在List里面移除其中一个元素之后，原有的索引以及索引对应的值会发生改变，如果按照原有的索引值删除，就会误删除其它元素。

1.实现思路

原始List为A,将需要删除的元素放到一个List B里面，遍历此List，A再使用Remove依次移除元素。下面代码实现的是移除索引为前两位的元素

2.代码

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

namespace PracticeProject
{
    internal class Program
    {
        static void Main(string[] args)
        {
            ListTest();
            Console.ReadLine();

        }

        public static void ListTest()
        {
            //定义一个元素为Test的集合tests
            List<Test> tests = new List<Test>();
            //向List里面添加元素
            Test test = new Test();
            test.seq = 1; ;
            test.content = "第一";
            tests.Add(test);


            Test test1 = new Test();
            test1.seq = 2; ;
            test1.content = "第二";
            tests.Add(test1);


            Test test2 = new Test();
            test2.seq = 3; ;
            test2.content = "第三";
            tests.Add(test2);

            Test test3 = new Test();
            test3.seq = 4; ;
            test3.content = "第四";
            tests.Add(test3);
            Console.WriteLine("移除之前");
            for (int i = 0; i < tests.Count; i++)
            {
                Console.WriteLine(tests[i].seq + "  " + tests[i].content + " 序列号" + i);
            }
            tests.Remove(tests[1]);
            Console.WriteLine("移除索引为1的元素");
            for (int i = 0; i < tests.Count; i++)
            {
                Console.WriteLine(tests[i].seq + "  " + tests[i].content + " 序列号" + i);
            }

            //定义一个元素类型为Test的集合reamoveList，存放需要删除的元素
            List<Test> reamoveList = new List<Test>();
            int maxValue = tests[tests.Count - 1].seq - 2;
            for (int i = 0; i < tests.Count; i++)
            {
                if (tests[i].seq <= maxValue)
                {
                    reamoveList.Add(tests[i]);

                }
            }
            for (int i = 0; i < reamoveList.Count; i++)
            {
                //删除tests中的元素
                tests.Remove(reamoveList[i]);
            }
            Console.WriteLine("移除之后");
            for (int i = 0; i < tests.Count; i++)
            {
                Console.WriteLine(tests[i].seq + "  " + tests[i].content + " 序列号" + i);
            }
        }
    }
    public class Test
    {
        public int seq { get; set; }
        public string content { get; set; }
    }
}

3.运行结果