添加项目文件。

CoreCms.Net.Utility/Helper/AreaHelper.cs

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+/***********************************************************************
+ *            Project: CoreCms.Net                                     *
+ *                Web: https://CoreCms.Net                             *
+ *        ProjectName: 核心内容管理系统                                *
+ *             Author: 大灰灰                                          *
+ *              Email: JianWeie@163.com                                *
+ *         CreateTime: 2020-03-21 22:32:23
+ *        Description: 暂无
+ ***********************************************************************/
+
+
+using System.Collections.Generic;
+using System.Linq;
+using CoreCms.Net.Model.Entities;
+using CoreCms.Net.Model.ViewModels.DTO;
+
+namespace CoreCms.Net.Utility.Helper
+{
+    public class AreaHelper
+    {
+        /// <summary>
+        /// 迭代方法
+        /// </summary>
+        /// <param name="oldNavs"></param>
+        /// <param name="parentId"></param>
+        /// <returns></returns>
+        public static List<AreasDto> GetList(List<CoreCmsArea> oldNavs)
+        {
+            List<AreasDto> childList = new List<AreasDto>();
+            var model1 = oldNavs.Where(p => p.depth == 1).ToList();
+            var model2 = oldNavs.Where(p => p.depth == 2).ToList();
+            var model3 = oldNavs.Where(p => p.depth == 3).ToList();
+
+            foreach (var item in model1)
+            {
+                var child = new AreasDto();
+                child.value = item.id;
+                child.label = item.name;
+
+                var fsChild = new List<AreasDto>();
+                var sc = model2.Where(p => p.parentId == item.id).ToList();
+                foreach (var sss in sc)
+                {
+                    var scItem = new AreasDto();
+                    scItem.value = sss.id;
+                    scItem.label = sss.name;
+
+                    var scChild = new List<AreasDtoTh>();
+                    var th = model3.Where(p => p.parentId == sss.id).ToList();
+                    foreach (var itsmth in th)
+                    {
+                        scChild.Add(new AreasDtoTh()
+                        {
+                            label = itsmth.name,
+                            value = itsmth.id
+                        });
+                    }
+                    scItem.children = scChild;
+                    fsChild.Add(scItem);
+                }
+
+                child.children = fsChild;
+                childList.Add(child);
+            }
+            return childList;
+        }
+
+
+    }
+}