工作总结 c#如何将两个List集合合并

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            List<object> o1 = new List<object>() {
                " },
                " },
                " },
                " },
            };

            List<object> o2 = new List<object>() {
                " },
                " },
                " },
                " },
            };

            List<object> o3 = new List<object>() {
                " },
                " },
                " },
                " },
            };
            var arrcount = o1.Union(o2).Union(o3).ToList();
            var arrcounts = o1.Concat(o2).Concat(o3).ToList();

            string[] str = { "a", "b", "c", "d" };
            str.Where(n => n == "a");
            str.Where(n => n == "b");
            ");
            foreach (var item in str)
            {
                Console.WriteLine(item);
            }
        }
    }
}

https://bbs.csdn.net/topics/370079002

List<int> listA = new List<int> {1,2,3,5,7,9};

List<int> listB = new List<int> {13,4,17,29,2};

 

List<int> Result = listA.Union(listB).ToList<int>();          //剔除重复项

List<int> Result = listA.Concat(listB).ToList<int>();          //保留重复项

 

 

 

 

剔除重复项  会 全部属性匹配

第二个