微信公眾平臺開發學習系列（二）：微信公眾平臺接收消息與發送消息

2019-11-14 14:31:30

字體：大中小

來源：轉載

供稿：網友

本篇主要介紹如何使用senparc來處理微信公眾平臺的接收消息與發送消息。

首先微信端會將用戶的發送的信息以post請求發送到填寫的url上，服務端代碼如下：

1         [HttpPost]2         public ActionResult Get(PostModel postModel)3         {4             var messageHandler = new CustomMessageHandler(Request.InputStream, postModel);5 6             messageHandler.Execute();//執行微信處理過程7 8             return Content(messageHandler.ResponseDocument.ToString());9         }

新建一個CustomMessageHandler類和一個CustomMessageContext類，CustomMessageHandler類繼承MessageHandler<CustomMessageContext>，CustomMessageContext類繼承MessageContext<IRequestMessageBase,IResponseMessageBase>，CustomMessageContext類的方法此處不貼出，主要是實現CustomMessageHandler類的方法，代碼如下：

 1         public CustomMessageHandler(Stream inputStream, PostModel postModel) 2             : base(inputStream, postModel) 3         { 4  5         } 6  7         public override IResponseMessageBase DefaultResponseMessage(IRequestMessageBase requestMessage) 8         { 9             var responseMessage = base.CreateResponseMessage<ResponseMessageText>(); //ResponseMessageText指返回文本信息10             responseMessage.Content = "這條消息來自DefaultResponseMessage。"+requestMessage.MsgId;11             return responseMessage;12         }

返回信息的格式多種多樣，如：ResponseMessageText，ResponseMessageNews，ResponseMessageImage等。接收信息的格式也分很多種，不同格式有不同的處理方法：OnTextRequest，OnImageRequest,OnEvent_ViewRequest等。如果沒有重寫相應方法，就默認執行DefaultResponseMessage方法。本篇重寫2個方法作為簡單的例子。

用戶發送文本信息情況下的返回信息處理

1         public override IResponseMessageBase OnTextRequest(RequestMessageText requestMessage)2         {3             var responseMessage = base.CreateResponseMessage<ResponseMessageText>();4             responseMessage.Content = "您的OpenID是：" + requestMessage.FromUserName     5                                     + "。/r/n您發送了文字信息：" + requestMessage.Content; 6             return responseMessage;7         }

菜單點擊事件情況下的返回信息處理

 1         public override IResponseMessageBase OnEvent_ClickRequest(RequestMessageEvent_Click requestMessage) 2         { 3             IResponseMessageBase reponseMessage = null; 4             //菜單點擊，需要跟創建菜單時的Key匹配 5             switch (requestMessage.EventKey) 6             { 7                 case "OneClick": 8                     { 9                         var strongResponseMessage = CreateResponseMessage<ResponseMessageNews>();10                         reponseMessage = strongResponseMessage;11                         strongResponseMessage.Articles.Add(new Article()12                         {13                             Title = "您點擊了菜單圖文按鈕",14                             Description = "您點擊圖文鏈接按鈕，這是一條圖文信息。",15                             PicUrl = "https://ss2.baidu.com/6ONYsjip0QIZ8tyhnq/it/u=3233073314,694013259&fm=58&s=39C718720E8EBE011B398BAC0300F024",16                             Url = "http://www.baidu.com"17                         });18                     }19                     break;20                 case "SubClickRoot_Text":21                     {22                         var strongResponseMessage = CreateResponseMessage<ResponseMessageText>();23                         reponseMessage = strongResponseMessage;24                         strongResponseMessage.Content = "您點擊了子菜單按鈕。";25                     }26                     break;27                 default:28                     {29                         var strongResponseMessage = CreateResponseMessage<ResponseMessageText>();30                         strongResponseMessage.Content = "您點擊了按鈕，EventKey：" + requestMessage.EventKey;31                         reponseMessage = strongResponseMessage;32                     }33                     break;34             }35 36             return reponseMessage;37         }