/// <summary>
 /// 是否容许调用自定义Handle
 /// </summary>
 /// <param name="context"></param>
 /// <param name="handler"></param>
 /// <param name="ajaxCallType"></param>
 /// <returns></returns>
 public static bool isAllow(HttpContext context, AjaxCallCheckHandler handler, AjaxCallType ajaxCallType)
 {
     if (handler == null)
     {
         return true;
     }
     AjaxCallEventArgs e = new AjaxCallEventArgs(context, ajaxCallType);
     handler(e);
     if (!e.isAllow)
     {
         HttpHelper.WriteSimpleMessage(context,e.DenyInfoMsg);
     }
     return e.isAllow;
 }
 /// <summary>
 /// 构造函数初始化
 /// </summary>
 /// <param name="context">HTTP对象</param>
 /// <param name="ajaxCallType"></param>
 public AjaxCallEventArgs(HttpContext context, AjaxCallType ajaxCallType)
 {
     this.context = context;
     this.ajaxCallType = ajaxCallType;
 }