C#新手 如何得到列表A有列表B无的元素列表

[偏爱风流]

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System;

namespace CompareUtility
{

    struct Item
    {
        int id;
        int size;
    }

    public class Compare
    {
        List<Item> lstA = new List<Item>();
        List<Item> lstB = new List<Item>();

        public void Init()
        {
            //好像下面不能这样增加元素
            lstA.Add(new Item() { 1, 10 });
            lstA.Add(new Item() { 2,10});
            lstA.Add(new Item() { 3, 10 });
            lstA.Add(new Item() { 4, 10 });
            lstB.Add(new Item() { 1, 10 });
            lstB.Add(new Item() { 2, 10 });
            lstB.Add(new Item() { 3, 10 });
            lstB.Add(new Item() { 5, 10 });
        }
        //比较新增 即B有 A无
        public List<Item> CompareAdd()
        {
            //var lst = lstB.Except(lstA);
            //return lst;
            //求方法
        }

        //比较相同 即A和B都有的
        public List<Item> CompareSome()
        {
            //求 方法
        }
    }
}

[偏爱风流]

各位大神，看过来啊

[全栈极简]

namespace CompareUtility
{
    class Program
    {
        static void Main(string[] args)
        {
            Compare c = new Compare();
            List<Item> list1 = c.CompareAdd();
            foreach (Item item in list1)
            {
                Console.WriteLine("{0},{1}", item.id, item.size);
            }

            List<Item> list2 = c.CompareSome();
            foreach (Item item in list2)
            {
                Console.WriteLine("{0},{1}", item.id, item.size);
            }
        }
    }

    public struct Item
    {
        public int id;
        public int size;
    }

    public class Compare
    {
        List<Item> lstA = new List<Item>();
        List<Item> lstB = new List<Item>();

        public Compare()
        {
            lstA.Add(new Item() { id = 1, size = 10 });
            lstA.Add(new Item() { id = 2, size = 10 });
            lstA.Add(new Item() { id = 3, size = 10 });
            lstA.Add(new Item() { id = 4, size = 10 });
            lstB.Add(new Item() { id = 1, size = 10 });
            lstB.Add(new Item() { id = 2, size = 10 });
            lstB.Add(new Item() { id = 3, size = 10 });
            lstB.Add(new Item() { id = 5, size = 10 });
        }

        /// <summary>
        /// 比较新增 即B有 A无
        /// </summary>
        public List<Item> CompareAdd()
        {
            return lstB.Except(lstA).ToList<Item>();
        }

        /// <summary>
        /// 比较相同 即A和B都有的
        /// </summary>
        public List<Item> CompareSome()
        {
            return lstB.Except(lstB.Except(lstA)).ToList<Item>();
        }
    }
}

[偏爱风流]

引用 2 楼 guwei4037 的回复:

namespace CompareUtility
{
    class Program
    {
        static void Main(string[] args)
        {
            Compare c = new Compare();
            List<Item> list1 = c.CompareAdd();
            foreach (Item item in list1)
            {
                Console.WriteLine("{0},{1}", item.id, item.size);
            }

            List<Item> list2 = c.CompareSome();
            foreach (Item item in list2)
            {
                Console.WriteLine("{0},{1}", item.id, item.size);
            }
        }
    }

    public struct Item
    {
        public int id;
        public int size;
    }

    public class Compare
    {
        List<Item> lstA = new List<Item>();
        List<Item> lstB = new List<Item>();

        public Compare()
        {
            lstA.Add(new Item() { id = 1, size = 10 });
            lstA.Add(new Item() { id = 2, size = 10 });
            lstA.Add(new Item() { id = 3, size = 10 });
            lstA.Add(new Item() { id = 4, size = 10 });
            lstB.Add(new Item() { id = 1, size = 10 });
            lstB.Add(new Item() { id = 2, size = 10 });
            lstB.Add(new Item() { id = 3, size = 10 });
            lstB.Add(new Item() { id = 5, size = 10 });
        }

        /// <summary>
        /// 比较新增 即B有 A无
        /// </summary>
        public List<Item> CompareAdd()
        {
            return lstB.Except(lstA).ToList<Item>();
        }

        /// <summary>
        /// 比较相同 即A和B都有的
        /// </summary>
        public List<Item> CompareSome()
        {
            return lstB.Except(lstB.Except(lstA)).ToList<Item>();
        }
    }
}

非常感谢，刚刚自己也把CompareAdd弄出来了，不过CompareSome还是不会，用惯了C++ struct的访问权限忘记了。