net core 通过js打印集合（创建树）

Posted 2022-03-11 cat66

 结合ASP.NET CORE，将控制器执行后的数据结果打印在网页控制台

将行数据转为树形结构（采用linq+lambda+递归）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication1.Logic.CreateTree

    public class Node
    
        public int id;
        public string name;
        public int? parentid;
    
    public class NewNode
    
        public int id;
        public string name;
        public int? parentid;
        public List<NewNode> items;
    

    public static class TreeFns
    
        public static List<NewNode> CreateNewTree(List<Node> originalList)
        
            List<NewNode> nodes = originalList.Where(v => v.parentid == null).Select(v => new NewNode()  id = v.id, name = v.name, parentid = v.parentid, items = new List<NewNode>()   ).ToList();
            foreach (NewNode node in nodes)
            
                node.items = GetAllLeaves(node, originalList);
            
            return nodes;
        

        public static List<NewNode> GetAllLeaves(NewNode val, List<Node> originalList)
        
            List<NewNode> nodes = originalList.Where(v => v.parentid == val.id).Select(v => new NewNode()  id = v.id, name = v.name, parentid = v.parentid, items = new List<NewNode>()   ).ToList();
            foreach (NewNode node in nodes)
            
                node.items = GetAllLeaves(node, originalList);
            
            return nodes;
        
    

结果