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 }