IComparable<T> 与 IComparer<T>

var perspon= new List<Employee>
{
new Employee{EmployeeName="张三",20},
new Employee{EmployeeName="李四",23}
};

 person.Sort(); //这里实现了默认
 person.Sort(new SortName());
foreach(Employee item in person)
{
//打印输出
}

//IComparer<T> 实现自定义的比较器
public class SortName:IComparer<Employ>
{

public int  Compare( Employ x, Employ y)
{
return y.EmployeeName.CompareTo(x.EmployeeName);
}
}

//IComparable 实现了List的默认sort();
public class Employee:IComparable<Employee>
{
public Employee()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public string EmployeeName { get; set; }
public int Age { get; set; }

public int CompareTo(Employee emp)
{
return this.Age.CompareTo(emp.Age);
}
}