探讨:如何使用委托,匿名方法对集合进行万能排序

Ethel ·

更新时间:2024-11-14

· 895 次阅读

下面Demo中我使用了2种排序方式
1.让Employee继承IComparable 接口，实现CompareTo方法排序
2.定义一个方法使用Comparison<T>委托，排序的操作交给匿名方法
看完下面的代码，你知道使用Comparison<T>委托的好处吗？
代码如下:
    class Employee:IComparable
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public static List<Employee> GetEmployees()
        {
            return new List<Employee>()
            {
                new Employee(){Name ="GuoHu",Age =25},
                new Employee(){Name ="LeiHu",Age =23},
                new Employee(){Name ="JunWenLi",Age =24},
                new Employee(){Name ="JinHaoLiu",Age =25},
                new Employee(){Name ="ChengFang",Age =24}
            };
        }
        public int CompareTo(object obj)
        {
            Employee employee = obj as Employee;
            if (employee != null)
            {
                return Name.CompareTo(employee.Name);
            }
            else
            {
                throw new ArgumentException("obj is not Employee");
            }
        }
    }
    class Test
    {
        static void SortAndShowFiles(string title, Comparison<Employee> employeeInfo)
        {
            List<Employee> employee = Employee.GetEmployees();
            employee.Sort(employeeInfo);
            Console.WriteLine(title);
            foreach(Employee e in employee)
            {
                Console.WriteLine("Name:{0},Age:{1}", e.Name, e.Age);
            }
        }
        static void Main()
        {
            List<Employee> employeeInfo = Employee.GetEmployees();
            //Using IComparable sort
&nbs p;           employeeInfo.Sort();
            employeeInfo.ForEach(e => Console.WriteLine("Name:{0},Age{1}/t", e.Name, e.Age));
            SortAndShowFiles("Sort by name", delegate(Employee e1, Employee e2) { return e1.Name.CompareTo(e2.Name); });
            SortAndShowFiles("Sort by age", delegate(Employee e1, Employee e2) { return e1.Age.CompareTo(e2.Age); });
        }
    }

匿名方法万能方法排序

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