     return;
                }
                if (content == "3")
                {
                    Response.Write(GetGroupMessage(toUserName, fromUserName));
                   return;
                }
                if (content == "4")
                {
                    Response.Write(GetWinePartyMessage(toUserName, fromUserName));
                    return;
                }
                Response.Write(GetMainMenuMessage(toUserName, fromUserName, "你好，我是vinehoo,"));

           }
           else if (msgType == ReqMsgType.Event)
           {
               // 事件类型
               String eventType = (string)requestHT["Event"];
               // 订阅
               if (eventType==ReqEventType.Subscribe)
               {

                   Response.Write(GetMainMenuMessage(toUserName, fromUserName, "谢谢您的关注！,"));

               }
               // 取消订阅
               else if (eventType==ReqEventType.Unsubscribe)
               {
                   // TODO 取消订阅后用户再收不到公众号发送的消息，因此不需要回复消息
               }
               // 自定义菜单点击事件
               else if (eventType==ReqEventType.CLICK)
               {
                   // TODO 自定义菜单权没有开放，暂不处理该类消息
               }
           }
           else if (msgType == ReqMsgType.Location)
           {
           }


        }
        catch (Exception e)
        {

        }
    }</pre><br>
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