C# .NetCore简单实现无限递归的功能(菜单树）

using System;
using System.Collections.Generic;
using ConsoleApp1.Models;
using System.Linq;
using Newtonsoft.Json;
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var allData = GetListData();
            var parentNode = allData.Where(p => p.PParentId == 0).ToList();
            List<PersonModel> tree = new List<PersonModel>();
            foreach (var item in parentNode)
            {
                PersonModel p1 = new PersonModel { Children = new List<PersonModel> { } };
                int _id = item.ID;
                p1.ID = _id;
                p1.Pname = item.Pname;
                p1.Age = item.Age;
                p1.PParentId = item.PParentId;
                GetNewNodes(allData, p1);
                tree.Add(p1);
            }
            string jsonTree = JsonConvert.SerializeObject(tree, Formatting.Indented);
            Console.WriteLine(jsonTree);
            Console.ReadKey();
        }
 
        static void GetNewNodes(List<PersonModel> all, PersonModel curItem)
        {
            var subItems = all.Where(c => c.PParentId == curItem.ID).ToList();
            curItem.Children = new List<PersonModel>();
            curItem.Children.AddRange(subItems);
            foreach (var subItem in subItems)
            {
                GetNewNodes(all, subItem);
            }
        }
        static List<PersonModel> GetListData()
        {
            return new List<PersonModel> {
                    new PersonModel{ID=1001,Age=68,Pname="QQ1",PParentId=0 },
                    new PersonModel{ID=1002,Age=78,Pname="ww",PParentId=0 },
                    new PersonModel{ID=1003,Age=67,Pname="dd",PParentId=0 },
                    new PersonModel{ID=1004,Age=88,Pname="ff",PParentId=0 },
 
                    new PersonModel{ID=1005,Age=18,Pname="gg",PParentId=1001},
                    new PersonModel{ID=1006,Age=16,Pname="cc",PParentId=1003},
                    new PersonModel{ID=1007,Age=17,Pname="aa",PParentId=1006},
                    new PersonModel{ID=1008,Age=19,Pname="tt",PParentId=1007},
                    new PersonModel{ID=1009,Age=20,Pname="ii",PParentId=1004},
                     new PersonModel{ID=1010,Age=22,Pname="ggf",PParentId=1003}
            };
        }
    }
}