接收到的消息和事件，其实都是微信post到我们配置的URL的消息。接收普通消息就是用户给公众号发送的消息，事件是由于用户的特定操作，微信post给我们的消息。被动响应消息是我们收到微信post过来的普通消息或者是事件时，企业号通过Response.Write这种方式回复的消息。
**核心代码：**
把微信post过来的数据先解密，转为能处理的XML，再把XML转为对象
~~~
#region 将POST过来的数据转化成实体对象
/// <summary>
/// 将微信POST过来的数据转化成实体对象
/// </summary>
/// <param name="token"></param>
/// <returns></returns>
public static ReceiveMessageBase ConvertMsgToObject(string msgBody = "")
{
if (string.IsNullOrWhiteSpace(msgBody))
{
Stream s = System.Web.HttpContext.Current.Request.InputStream;
byte[] b = new byte[s.Length];
s.Read(b, 0, (int)s.Length);
msgBody = Encoding.UTF8.GetString(b);
}
string CorpToken = AppIdInfo.GetToken();
string corpId = AppIdInfo.GetCorpId();
string encodingAESKey = AppIdInfo.GetEncodingAESKey();
WXBizMsgCrypt wxcpt = new WXBizMsgCrypt(CorpToken, encodingAESKey, corpId);
string msg_signature = HttpContext.Current.Request.QueryString["msg_signature"];
string timestamp = HttpContext.Current.Request.QueryString["timestamp"];
string nonce = HttpContext.Current.Request.QueryString["nonce"];
string sMsg = ""; // 解析之后的明文
int flag = wxcpt.DecryptMsg(msg_signature, timestamp, nonce, msgBody, ref sMsg);
if (flag == 0)
{
msgBody = sMsg;
LogInfo.Info("解密后的消息为" + sMsg);
}
else
{
LogInfo.Error("解密消息失败！flag=" + flag);
}
if (string.IsNullOrWhiteSpace(msgBody))
{
return null;
}
XmlDocument doc = null;
MsgType msgType = MsgType.UnKnown;
EventType eventType = EventType.UnKnown;
ReceiveMessageBase msg = new ReceiveMessageBase();
msg.MsgType = msgType;
msg.MessageBody = msgBody;
XmlNode node = null;
XmlNode tmpNode = null;
try
{
doc = new XmlDocument();
doc.LoadXml(msgBody);//解密后才是需要处理的XML数据，读取XML字符串
XmlElement rootElement = doc.DocumentElement;
XmlNode msgTypeNode = rootElement.SelectSingleNode("MsgType");//获取字符串中的消息类型
node = rootElement.SelectSingleNode("FromUserName");
if (node != null)
{
msg.FromUserName = node.InnerText;
}
node = rootElement.SelectSingleNode("AgentID");
if (node != null)
{
msg.AgentID = Convert.ToInt32(node.InnerText);
}
node = rootElement.SelectSingleNode("ToUserName");
if (node != null)
{
msg.ToUserName = node.InnerText;
}
node = rootElement.SelectSingleNode("CreateTime");
if (node != null)
{
msg.CreateTime = Convert.ToInt64(node.InnerText);
}
#region 获取具体的消息对象
string strMsgType = msgTypeNode.InnerText;
string msgId = string.Empty;
string content = string.Empty;
tmpNode = rootElement.SelectSingleNode("MsgId");
if (tmpNode != null)
{
msgId = tmpNode.InnerText.Trim();
}
string strMsgType2 = strMsgType.Trim().ToLower();
switch (strMsgType2)
{
case "text"://接收普通消息 text消息
msgType = MsgType.Text;
tmpNode = rootElement.SelectSingleNode("Content");
if (tmpNode != null)
{
content = tmpNode.InnerText.Trim();
}
TextReceiveMessage txtMsg = new TextReceiveMessage(msg)
{
MsgType = msgType,
MsgId = Convert.ToInt64(msgId),
Content = content
};
txtMsg.AfterRead();
return txtMsg;
case "image"://接收普通消息 image消息
msgType = MsgType.Image;
ImageReceiveMessage imgMsg = new ImageReceiveMessage(msg)
{
MsgId = Convert.ToInt64(msgId),
MsgType = msgType,
MediaId = rootElement.SelectSingleNode("MediaId").InnerText,
PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText
};
imgMsg.AfterRead();
return imgMsg;
case "voice"://接收普通消息 voice消息
msgType = MsgType.Voice;
XmlNode node1 = rootElement.SelectSingleNode("Recognition");
if (node1 != null)
{
