asp.net开发微信公众平台之验证消息的真实性

/// <summary>  /// 微信推送消息模型  /// </summary>  public class WeChatMsgRequestModel  {    public string timestamp { get; set; }    public string nonce { get; set; }    public string msg_signature { get; set; }  }

public class WeChatRequestValidAttribute : ActionFilterAttribute  {    private const string Token = "StupidMe";    public override void OnActionExecuting(ActionExecutingContext filterContext)    {      //参数适配      Model.FormatModel.WeChatMsgRequestModel model = new Model.FormatModel.WeChatMsgRequestModel() { nonce= filterContext.HttpContext.Request.QueryString["nonce"],msg_signature= filterContext.HttpContext.Request.QueryString["msg_signature"],timestamp= filterContext.HttpContext.Request.QueryString["timestamp"] };      //验证      if (CheckSignature(model))      {        base.OnActionExecuting(filterContext);      }          }    private bool CheckSignature(Model.FormatModel.WeChatMsgRequestModel model)    {      string signature, timestamp, nonce, tempStr;      //获取请求来的参数      signature = model.msg_signature;      timestamp = model.timestamp;      nonce = model.nonce;      //创建数组，将 Token, timestamp, nonce 三个参数加入数组      string[] array = { Token, timestamp, nonce };      //进行排序      Array.Sort(array);      //拼接为一个字符串      tempStr = String.Join("", array);      //对字符串进行 SHA1加密      tempStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tempStr, "SHA1").ToLower();      //判断signature 是否正确      if (tempStr.Equals(signature))      {        return true;      }      else      {        return false;      }    }  }

/// <summary>    /// 日志助手    /// </summary>    private static Common.LogHelper logger = new Common.LogHelper(typeof(HomeController));    [Filters.WeChatRequestValid]    public void Valid(Model.FormatModel.WeChatMsgRequestModel model)    {      if (ModelState.IsValid)      {        try        {          //判断是否是POST请求          if (HttpContext.Request.HttpMethod.ToUpper() == "POST")          {            //从请求的数据流中获取请求信息            using (Stream stream = HttpContext.Request.InputStream)            {              byte[] postBytes = new byte[stream.Length];              stream.Read(postBytes, 0, (int)stream.Length);              string postString = System.Text.Encoding.UTF8.GetString(postBytes);              Handle(postString,model);            }          }        }        catch (Exception ex)        {          logger.Error("发生异常,异常信息：" + ex.Message + ex.StackTrace);        }      }    }