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  • C#创建委托实例

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
     
    namespace MyDelegate
    {
        class Program
        {
            static void Main(string[] args)
            {
                List<User> users = GetUsers();
     
                //1.传统方式实例化委托实例
                users = users.OrderBy(new Func<User, int>(OrderType)).ToList();
     
                //2.委托参数采用匿名函数代替函数名
                users = users.OrderBy(new Func<User, int>(delegate(User user)
                {
                    return user.Number;
                })).ToList();
     
                ////3.匿名函数直接创建委托实例
                users = users.OrderBy(delegate(User user)
                {
                    return user.Number;
                }).ToList();
     
                ////4.lambda表达式本质:用于创建委托的匿名函数
                users = users.OrderBy(user => user.Number).ToList();
     
     
                //输出
                users.ForEach(x =>
                {
                    Console.WriteLine("Number{0}:Name{1}:Age:{2}", x.Number, x.Name, x.Age);
                });
     
                //暂停
                Console.Read();
            }
     
     
            /// <summary>
            /// 排序方式
            /// </summary>
            /// <param name="arg"></param>
            /// <returns></returns>
            private static int OrderType(User user)
            {
                return user.Number;  //按照编号排序
            }
     
            private static List<User>  GetUsers()
            {
                List<User> users = new List<User>();
                User user1 = new User(3, "张三", 19);
                User user2 = new User(2, "李四", 27);
                User user3 = new User(1, "王五", 12);
                users.Add(user1);
                users.Add(user2);
                users.Add(user3);
                return users;
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/hdwang/p/3922121.html
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