ASP.NET微信开发接口指南详细介绍

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> <br> <br>

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