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This article mainly introduces the. Net development of Wechat official account message how to deal with, the article is very detailed, has a certain reference value, interested friends must read it!

one。 Preface

Wechat public platform message processing is relatively perfect, there are the most basic text messages, to picture and text messages, to picture messages, voice messages, video messages, music messages the basic principles are the same, but the post xml data are different, before dealing with messages, we should carefully read the official document: http://mp.weixin.qq.com/wiki/14/89b871b5466b19b3efa4ada8e577d45e.html. Let's start with the most basic text message processing.

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We can see that this is one of the most basic modes of message processing, including sender, receiver, creation time, type, content, and so on.

First of all, let's create a message processing class that captures all message requests and handles different message replies according to different message request types.

Public class WeiXinService {/ TOKEN / private const string TOKEN = "finder"; / signature / private const string SIGNATURE = "signature"; / timestamp / private const string TIMESTAMP = "timestamp"; / Random number / private const string NONCE = "nonce" / Random string / private const string ECHOSTR = "echostr"; / private HttpRequest Request {get; set;} / constructor / public WeiXinService (HttpRequest request) {this.Request = request } / process the request and generate a response / public string Response () {string method = Request.HttpMethod.ToUpper (); / / verify the signature if (method = = "GET") {if (CheckSignature ()) {return Request.QueryString [ECHOSTR] } else {return "error";}} / / processing message if (method = = "POST") {return ResponseMsg ();} else {return "cannot be processed" } / private string ResponseMsg () {string requestXml = CommonWeiXin.ReadRequest (this.Request); IHandler handler = HandlerFactory.CreateHandler (requestXml); if (handler! = null) {return handler.HandleRequest ();} return string.Empty } / check signature / private bool CheckSignature () {string signature = Request.QueryString [SIGNATURE]; string timestamp = Request.QueryString [TIMESTAMP]; string nonce = Request.QueryString [NONCE]; List list = new List (); list.Add (TOKEN); list.Add (timestamp); list.Add (nonce) / / sort list.Sort (); / / string string input = string.Empty; foreach (var item in list) {input + = item;} / / encryption string new_signature = SecurityUtility.SHA1Encrypt (input); / / verify if (new_signature = = signature) {return true;} else {return false }}}

Let's take a look at how our first step is to capture messages. The code for the home page Default.ashx is as follows

Public void ProcessRequest (HttpContext context) {context.Response.ContentType = "text/html"; string postString = string.Empty; if (HttpContext.Current.Request.HttpMethod.ToUpper () requests = "POST") {/ / received by Wechat service, WeiXinService wxService = new WeiXinService (context.Request); string responseMsg = wxService.Response (); context.Response.Clear () Context.Response.Charset = "UTF-8"; context.Response.Write (responseMsg); context.Response.End ();} else {string token = "wei2414201"; if (string.IsNullOrEmpty (token)) {return;} 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"]; if (! string.IsNullOrEmpty (echoString)) {HttpContext.Current.Response.Write (echoString); HttpContext.Current.Response.End ();}

From the above code, we can see that the messages in the WeiXinService.cs class are correspondingly critical.

/ private string ResponseMsg () {string requestXml = CommonWeiXin.ReadRequest (this.Request); IHandler handler = HandlerFactory.CreateHandler (requestXml); if (handler! = null) {return handler.HandleRequest ();} return string.Empty;}

IHandler is a message processing interface, which is implemented by an EventHandler,TextHandler processing class. The code is as follows

/ processing interface / public interface IHandler {/ processing request / string HandleRequest ();}

EventHandler

Class EventHandler: IHandler {/ requested xml / private string RequestXml {get; set;} / constructor / public EventHandler (string requestXml) {this.RequestXml = requestXml } / process request / public string HandleRequest () {string response = string.Empty; EventMessage em = EventMessage.LoadFromXml (RequestXml); if (em.Event.Equals ("subscribe", StringComparison.OrdinalIgnoreCase)) / / is used to determine whether it is the first time to follow {PicTextMessage tm = new PicTextMessage () / / A message handling class tm.ToUserName = em.FromUserName; tm.FromUserName = em.ToUserName; tm.CreateTime = CommonWeiXin.GetNowTime (); response = tm.GenerateContent ();} return response;} created by myself

