ASP.NET微信开发（接口指南）


            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：



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> 

<pre></pre> 

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本文已被整理到了《ASP.NET微信开发教程汇总》，欢迎大家学习阅读。

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