如下所示：
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
namespace hgoApp
{
class Comparer
{
static void Main()
{
Employee[] Employees = new Employee[5];
Employees[0] = new Employee("张三", 2800);
Employees[1] = new Employee("李四", 1800);
Employees[2] = new Employee("王五", 5800);
Employees[3] = new Employee("马六", 12800);
Employees[4] = new Employee("钱七", 8800);
Console.WriteLine("按照姓名排序");
Array.Sort(Employees);
foreach (Employee em in Employees)
{
Console.WriteLine(em);
}
Console.WriteLine("按照薪水排序");
Array.Sort(Employees, Employee.SalaryCom);
foreach (Employee em in Employees)
{
Console.WriteLine(em);
}
}
}
class Employee : IComparable
{
private string _Name;
public string Name
{
get { return _Name; }
}
private int _Salary;
public int Salary
{
get { return _Salary; }
}
public Employee(string Name, int Salary)
{
_Name = Name;
_Salary = Salary;
}
//显示接口实现
int IComparable.CompareTo(object obj)
{
if (!(obj is Employee))
{
throw new ArgumentException("不是Employee类");
}
return _Name.CompareTo(((Employee)obj)._Name);
}
//提供一个公用的强类型重载版本
public int CompareTo(Employee Em)
{
return _Name.CompareTo(Em._Name);
}
//当第一次实例化Employee的时候,_SalaryCom为空,当使用SalaryCom时,就会创建一个SalaryCompare对象,第2次，3次的时候,就可以直接使用_SalaryCom了
private static SalaryCompare _SalaryCom = null;
public static IComparer SalaryCom
{
get
{
if (_SalaryCom == null)
{
_SalaryCom = new SalaryCompare();
}
return _SalaryCom;
}
}
//嵌套类(这个类是针对薪水进行排序的类)
private class SalaryCompare:IComparer
{
//使用指定的IComparer对Array中的元素进行排序
int IComparer.Compare(object obj1,object obj2)
{
if (!(obj1 is Employee) || !(obj2 is Employee))
{
throw new ArgumentException("不是Employee类");
}
return ((Employee)obj1)._Salary.CompareTo(((Employee)obj2)._Salary);
}
}
public override string ToString()
{
return _Name +" "+ _Salary.ToString();
}
}
}
