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探討:如何使用委托,匿名方法對集合進(jìn)行萬能排序

更新時間：2013年06月09日 08:44:43 作者：

本篇文章是對使用委托,匿名方法對集合進(jìn)行萬能排序進(jìn)行了詳細(xì)的分析介紹，需要的朋友參考下

下面Demo中我使用了2種排序方式
1.讓Employee繼承IComparable 接口，實現(xiàn)CompareTo方法排序
2.定義一個方法使用Comparison<T>委托，排序的操作交給匿名方法
看完下面的代碼，你知道使用Comparison<T>委托的好處嗎？

復(fù)制代碼代碼如下:

    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 
            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); });
        }

    }