msgType = MsgType.VoiceResult;
}
VoiceReceiveMessage voiceMsg = new VoiceReceiveMessage(msg)
{
MsgId = Convert.ToInt64(msgId),
MsgType = msgType,
Recognition = node1 == null ? string.Empty : node1.InnerText.Trim(),
Format = rootElement.SelectSingleNode("Format").InnerText,
MediaId = rootElement.SelectSingleNode("MediaId").InnerText
};
voiceMsg.AfterRead();
return voiceMsg;
case "video"://接收普通消息 video消息
msgType = MsgType.Video;
VideoReceiveMessage videoMsg = new VideoReceiveMessage(msg)
{
MediaId = rootElement.SelectSingleNode("MediaId").InnerText,
MsgId = Convert.ToInt64(msgId),
MsgType = msgType,
ThumbMediaId = rootElement.SelectSingleNode("ThumbMediaId").InnerText
};
videoMsg.AfterRead();
return videoMsg;
case "location"://接收普通消息 location消息
msgType = MsgType.Location;
LocationReceiveMessage locationMsg = new LocationReceiveMessage(msg)
{
MsgId = Convert.ToInt64(msgId),
MsgType = msgType,
Label = rootElement.SelectSingleNode("Label").InnerText,
Location_X = rootElement.SelectSingleNode("Location_X").InnerText,
Location_Y = rootElement.SelectSingleNode("Location_Y ").InnerText,
Scale = rootElement.SelectSingleNode("Scale").InnerText
};
locationMsg.AfterRead();
return locationMsg;
case "event":// 接收事件
msgType = MsgType.Event;
eventType = EventType.UnKnown;
msg.MsgType = msgType;
XmlNode eventNode = rootElement.SelectSingleNode("Event");
if (eventNode != null)
{
string eventtype = eventNode.InnerText.Trim().ToLower();
switch (eventtype)
{
case "subscribe": //接收事件 成员关注
eventType = EventType.Subscribe;
SubscribeEventMessage subEvt = new SubscribeEventMessage(msg)
{
EventType = EventType.Subscribe,
MsgType = msgType,
};
subEvt.AfterRead();
return subEvt;
case "unsubscribe": //接收事件 取消关注事件
eventType = EventType.UnSubscribe;
UnSubscribeEventMessage unSubEvt = new UnSubscribeEventMessage(msg)
{
EventType = eventType,
MsgType = msgType,
};
unSubEvt.AfterRead();
return unSubEvt;
case "location"://接收事件 上报地理位置事件
eventType = EventType.Location;
UploadLocationEventMessage locationEvt = new UploadLocationEventMessage(msg)
{
EventType = eventType,
Latitude = rootElement.SelectSingleNode("Latitude").InnerText,
Longitude = rootElement.SelectSingleNode("Longitude").InnerText,
MsgType = msgType,
Precision = rootElement.SelectSingleNode("Precision").InnerText,
};
locationEvt.AfterRead();
return locationEvt;
case "click": //接收事件 上报菜单事件 点击菜单拉取消息的事件推送
eventType = EventType.Click;
MenuEventMessage menuEvt = new MenuEventMessage(msg)
{
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
EventType = eventType,
MsgType = msgType,
};
menuEvt.AfterRead();
return menuEvt;
case "view": //接收事件 上报菜单事件 点击菜单跳转链接的事件推送
eventType = EventType.VIEW;
MenuEventVIEWEventMessage menuVIEWEvt = new MenuEventVIEWEventMessage(msg)
{
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
EventType = eventType,
MsgType = msgType,
};
menuVIEWEvt.AfterRead();
return menuVIEWEvt;
case "scancode_push"://接收事件 上报菜单事件 扫码推事件的事件推送
eventType = EventType.scancode_push;
ScanCodePushEventMessage scanCodePushEventMessage = new ScanCodePushEventMessage(msg)
{
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
EventType = eventType,
MsgType = msgType,
ScanCodeInfo = new ScanCodeInfo(rootElement.SelectSingleNode("ScanCodeInfo"))
};
scanCodePushEventMessage.AfterRead();
return scanCodePushEventMessage;
