通过检查列表c#的父项ID，在具有孩子项时从列表中移除父项

using System;
using System.Collections.Generic;

public class Item
{
    public int ID { get; set; }
    public int ParentID { get; set; }
    // 其他属性...
}

public class Program
{
    public static void Main(string[] args)
    {
        List<Item> items = new List<Item>
        {
            new Item { ID = 1, ParentID = 0 },
            new Item { ID = 2, ParentID = 1 },
            new Item { ID = 3, ParentID = 1 },
            new Item { ID = 4, ParentID = 2 },
            new Item { ID = 5, ParentID = 0 },
            new Item { ID = 6, ParentID = 5 },
            new Item { ID = 7, ParentID = 5 }
        };

        // 遍历父项，检查是否有孩子项
        foreach (var parent in items)
        {
            bool hasChildren = false;
            foreach (var child in items)
            {
                if (child.ParentID == parent.ID)
                {
                    hasChildren = true;
                    break;
                }
            }

            // 如果父项有孩子项，则从列表中移除
            if (hasChildren)
            {
                items.Remove(parent);
            }
        }

        // 输出移除父项后的列表
        foreach (var item in items)
        {
            Console.WriteLine("ID: {0}, ParentID: {1}", item.ID, item.ParentID);
        }
    }
}