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(, "张三", );
User user2 = new User(, "李四", );
User user3 = new User(, "王五", );
users.Add(user1);
users.Add(user2);
users.Add(user3);
return users;
}
}
}