C# Lambda

匿名函数

delegate void StudentDelegate(string name, int age);
    class Program
    {
        static void Main(string[] args)
        {
            
        }
        public void show()
        {
            DateTime dateTime = DateTime.Now;
            //历史
            //版本1
            {
                StudentDelegate student = new StudentDelegate(Student);
            }
            //版本2(这样写的话可以访问局部变量)
            {
                StudentDelegate student = new StudentDelegate(delegate (string name, int age)
                {
                    Console.WriteLine(dateTime);
                    Console.WriteLine($"我的名字是{name},年龄是{age}");
                });
                student("名字", 1);
            }
            //版本3(=>念成goes to)
            {
                StudentDelegate student = new StudentDelegate((string name, int age)=>
                {
                    Console.WriteLine(dateTime);
                    Console.WriteLine($"我的名字是{name},年龄是{age}");
                });
                student("名字", 1);
            }
            {
                Action action = () => Console.WriteLine("无返回值，无参数");
                
                Action<DateTime> action1 = d => { Console.WriteLine(d + "带一个参数"); };
                
                Func<DateTime> func = () => { return DateTime.Now; };//带一个返回值
                DateTime dateTime1 = func();//调用Lambda获取值

                Func<DateTime> func1 = () => DateTime.Now;
            }
        }
        public static void Student(string name ,int age )
        {
            Console.WriteLine($"我的名字是{name},年龄是{age}");
        }
    }
}