【转】C# 中Linq查询所有上级节点或所有下级节点

using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net.Http; using System.Text; using System.Threading.Tasks;namespace ConsoleApp7 {class Program{static void Main(string[] args){var data = GetData();//获取所有下级//var query = GetSons(data, 1);//获取所有上级var query = GetFatherList(data, 5);Console.WriteLine("Id\t 区划\t 父ID\t 层级\t");query.ToList().ForEach(q => Console.WriteLine("{0}\t {1}\t {2}\t {3}\t", q.Id, q.Name, q.Fid, q.Level));Console.ReadLine();}#region 测试数据public static IList<menu> GetData(){var list = new List<menu>();list.Add(new menu { Id = 1, Name = "广东省", Fid = 0, Level = 1 });list.Add(new menu { Id = 2, Name = "深圳市", Fid = 1, Level = 2 });list.Add(new menu { Id = 3, Name = "南山区", Fid = 2, Level = 3 });list.Add(new menu { Id = 4, Name = "福田区", Fid = 2, Level = 3 });list.Add(new menu { Id = 5, Name = "上梅林", Fid = 4, Level = 4 });list.Add(new menu { Id = 6, Name = "下梅林", Fid = 4, Level = 4 });list.Add(new menu { Id = 7, Name = "车公庙", Fid = 4, Level = 4 });list.Add(new menu { Id = 8, Name = "蛇口", Fid = 5, Level = 4 });list.Add(new menu { Id = 9, Name = "科技园", Fid = 5, Level = 4 });list.Add(new menu { Id = 10, Name = "湖南省", Fid = 0, Level = 1 });list.Add(new menu { Id = 11, Name = "长沙市", Fid = 10, Level = 2 });list.Add(new menu { Id = 12, Name = "芙蓉区", Fid = 11, Level = 3 });return list;}#endregion#region 获取所有下级public static IEnumerable<menu> GetSons(IList<menu> list, int Fid){var query = list.Where(p => p.Id == Fid).ToList();var list2 = query.Concat(GetSonList(list, Fid));return list2;}public static IEnumerable<menu> GetSonList(IList<menu> list, int Fid){var query = list.Where(p => p.Fid == Fid).ToList();return query.ToList().Concat(query.ToList().SelectMany(t => GetSonList(list, t.Id)));}#endregion#region 获取所有上级public static IEnumerable<menu> GetFatherList(IList<menu> list, int Id){var query = list.Where(p => p.Id == Id).ToList();return query.ToList().Concat(query.ToList().SelectMany(t => GetFatherList(list, t.Fid)));}#endregion#region 实体类public class menu{public int Id { set; get; }public string Name { set; get; }public int Fid { set; get; }public int Level { set; get; }}#endregion} }

 转自：https://blog.csdn.net/smartsmile2012/article/details/81317327

转载于:https://www.cnblogs.com/yunspider/p/10502225.html

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