C# List泛型類某個字段","（逗號）進行分割，組成新的List泛型類

展示效果圖

　　

 代碼

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

namespace 分割字符串
{
    class Program
    {
        static void Main(string[] args)
        {
            Studen st1 = new Studen { Id = 1, Name = "張三", Aihao = "打羽毛球,打乒乓球" };
            Studen st2 = new Studen { Id = 2, Name = "李四", Aihao = "打籃球" };
            Studen st3 = new Studen { Id = 3, Name = "王五", Aihao = "打台球,打羽毛球,踢足球" };
            Studen st4 = new Studen { Id = 4, Name = "趙六", Aihao = "打羽毛球,打乒乓球,打游戲" };
            Studen st5 = new Studen { Id = 5, Name = "孫七", Aihao = "打羽毛球" };
            Studen st6 = new Studen { Id = 6, Name = "周八", Aihao = "下象棋" };

            List<Studen> stList = new List<Studen>();
            List<Studen> newStList = new List<Studen>();
            stList.Add(st1);
            stList.Add(st2);
            stList.Add(st3);
            stList.Add(st4);
            stList.Add(st5);
            stList.Add(st6);

            foreach (var item in stList)
            {
                if (item.Aihao.IndexOf(",") > 0)
                {
                    string[] arr = item.Aihao.Split(',');
                    foreach (string s in arr)
                    {
                        Studen st8 = new Studen();
                        st8.Id = item.Id;
                        st8.Name = item.Name;
                        st8.Aihao = s;
                        newStList.Add(st8);
                    }
                }
                else
                {
                    Studen st7 = new Studen();
                    st7.Id = item.Id;
                    st7.Name = item.Name;
                    st7.Aihao = item.Aihao;
                    newStList.Add(st7);
                }
            }
            Console.WriteLine("舊");
            foreach (var item in stList)
            {
                Console.Write(item.Id + "\t");
                Console.Write(item.Name + "\t");
                Console.WriteLine(item.Aihao);
            }
            Console.WriteLine("新");
            foreach (var item in newStList)
            {
                Console.Write(item.Id + "\t");
                Console.Write(item.Name + "\t");
                Console.WriteLine(item.Aihao);
            }
            Console.ReadKey();
        }
    }

    public class Studen
    {
        private int id;
        private string name;
        private string aihao;

        public int Id { get => id; set => id = value; }
        public string Name { get => name; set => name = value; }
        public string Aihao { get => aihao; set => aihao = value; }
    }
}