将项目分组为Parent ->孩子比;个孙子的关系

本文关键字：关系 孩子 项目 Parent | 更新日期: 2023-09-27 18:02:03

我的class如下:

public class Item
    {
        public int ItemID { get; set; }
        public int GroupLevel { get; set; }
        public string ItemName { get; set; }
        public string ItemDesc { get; set; }
    }

返回一个平坦的IEnumerable结果，但是我需要根据GroupLevel和ItemID将它们分组为Parent -> Child ->孙子关系。下面是当前数据的样子:

ItemID:     1
GroupLevel: 1
ItemName:   All Groups
ItemDesc:   Item 1 description
ParentID:   null
ItemID:     2
GroupLevel: 2
ItemName:   Boulder
ItemDesc:   Boulder description
ParentID:   1
ItemID:     3
GroupLevel: 2
ItemName:   Atlanta
ItemDesc:   Atlanta description
ParentID:   1
ItemID:     4
GroupLevel: 3
ItemName:   Boulder - Boulder south
ItemDesc:   Grand-child of Boulder (ID: 2)
ParentID:   2
ItemID:     5
GroupLevel: 3
ItemName:   Boulder - Boulder North
ItemDesc:   Another grand-child of Boulder (ID: 2)
ParentID:   2
ItemID:     6
GroupLevel: 3
ItemName:   Atlanta - West
ItemDesc:   Grand-child of Atlanta (ID: 3)
ParentID:   3

我想有这样的数据结构:

ItemID:     1
GroupLevel: 1
ItemName:   All Groups
ItemDesc:   Item 1 description
ParentID:       null
    ItemID:     2
    GroupLevel: 2
    ItemName:   Boulder
    ItemDesc:   Boulder description
    ParentID:       1
        ItemID:     4
        GroupLevel: 3
        ItemName:   Boulder - Boulder south
        ItemDesc:   Grand-child of Boulder (ID: 2)
        ParentID:       2
        ItemID:     5
        GroupLevel: 3
        ItemName:   Boulder - Boulder North
        ItemDesc:   Another grand-child of Boulder (ID: 2)
        ParentID:       2

    ItemID:     3
    GroupLevel: 2
    ItemName:   Atlanta
    ItemDesc:   Atlanta description
    ParentID:       1
        ItemID:     6
        GroupLevel: 3
        ItemName:   Atlanta - West
        ItemDesc:   Grand-child of Atlanta (ID: 3)
        ParentID:       3

任何建议吗?谢谢你。

将项目分组为Parent ->孩子比;个孙子的关系

你的意思是:

    List<Item> itemlist;
    List<Item> newItemList;
    public void main()
    {
        //Find all root items (aka, no parents)
        foreach (Item item in itemlist)
        {
            if (item.Parent == null) getObjects(item.ID, 0);
        }
    }
    public void getObjects(Item me, int deep)
    {
        //Store node
        Console.WriteLine("this is me: " + me.ID);
        Console.WriteLine("I am this many levels deep: " + deep);
        newItemList.Insert(me);
        //Find my children
        foreach (Item item in itemlist)
        {
            if (item.Parent == me.ID) getObjects(item.ID, (deep + 1));
        }
    }

我认为这对你很有用

linq-groupbymany-dynamically

您可以阅读示例，并根据需要创建Parent -> Child ->孙子-子关系树.....

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