按顺序比较大小

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

namespace ConsoleApplication11
{
class Program
{
static void Main(string[] args)
{

Petss[] pet = new Petss[]{
new Petss(){name="张三",age=110},
new Petss(){name="张1三",age=11},
new Petss(){name="张2三",age=40}
};
Array.Sort(pet);
foreach (var item in pet)
{
Console.WriteLine(item.age);
}

Console.ReadKey();

int[] arr = { 1, 2, 3, 4, 5 };
//  arr.OrderBy()
// arr.OrderBy

}
}

class Petss : IComparable
{

public int age { set; get; }
public string name { set; get; }

public int CompareTo(object obj)
{
Petss p = (Petss)obj;
return p.age - this.age;

}
}
}