如何合并2时listItems

Question

我有2时listItems

1. 首先

   {Id = 1, Name = "a"}{Id = 2, Name = "b"}{Id = 3, Name = "c"} 
   

2. 二

   {Id = 2, Name = "b"}{Id = 3, Name = "c"}{Id = 4, Name = "d"} 
   

如何将它们合并，并得到一个列表项，如：

{Id = 1, Name = "a"}{Id = 2, Name = "b"}{Id = 3, Name = "c"}{Id = 4, Name = "d"} 

Answer 1

是这样的吗？

class items { 
      public int id; 
      public string name; 
      } 

static void Main(string[] args) 
     { 
      var list = new List<items>(); 
      list.Add(new items {id=1 , name="a"}); 
      list.Add(new items { id = 2, name = "b" }); 
      list.Add(new items { id = 3, name = "c" }); 

      var list1 = new List<items>(); 
      list1.Add(new items { id = 2, name = "b" }); 
      list1.Add(new items { id = 3, name = "c" }); 
      list1.Add(new items { id = 4, name = "d" }); 

      var c = list.Select(b=> new {b.id, b.name}); 
      var d = list1.Select(b => new { b.id, b.name }); 
      var merge = c.Concat(d).Distinct().ToList(); 

      foreach (var item in merge) 
      { 
       Console.WriteLine(item); 
      } 

      Console.ReadKey(); 
    } 

Answer 2

var list1 = new[]{new {Id = 1, Name = "a"},new {Id = 2, Name = "b"}, new{Id = 3, Name = "c"}}.ToList(); 
var list2 = new[]{new {Id = 1, Name = "a"},new {Id = 2, Name = "b"}, new{Id = 3, Name = "c"}}.ToList(); 

list1.AddRange(list2); 

然后list1是合并的列表。

Answer 3

您可以使用 “的AddRange” 或 “联盟” 或C＃ “的毗连” 功能

如

var list1 = new[]{new {Id = 1, Name = "a"},new {Id = 2, Name = "b"}, new{Id = 3, Name = "c"}}.ToList(); 

var list2 = new[]{new {Id = 1, Name = "a"},new {Id = 2, Name = "b"}, new{Id = 3, Name = "c"}}.ToList(); 

然后

var MergedResult = list1.Union(list2).ToList(); 

或

var MergedResult = list1.AddRange(list2).ToList(); 

你也可以使用Concat。 ...

查看它们之间的区别.NET List Concat vs AddRange