C#微信公众号开发--微信事件交互

[HttpGet][ActionName("Index")]public ActionResult Get(string signature,string timestamp,string nonce,string echostr){    if (CheckSignature.Check(signature, timestamp, nonce, token))    {        return Content(echostr);    }    else    {       return Content("err");    }}

[HttpPost][ActionName("Index")]public ActionResult Get(string signature, string timestamp, string nonce){     StreamReader sr = new StreamReader(Request.InputStream, Encoding.UTF8);     XmlDocument doc = new XmlDocument();     doc.Load(sr);     sr.Close();     sr.Dispose();     WxMessage wxMessage = new WxMessage();     wxMessage.ToUserName = doc.SelectSingleNode("xml").SelectSingleNode("ToUserName").InnerText;     wxMessage.FromUserName = doc.SelectSingleNode("xml").SelectSingleNode("FromUserName").InnerText;     wxMessage.MsgType = doc.SelectSingleNode("xml").SelectSingleNode("MsgType").InnerText;     wxMessage.CreateTime = int.Parse(doc.SelectSingleNode("xml").SelectSingleNode("CreateTime").InnerText);     if (wxMessage.MsgType == "event")     {         wxMessage.EventName = doc.SelectSingleNode("xml").SelectSingleNode("Event").InnerText;         if (!string.IsNullOrEmpty(wxMessage.EventName) &amp;&amp; wxMessage.EventName == "subscribe")         {              string content = "您好，欢迎访问garfieldzf8测试公众平台";              content = SendTextMessage(wxMessage, content);              return Content(content);        }    }            return Content("");}private string SendTextMessage(WxMessage wxmessage,string content){      string result = string.Format(Message, wxmessage.FromUserName,wxmessage.ToUserName,DateTime.Now.Ticks, content);      return result;} public string Message {     get     {         return @"<xml>                      <tousername></tousername>                      <fromusername></fromusername>                      <createtime>{2}</createtime>                      <msgtype></msgtype>                      <content></content>                 </xml>";            }    }

public class WxMessage  {        public string ToUserName { get; set; }        public string FromUserName { get; set; }        public long CreateTime { get; set; }        public string Content { get; set; }        public string MsgType { get; set; }        public string EventName { get; set; }        public string EventKey { get; set; }   }