1、使用Linq中GroupBy去重
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;//using Newtonsoft.Json;namespace ConsoleApplication{ class Program { static void Main(string[] args) { List pList = new List(); People p1 = new People(1, "C", 4); People p2 = new People(2, "Java", 7); People p3 = new People(3, "Python", 11); People p4 = new People(4, "Linux", 15); People p5 = new People(5, "CJavaPY", 1); People p6 = new People(3, "Python", 11); People p7 = new People(4, "Linux", 15); People p8 = new People(5, "CJavaPY", 1); pList.Add(p1); pList.Add(p2); pList.Add(p3); pList.Add(p4); pList.Add(p5); pList.Add(p6); pList.Add(p7); pList.Add(p8); //string json= JsonConvert.SerializeObject(pList); //Console.WriteLine(json); /*[{"Id":1,"Name":"C","Age":4},{"Id":2,"Name":"Java","Age":7}, {"Id":3,"Name":"Python","Age":11},{"Id":4,"Name":"Linux","Age":15}, {"Id":5,"Name":"CJavaPY","Age":1},{"Id":3,"Name":"Python","Age":11}, {"Id":4,"Name":"Linux","Age":15},{"Id":5,"Name":"CJavaPY","Age":1}] */ //pList = JsonConvert.DeserializeObject>(json); var pList1 = pList.GroupBy(p => new { Id=p.Id,Age=p.Age,Name=p.Name }); foreach (var item in pList1) { Console.Write(item.Key); foreach (var item1 in item) { Console.Write(item1.Name); } Console.WriteLine(); } Console.ReadKey(); } } public class People { public People(int id, string name, int age) { this.Id = id; this.Name = name; this.Age = age; } public int Id { get; set; } public string Name { get; set; } public int Age { get; set; } }}
2、使用Linq中Distinct去重
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;//using Newtonsoft.Json;namespace ConsoleApplication{ class Program { static void Main(string[] args) { List pList = new List(); People p1 = new People(1, "C", 4); People p2 = new People(2, "Java", 7); People p3 = new People(3, "Python", 11); People p4 = new People(4, "Linux", 15); People p5 = new People(5, "CJavaPY", 1); People p6 = new People(3, "Python", 11); People p7 = new People(4, "Linux", 15); People p8 = new People(5, "CJavaPY", 1); pList.Add(p1); pList.Add(p2); pList.Add(p3); pList.Add(p4); pList.Add(p5); pList.Add(p6); pList.Add(p7); pList.Add(p8); //string json= JsonConvert.SerializeObject(pList); //Console.WriteLine(json); /*[{"Id":1,"Name":"C","Age":4},{"Id":2,"Name":"Java","Age":7}, {"Id":3,"Name":"Python","Age":11},{"Id":4,"Name":"Linux","Age":15}, {"Id":5,"Name":"CJavaPY","Age":1},{"Id":3,"Name":"Python","Age":11}, {"Id":4,"Name":"Linux","Age":15},{"Id":5,"Name":"CJavaPY","Age":1}] */ //pList = JsonConvert.DeserializeObject>(json); // pList.Distinct(); var pList1 = pList.Distinct(new PeopleComparer()); //pList.GroupBy(p => new { Id=p.Id,Age=p.Age,Name=p.Name }); foreach (var item in pList1) { Console.Write(item.Name); //foreach (var item1 in item) //{ // Console.Write(item1.Name); //} Console.WriteLine(); } Console.ReadKey(); } } public class PeopleComparer : IEqualityComparer { public bool Equals(People x, People y) { if (x == null) return y == null; return x.Id == y.Id && x.Name == y.Name && x.Age == y.Age; } public int GetHashCode(People obj) { if (obj == null) return 0; return obj.Id.GetHashCode(); } } public class People { public People(int id, string name, int age) { this.Id = id; this.Name = name; this.Age = age; } public int Id { get; set; } public string Name { get; set; } public int Age { get; set; } }}
3、使用foreach循环去重
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;//using Newtonsoft.Json;namespace ConsoleApplication{ class Program { static void Main(string[] args) { List pList = new List(); People p1 = new People(1, "C", 4); People p2 = new People(2, "Java", 7); People p3 = new People(3, "Python", 11); People p4 = new People(4, "Linux", 15); People p5 = new People(5, "CJavaPY", 1); People p6 = new People(3, "Python", 11); People p7 = new People(4, "Linux", 15); People p8 = new People(5, "CJavaPY", 1); pList.Add(p1); pList.Add(p2); pList.Add(p3); pList.Add(p4); pList.Add(p5); pList.Add(p6); pList.Add(p7); pList.Add(p8); //string json= JsonConvert.SerializeObject(pList); //Console.WriteLine(json); /*[{"Id":1,"Name":"C","Age":4},{"Id":2,"Name":"Java","Age":7}, {"Id":3,"Name":"Python","Age":11},{"Id":4,"Name":"Linux","Age":15}, {"Id":5,"Name":"CJavaPY","Age":1},{"Id":3,"Name":"Python","Age":11}, {"Id":4,"Name":"Linux","Age":15},{"Id":5,"Name":"CJavaPY","Age":1}] */ //pList = JsonConvert.DeserializeObject>(json); var pList1 = new List(); foreach (var item in pList) { if (pList1.Where(w => w.Id == item.Id && w.Name == item.Name && w.Age == item.Age).Count() == 0) pList1.Add(item); } foreach (var item in pList1) { Console.Write(item.Name); //foreach (var item1 in item) //{ // Console.Write(item1.Name); //} Console.WriteLine(); } Console.ReadKey(); } } public class People { public People(int id, string name, int age) { this.Id = id; this.Name = name; this.Age = age; } public int Id { get; set; } public string Name { get; set; } public int Age { get; set; } }}