case "scancode_waitmsg"://接收事件 上报菜单事件 扫码推事件且弹出“消息接收中”提示框的事件推送
eventType = EventType.scancode_waitmsg;
ScanCodeWaitMsgEventMessage scanCodeWaitMsgEventMessage = new ScanCodeWaitMsgEventMessage(msg)
{
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
EventType = eventType,
MsgType = msgType,
ScanCodeInfo = new ScanCodeInfo(rootElement.SelectSingleNode("ScanCodeInfo"))
};
scanCodeWaitMsgEventMessage.AfterRead();
return scanCodeWaitMsgEventMessage;
case "pic_sysphoto"://接收事件 上报菜单事件 弹出系统拍照发图的事件推送
eventType = EventType.pic_sysphoto;
PicSysPhotoEventMessage picSysPhotoEventMessage = new PicSysPhotoEventMessage(msg)
{
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
MsgType = msgType,
SendPicsInfo = new SendPicsInfo(rootElement.SelectSingleNode("SendPicsInfo"))
};
picSysPhotoEventMessage.AfterRead();
return picSysPhotoEventMessage;
case "pic_photo_or_album"://接收事件 上报菜单事件 弹出拍照或者相册发图的事件推送
eventType = EventType.pic_photo_or_album;
PicPhotoOrAlbumEventMessage picPhotoOrAlbumEventMessage = new PicPhotoOrAlbumEventMessage(msg)
{
EventType = eventType,
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
MsgType = msgType,
SendPicsInfo = new SendPicsInfo(rootElement.SelectSingleNode("SendPicsInfo"))
};
picPhotoOrAlbumEventMessage.AfterRead();
return picPhotoOrAlbumEventMessage;
case "pic_weixin"://接收事件 上报菜单事件 弹出微信相册发图器的事件推送
eventType = EventType.pic_weixin;
PicWeiXinEventMessage picWeiXinEventMessage = new PicWeiXinEventMessage(msg)
{
EventType = eventType,
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
MsgType = msgType,
SendPicsInfo = new SendPicsInfo(rootElement.SelectSingleNode("SendPicsInfo"))
};
picWeiXinEventMessage.AfterRead();
return picWeiXinEventMessage;
case "location_select"://接收事件 上报菜单事件 弹出地理位置选择器的事件推送
eventType = EventType.location_select;
LocationSelectEventMessage locationSelectEventMessage = new LocationSelectEventMessage(msg)
{
EventType = eventType,
EventKey = rootElement.SelectSingleNode("EventKey").InnerText,
MsgType = msgType,
SendLocationInfo = new SendLocationInfo(rootElement.SelectSingleNode("SendLocationInfo"))
};
locationSelectEventMessage.AfterRead();
return locationSelectEventMessage;
case "enter_agent": //接收事件 成员进入应用的事件推送
eventType = EventType.enter_agent;
EnterAgentEventMessage EnterAgentEventMessage = new EnterAgentEventMessage(msg)
{
MsgType = msgType,
};
EnterAgentEventMessage.AfterRead();
return EnterAgentEventMessage;
default:
LogInfo.Error("事件类型" + eventtype + "未处理");
break;
}
}
break;
default:
LogInfo.Error("消息类型" + strMsgType2 + "未处理");
break;
}
msg.MsgType = msgType;
#endregion
}
catch (Exception ex)
{
LogInfo.Error("处理消息异常:" + msgBody, ex);
}
finally
{
if (doc != null)
{
doc = null;
}
}
msg.MsgType = msgType;
return msg;
}
~~~
发送被动响应文本消息：
~~~
/// <summary>
/// 发送被动响应文本消息,需要先加密在发送
/// </summary>
/// <param name="fromUserName">发送方</param>
/// <param name="toUserName">接收方</param>
/// <param name="content">文本内容</param>
public static void SendTextReplyMessage(string fromUserName, string toUserName, string content)
{
TextReplyMessage msg = new TextReplyMessage()
{
CreateTime = Tools.ConvertDateTimeInt(DateTime.Now),
FromUserName = fromUserName,
ToUserName = toUserName,
Content = content
};
/* LogInfo.Info("发送信息2sMsg=" + content);//也可以使用微信的接口发送消息
TextMsg data = new TextMsg(content);
data.agentid = "7";
data.safe = "0";
// data.toparty = "@all";
