/// <summary>

        /// 传入虚拟路径 返回全路径的html字符串

        /// </summary>

        /// <param name="context">当前数据上下文</param>

        /// <param name="virtualPath">虚拟路径</param>

        /// <returns>返回全路径的html字符串</returns>

        public static string GetHtmlFromVirtualPath(HttpContext context,string virtualPath)

        {

            string fileFullPath = context.Server.MapPath(virtualPath);

            string html = File.ReadAllText(fileFullPath);

            return html;

        }

        /// <summary>

        /// 输出错误信息到错误界面

        /// </summary>

        /// <param name="context">当前数据上下文</param>

        /// <param name="virtualPath">错误页面的 虚拟路径</param>

        /// <param name="errormsg">错误信息</param>

        private void OutputError(HttpContext context, string virtualPath,string errormsg)

        {

            string htmlError = GetHtmlFromVirtualPath(context, virtualPath);

            string htmlNewError = htmlError.Replace("{errormsg}", errormsg);

            context.Response.Write(htmlNewError);

        }