【优化】优化新版treeTable下【菜单管理】使用简单数据模式可能导致数据混乱的问题，改为后台进行递归后返回数据到前端展示树。

CoreCms.Net.Utility/Helper/SysMenuHelper.cs

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+using CoreCms.Net.Model.Entities;
+using CoreCms.Net.Model.ViewModels.UI;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CoreCms.Net.Utility.Helper
+{
+    public static class SysMenuHelper
+    {
+
+        #region 获取商品分类下来Dtree============================================================
+
+        /// <summary>
+        /// 获取导航下拉上级树
+        /// </summary>
+        /// <returns></returns>
+        [Description("获取导航下拉上级树")]
+        public static DTree GetTree(List<SysMenu> categories, bool isHaveTop = true)
+        {
+
+            var model = new DTree();
+            model.status = new dtreeStatus() { code = 200, message = "操作成功" };
+
+            var list = GetMenus(categories, 0);
+
+            if (isHaveTop)
+            {
+                list.Insert(0, new dtreeChild()
+                {
+                    id = "0",
+                    last = true,
+                    parentId = "0",
+                    title = "无父级",
+                    children = new List<dtreeChild>()
+                });
+            }
+            model.data = list;
+            return model;
+        }
+
+
+        /// <summary>
+        /// 迭代方法
+        /// </summary>
+        /// <param name="oldNavs"></param>
+        /// <param name="parentId"></param>
+        /// <returns></returns>
+        private static List<dtreeChild> GetMenus(List<SysMenu> oldNavs, int parentId)
+        {
+            List<dtreeChild> childTree = new List<dtreeChild>();
+            var model = oldNavs.Where(p => p.parentId == parentId).ToList();
+            foreach (var item in model)
+            {
+                var parentTree = new dtreeChild();
+                parentTree.id = item.id.ToString();
+                parentTree.title = item.menuName;
+                parentTree.parentId = item.parentId.ToString();
+                parentTree.last = !oldNavs.Exists(p => p.parentId == item.id);
+                parentTree.isParent = !parentTree.last;
+                parentTree.otherData = item;
+
+                childTree.Add(parentTree);
+                parentTree.children = GetMenus(oldNavs, item.id);
+            }
+            return childTree;
+        }
+
+        #endregion
+
+    }
+}