C# 匿名方法 委托 Action委托 Delegate委托

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Runtime.CompilerServices;
 5 using System.Security.Cryptography.X509Certificates;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8 
 9 namespace ConsoleTest
10 {
11     internal class Program
12     {
13         private static void Main(string[] args)
14         {
15             //Action封装一个方法，该方法只有一个参数并且不返回值。
               //更多实例见这里：https://msdn.microsoft.com/zh-cn/library/018hxwa8.aspx 
16             var dd = new Action<string>((item) =>
17             {
18                 var s = string.Concat("aa", item);
19                 Console.Write(s.ToString());
20             });
21 
22             dd("bb");
23 
24             Console.ReadKey();
25         }
26 
27 
28     }
29 }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleTest
{
    internal class Program
    {
        private delegate bool DelegateAge(int age);
        private static void Main(string[] args)
        {
            //lambda 表达式写法
            DelegateAge delegateAge1 = (age) => age > 30;

            DelegateAge delegateAge2 = (age) =>
            {
                return age > 30;
            };

            Console.WriteLine(delegateAge1(35));
            Console.WriteLine(delegateAge2(15));
            
            Console.ReadKey();
        }

    }
}

using System;

namespace ConsoleTest
{
    internal class Program
    {
        private delegate void Del();
        private static void Main(string[] args)
        {

            int n = 0;
            //没有参数的情况下可以这么玩
            Del d = () =>
            {
                System.Console.WriteLine("Copy #:{0}", ++n);
            };
            d();

            Console.ReadKey();
        }
    }
}

using System;
using System.IO;

namespace ConsoleTest
{
    internal class Program
    {
        private delegate void Del(int a,int b);
        private static void Main(string[] args)
        {
            //多个参数的情况下可以这么玩
            Del d = (a,b) =>
            {
                System.Console.WriteLine("a+b="+(a+b).ToString());
            };
            //也可以这么玩
            Del d2 = delegate(int a, int b)
            {
                System.Console.WriteLine("a+b=" + (a + b).ToString());
            };
            d(4, 7);
            d2(4, 7);
            Console.ReadKey();
        }
    }
}