// data.totag = "@all";
data.touser = toUserName;
BLLMsg.SendMessage(data);*/
string CorpToken = AppIdInfo.GetToken();
string corpId = AppIdInfo.GetCorpId();
string encodingAESKey = AppIdInfo.GetEncodingAESKey();
WXBizMsgCrypt wxcpt = new WXBizMsgCrypt(CorpToken, encodingAESKey, corpId);
string msg_signature = HttpContext.Current.Request.QueryString["msg_signature"];
string timestamp = HttpContext.Current.Request.QueryString["timestamp"];
string nonce = HttpContext.Current.Request.QueryString["nonce"];
string encryptResponse = "";//加密后的文字
string sMsg = msg.ToXmlString();//加密前的文字
int isok = wxcpt.EncryptMsg(sMsg, timestamp, nonce, ref encryptResponse);//
LogInfo.Info("发送信息sMsg=" + sMsg);
// LogInfo.Info("发送信息encryptResponse=" + encryptResponse);
if (isok == 0 && !string.IsNullOrEmpty(encryptResponse))
{
HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
HttpContext.Current.Response.Write(encryptResponse);//被动相应消息不需要调用微信接口
}
else {
LogInfo.Info("发送信息失败isok=" + isok);
}
}
~~~
注释掉的代码就是主动发送消息，具体可参考[微信企业号开发:主动发送消息](http://blog.csdn.net/xuexiaodong009/article/details/46987227)
使用注释掉的代码也可以给用户发送消息，但这种方式不叫被动响应消息
被动响应消息实体
~~~
/// <summary>
/// 被动响应消息类
/// </summary>
public abstract class ReplyMessage
{
public string ToUserName { get; set; }
public string FromUserName { get; set; }
public long CreateTime { get; set; }
/// <summary>
/// 将对象转化为Xml消息
/// </summary>
/// <returns></returns>
public abstract string ToXmlString();
}
/// <summary>
/// 被动响应文本消息
/// </summary>
public class TextReplyMessage : ReplyMessage
{
/// <summary>
/// 回复的消息内容（换行：在content中能够换行，微信客户端就支持换行显示）
/// </summary>
public string Content { get; set; }
/// <summary>
/// 将对象转化为Xml消息
/// </summary>
/// <returns></returns>
public override string ToXmlString()
{
string s = "<xml><ToUserName><![CDATA[{0}]]></ToUserName><FromUserName><![CDATA[{1}]]></FromUserName><CreateTime>{2}</CreateTime><MsgType><![CDATA[{3}]]></MsgType><Content><![CDATA[{4}]]></Content></xml>";
s = string.Format(s,
ToUserName ?? string.Empty,
FromUserName ?? string.Empty,
CreateTime.ToString(),
"text",
Content ?? string.Empty
);
return s;
}
}
~~~
配置的URL网页的代码：
~~~
public class TestWeixin : IHttpHandler {
public void ProcessRequest (HttpContext context) {
if (context.Request.HttpMethod.ToLower() == "post")
{
try
{
System.IO.Stream s = context.Request.InputStream;
byte[] b = new byte[s.Length];
s.Read(b, 0, (int)s.Length);
string postStr = System.Text.Encoding.UTF8.GetString(b);
if (!string.IsNullOrEmpty(postStr))
{
Execute(postStr);
}
}catch(Exception e)
{
new AppException("收到信息异常" + e.Message);
}
}
else //开启应用的回调模式调用 ，代码省略
{
}
}
private void Execute(string postStr)
{
ReceiveMessageBase basemsg = ConvertMsgToObject(postStr);
if (basemsg.MsgType ==.MsgType.Text)
{
TextReceiveMessage txtMsg = basemsg as TextReceiveMessage;
if (txtMsg != null)
{
SendTextReplyMessage(txtMsg.ToUserName, txtMsg.FromUserName, "收到文本消息：" + txtMsg.Content);//发送被动消息
}
}
}
public bool IsReusable {
get {
return false;
}
}
~~~
开启应用的回调模式调用使用的代码参考[微信企业号开发:启用回调模式](http://blog.csdn.net/xuexiaodong009/article/details/46922321)
这样修改之后呢，用户给企业号发送文本消息时，企业号就可以把用户发送的消息主动回复给用户。
效果如下：
其他的类型的普通消息，也都相似。
但我个人发现，收到事件时，发送被动响应消息，似乎不保证用户能收到，似乎有很大的概率收不到，不知道是我人的原因，还是微信的原因。但奇怪的是，事件都能收到，发送被动响应消息，很大的概率收不到。
其实收到普通的消息时，也可以通过主动发送消息，也就是调用微信的相关接口，也可以达到回复用户的目的，这个我测试过，但比发送被动响应消息慢，也能实现和上边类似的效果。