TextHandler

/ / text message handling class / public class TextHandler: IHandler {string openid {get; set;} string access_token {get; set;} / private string RequestXml {get; set of the request } / constructor / xml public TextHandler (string requestXml) of the request {this.RequestXml = requestXml;} / process the request / public string HandleRequest () {string response = string.Empty; TextMessage tm = TextMessage.LoadFromXml (RequestXml); string content = tm.Content.Trim () If (string.IsNullOrEmpty (content)) {response = "you haven't typed anything, so I can't help you." ;} else {string username = System.Configuration.ConfigurationManager.AppSettings ["weixinid"] .ToString (); AccessToken token = AccessToken.Get (username); access_token = token.access_token; openid = tm.FromUserName; response = HandleOther (content);} tm.Content = response / / convert sender to receiver string temp = tm.ToUserName; tm.ToUserName = tm.FromUserName; tm.FromUserName = temp; response = tm.GenerateContent (); return response;} / process other messages / private string HandleOther (string requestContent) {string response = string.Empty If (requestContent.Contains ("Hello") | | requestContent.Contains ("Hello") {response = "how are you ~";} else if (requestContent.Contains ("openid") | | requestContent.Contains ("id") | | requestContent.Contains ("ID") / / to match the keyword {response = "your Openid:" + openid entered by the user } else if (requestContent.Contains ("token") | | requestContent.Contains ("access_token") {response = "your access_token:" + access_token;} else {response = "try other keywords." ;} return response;}}

HandlerFactory

/ processor factory class / public class HandlerFactory {/ create the processor / request xml / IHandler object public static IHandler CreateHandler (string requestXml) {IHandler handler = null; if (! string.IsNullOrEmpty (requestXml)) {/ / parse data XmlDocument doc = new System.Xml.XmlDocument () Doc.LoadXml (requestXml); XmlNode node = doc.SelectSingleNode ("/ xml/MsgType"); if (node! = null) {XmlCDataSection section = node.FirstChild as XmlCDataSection; if (section! = null) {string msgType = section.Value Switch (msgType) {case "text": handler = new TextHandler (requestXml); break; case "event": handler = new EventHandler (requestXml); break;} return handler;}}

Here some basic classes have been completed, now we are done, follow our Wechat official account, we will send a picture and text message, while typing some of our keywords, return some messages, such as typing id to return the user's openid, and so on.

II. PicTextMessage

Public class PicTextMessage: Message {/ template static field / private static string template template; / default constructor / public PicTextMessage () {this.MsgType = "news" } / public static PicTextMessage LoadFromXml (string xml) {PicTextMessage tm = null; if (! string.IsNullOrEmpty (xml)) {XElement element = XElement.Parse (xml); if (element! = null) {tm = new PicTextMessage () Tm.FromUserName = element.Element (CommonWeiXin.FROM_USERNAME) .value; tm.ToUserName = element.Element (CommonWeiXin.TO_USERNAME) .value; tm.CreateTime = element.Element (CommonWeiXin.CREATE_TIME) .value;}} return tm } / template / public override string Template {get {if (string.IsNullOrEmpty (m_Template)) {LoadTemplate ();} return m_Template }} / public override string GenerateContent () {this.CreateTime = CommonWeiXin.GetNowTime (); string str= string.Format (this.Template, this.ToUserName, this.FromUserName, this.CreateTime); return str } / load template / private static void LoadTemplate () {masked Template@ "{2} 1 " }}

Finally, our effect is as follows

These are all the contents of this article entitled "how to deal with official account messages on .net development Wechat official account". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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