对一个集合按对象不同属性进行排序

对于某个集合，我们需要对其按对象不同属性进行排序，对于在查询数据时遇到这样的情况，一些sql语句就能解决，当然我们也可以把数据查出来自己经过循环判断之后也能实现，今天这里介绍一种比较简单的方法，在定义对象时，只需要实现IComparable接口，去重写一下里面的CompareTo方法就可以了，如果希望有更强大的功能，可以参考我以前写的http://zxlyecf2.iteye.com/blog/1977948；对于习惯使用Linq的实现起来就跟简单了

 

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

namespace CustomListTest.Students
{
    public class Student : IComparable<Student>
    {
        public Student(string n, string g, int i)
        {
            name = n;
            gender = g;
            id = i;
        }

        public string name
        {
            get;
            set;
        }

        public string gender
        {
            get;
            set;
        }

        public int id
        {
            get;
            set;
        }

        public int CompareTo(Student other)
        {
            //name降序,id升序，若要改变顺序只需修改一下other.name和name的前后顺序
            if (other.name.CompareTo(name) == 0)
            {
                return id.CompareTo(other.id);
            }
            else
            {
                return other.name.CompareTo(name);
            }
        }
    }
}

 

    Student songchao = new Student("SongChao", "Man", 100150);
            Student wuxing = new Student("WuXing", "Women", 100121);
            Student songchao2 = new Student("SongChao", "Women", 100130);
            Student aa = new Student("aa", "Women", 100133);
            Student aa2 = new Student("aa", "Women", 100130);

            List<Student> students = new List<Student>();
            students.Add(songchao);
            students.Add(wuxing);
            students.Add(songchao2);
            students.Add(aa);
            students.Add(aa2);

            foreach (Student student in students)
            {
                Console.WriteLine("Name  " + student.name + " ID  " + student.id);
            }
            Console.WriteLine("");

            students.Sort();
            foreach (Student student in students)
            {
                Console.WriteLine("Name  " + student.name + " ID  " + student.id);
            }

            ////使用Linq更简单实现
            //var ss = from u in students orderby u.name descending, u.id ascending select u;
            //foreach (Student student in ss)
            //{
            //    Console.WriteLine("Name  " + student.name + " ID  " + student.id);
            //}
            Console.Read();