public ActionResult FindTreeList()
        {
            int count = 0;
            var list  = ProductCategoryService.GetPageList(Request.Params, out count);

            list.Each(o => {
                o.Childrens.Each(i =>
                {
                    i.OnOff = i.Childrens != null && i.Childrens.Any()? "closed":"open";
                });
            });
            var trees = new List <ProductCategory>()
            {
                new ProductCategory()
                {
                    Id        = 0,
                    Title     = "商品分类",
                    OnOff     = "open",
                    Childrens = new List <ProductCategory>()
                }
            };

            trees[0].Childrens.AddRange(list);
            return(new JsonNetResult(trees));
        }