List<object>进行Distinct()去重

有时我们会对一个list<T>集合里的数据进行去重，C#提供了一个Distinct()方法直接可以点得出来。如果list<T>中的T是个自定义对象时直接对集合Distinct是达不到去重的效果。我们需要新定义一个去重的类并继承IEqualityComparer接口重写Equals和GetHashCode方法，如下Demo

using System;
using System.Collections.Generic;
using System.Linq;

namespace MyTestCode
{
    /// <summary>
    /// Description of DistinctDemo.
    /// </summary>
    public class DistinctDemo
    {
        private static List<Student> list;
        public DistinctDemo()
        {
        }
        
        public static void init()
        {
            list = new List<Student>{
                new Student{
                    Id=1,
                    Name="xiaoming",
                    Age=22
                },
                new Student{
                    Id=2,
                    Name="xiaohong",
                    Age=23
                },
                new Student{
                    Id=2,
                    Name="xiaohong",
                    Age=23
                },
            };
        }
        
        public void Display()
        {
            list = list.Distinct(new ListDistinct()).ToList();
            foreach (var element in list) {
                Console.WriteLine(element.Id +"/"+element.Name+"/"+element.Age);
            }
        }
        
    }
    
    public class Student
    {
        public int Id{get;set;}
        public string Name{get;set;}
        public int Age{get;set;}
    }
    
    public class ListDistinct : IEqualityComparer<Student>
    {
        public bool Equals(Student s1,Student s2)
        {
            return (s1.Name == s2.Name);
        }
        
        public int GetHashCode(Student s)
        {
            return s==null?0:s.ToString().GetHashCode();
        }
    }
}