public ActionResult Index()
        {
            CRMEntities db = new CRMEntities();
            EasyUIJsonTree root = new EasyUIJsonTree()
            {
                text = "菜单根节点"
            };
            IList<Trees> list = db.Trees.ToList();
            if (list != null && list.Count > 0)
            {
               b.GetTree(root, list);
            }
            return Json(root, JsonRequestBehavior.AllowGet);
            //return JsonResult(new { root });
            // Response.Write(JsonConvert.SerializeObject(new EasyUIJsonTree[] { root }));
        }

public class b
    {

　　 public static void GetTree(EasyUIJsonTree parent, IList<Trees> list, int? parentID = 0)
        {
            var query = list.Where(m => m.pid == parentID);
            if (query.Any())
            {
                if (parent.children == null)
                {
                    parent.children = new List<EasyUIJsonTree>();
                }
                foreach (Trees mv in query)
                {
                    EasyUIJsonTree child = new EasyUIJsonTree()
                    {
                        id = mv.id.ToString(),
                        text = mv.text,
                        //attributes = new { Url = mv.Url }
                    };
                    parent.children.Add(child);
                    b.GetTree(child, list, mv.id);
                }
            }
        }
    }
    public class EasyUIJsonTree
    {
        public string id { get; set; }
        public string text { get; set; }
        //public string iconCls { get; set; }
        public IList<EasyUIJsonTree> children { get; set; }
        public object attributes { get; set; }
    }

c# 格式化easyui tree