.NET 微信Token验证和消息接收和回复

  public class wxXmlModel
     {
         public string ToUserName { get; set; }
         public string FromUserName { get; set; }
         public string CreateTime { get; set; }
         public string MsgType { get; set; }
         public string Content { get; set; }
         public string MsgId { get; set; }

     }

   public string Token = "Token";

         protected void Page_Load(object sender, EventArgs e)
         {
             string echoStr = Request.QueryString["echoStr"];

             if (CheckSignature() && !string.IsNullOrEmpty(echoStr))
             {
                 Response.Write(echoStr);
                 Response.End();
             }
             else {
                 //如果没有接收到echostr说明不在是使用token验证
                 //接收微信发送过来的xml消息并且解析
                  Stream requestSream=HttpContext.Current.Request.InputStream;
                 byte[] requestByte=new byte[requestSream.Length];
                 requestSream.Read(requestByte,,(int)requestSream.Length);
                 string requestStr=Encoding.UTF8.GetString(requestByte);

                 if(!string.IsNullOrEmpty(requestStr))
                 {
                     //封装请求类
                      XmlDocument requestDocXml=new XmlDocument();
                     requestDocXml.LoadXml(requestStr);
                     XmlElement rootElement=requestDocXml.DocumentElement;
                     wxXmlModel wxXmlModel=new wxXmlModel();
                     wxXmlModel.ToUserName=rootElement.SelectSingleNode("ToUserName").InnerText;
                     wxXmlModel.FromUserName=rootElement.SelectSingleNode("FromUserName").InnerText;
                     wxXmlModel.CreateTime=rootElement.SelectSingleNode("CreateTime").InnerText;
                     wxXmlModel.MsgType=rootElement.SelectSingleNode("MsgType").InnerText;
                     switch(wxXmlModel.MsgType)
                     {
                         case "text":
                             wxXmlModel.Content=rootElement.SelectSingleNode("Content").InnerText;
                             break;
                         default:
                             break;

                     }
                  string      xmlMsg = "<xml>" + "<ToUserName><![CDATA[" + wxXmlModel.FromUserName+ "]]></ToUserName>"
                        + "<FromUserName><![CDATA[" + wxXmlModel.ToUserName + "]]></FromUserName>"
                        + "<CreateTime>" + DateTime.Now + "</CreateTime>"
                        + "<MsgType><![CDATA[text]]></MsgType>"
                        + "<Content><![CDATA["+wxXmlModel.Content+"]]></Content>"
                        + "</xml>";

                    Response.Write(xmlMsg);
                 }
             }
         }
  private bool CheckSignature()
         {
             string signature = Request.QueryString["signature"];
             string timestamp = Request.QueryString["timestamp"];
             string nonce = Request.QueryString["nonce"];

             string[] arrTmp = { Token, timestamp, nonce };
             Array.Sort(arrTmp);
             string tmpStr = string.Join("", arrTmp);
             tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
             if (tmpStr != null)
             {
                 tmpStr = tmpStr.ToLower();
                 return tmpStr == signature;
             }
             return false;
         }