/// <summary>
        /// DataGrid
        /// Toolbar
        /// </summary>
        /// <param name="helper"></param>
        /// <param name="id"></param>
        /// <param name="text"></param>
        /// <param name=""></param>
        /// <param name="token"></param>
        /// <param name="role"></param>
        /// <param name="htmlAttributes"></param>
        /// <returns></returns>
        public static MvcHtmlString ToolbarFor(this HtmlHelper helper, string id, string text, string css, dynamic htmlAttributes)
        {
            var builder = new TagBuilder("a");            
            builder.IdAttributeDotReplacement = "-";
            builder.GenerateId(id);
            var dic = new RouteValueDictionary(htmlAttributes);
            Dictionary<string, object> dicAttrs = new Dictionary<string, object>();
            string token = string.Empty;
            string role = string.Empty;
            foreach (var item in dic)
            {
                switch (item.Key)
                {
                    case "options":
                        dicAttrs.Add("data-options", item.Value);
                        break;
                    case "token":
                        token = Convert.ToString(item.Value);
                        break;
                    case "role":
                        role = Convert.ToString(item.Value);
                        break;
                    default:
                        dicAttrs.Add(item.Key, item.Value);
                        break;
                }
            }
            if (!string.IsNullOrEmpty(token))
            {
                if (string.IsNullOrEmpty(role))
                {
                    return MvcHtmlString.Create("");
                }
                if (MasterPermissionAuthorizeAttribute.HasRoles(token, role)==false)
                {
                    return MvcHtmlString.Create("");
                }
            }
            //添加屬性
            builder.MergeAttributes(dicAttrs);

            //添加樣式
            builder.AddCssClass(css);            
            builder.SetInnerText(text);

            //輸出控件
            return MvcHtmlString.Create(HttpUtility.HtmlDecode(builder.ToString(TagRenderMode.Normal)));
        }