微信公众平台开发学习系列（二）：微信公众平台接收消息与发送消息

2019-11-14 14:31:30

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本篇主要介绍如何使用senparc来处理微信公众平台的接收消息与发送消息。

首先微信端会将用户的发送的信息以post请求发送到填写的url上，服务端代码如下：

1         [HttpPost]2         public ActionResult Get(PostModel postModel)3         {4             var messageHandler = new CustomMessageHandler(Request.InputStream, postModel);5 6             messageHandler.Execute();//执行微信处理过程7 8             return Content(messageHandler.ResponseDocument.ToString());9         }

新建一个CustomMessageHandler类和一个CustomMessageContext类，CustomMessageHandler类继承MessageHandler<CustomMessageContext>，CustomMessageContext类继承MessageContext<IRequestMessageBase,IResponseMessageBase>，CustomMessageContext类的方法此处不贴出，主要是实现CustomMessageHandler类的方法，代码如下：

 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 = "这条消息来自DefaultResponseMessage。"+requestMessage.MsgId;11             return responseMessage;12         }

返回信息的格式多种多样，如：ResponseMessageText，ResponseMessageNews，ResponseMessageImage等。接收信息的格式也分很多种，不同格式有不同的处理方法：OnTextRequest，OnImageRequest,OnEvent_ViewRequest等。如果没有重写相应方法，就默认执行DefaultResponseMessage方法。本篇重写2个方法作为简单的例子。

用户发送文本信息情况下的返回信息处理

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您发送了文字信息：" + requestMessage.Content; 6             return responseMessage;7         }

菜单点击事件情况下的返回信息处理

 1         public override IResponseMessageBase OnEvent_ClickRequest(RequestMessageEvent_Click requestMessage) 2         { 3             IResponseMessageBase reponseMessage = null; 4             //菜单点击，需要跟创建菜单时的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 = "您点击了菜单图文按钮",14                             Description = "您点击图文链接按钮，这是一条图文信息。",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 = "您点击了子菜单按钮。";25                     }26                     break;27                 default:28                     {29                         var strongResponseMessage = CreateResponseMessage<ResponseMessageText>();30                         strongResponseMessage.Content = "您点击了按钮，EventKey：" + requestMessage.EventKey;31                         reponseMessage = strongResponseMessage;32                     }33                     break;34             }35 36             return reponseMessage;37         }