自定义Linq的Distinct

最新推荐文章于 2022-04-18 10:00:54 发布

转载最新推荐文章于 2022-04-18 10:00:54 发布 · 80 阅读

本文展示了一个使用 C# 的 Linq 技术来合并两个列表并去除重复项的例子。通过对自定义类 c111 的实例进行操作，演示了如何实现基于特定属性的去重功能。

代码

1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Windows.Forms;
9
10 namespace LinqTest
11 {
12     public partial class Form1 : Form
13     {
14         public Form1()
15         {
16             InitializeComponent();
17         }
18
19         private void button1_Click(object sender, EventArgs e)
20         {
21
22             List<c111> _c = new List<c111>();
23
24             _c.Add(new c111("1","2"));
25             _c.Add(new c111("11","22"));
26
27             List<c111> _c2=new List<c111>();
28             _c2.Add(new c111("1","3"));
29             _c2.Add(new c111("11","22"));
30
31             var vvv = (from o in _c
32                        select o).Concat((from c in _c2 select c)).Distinct(new DistinctPersons());
33
34
35         }
36
37
38
39     }
40
41     public class DistinctPersons : IEqualityComparer<c111>
42     {
43         public bool Equals(c111 x, c111 y)
44         {
45             if (x == null || y == null)    //optional
46             return false;
47             else
48             return x.a== y.a;
49         }
50         public int GetHashCode(c111 objPerson)
51         {
52             return objPerson.a.GetHashCode();
53         }
54     }
55
56
57     public class c111
58     {
59         public c111(string _a, string _b)
60         {
61             a = _a;
62             b = _b;
63         }
64         public string a
65         {
66             get;
67             set;
68         }
69         public string b
70         {
71             set;
72             get;
73         }
74     }
75 }
76