C#6.0语法糖

using System;
using static System.Math;//using static,仅仅引入类中的静态方法
namespace _6._0Syntax
{
    class Program
    {
         delegate bool Predicate(string str);
        static void Main(string[] args)
        {
            /*nameof 
             string a = nameof(Program.Main);
            */

            /*String interpolation
              var s = string.Format("{0} is so beauty{{~~~}}", "You");
            Person p = new Person { Name = "senki", Age = 12 };
            var s = $"{p.Name,20} is {p.Age:D3} year{{s}} old";
            */

            /*NULL操作            
            string str = null;
            int? length = str?.Length;
            char? c = str?[0];
            int l = str?.Length ?? 0;
            List<Person> list = null;
            int? b= list?[0]?.Name?.Length;
            Predicate predicate = null;
            if (predicate?.Invoke(str) ?? false)
            {
            }
            */

            /*初始化时设定索引
              var numbers = new Dictionary<int, string> {
                 [7]="liu",
                 [9]="zhan",
                 [15]="qi"
             };*/

            /* 异常过滤器
             try
             {
                 throw new CustomException();
             }
             catch (Exception e) when (IsCanCatch(e))
             {                 
             }
             */
            Max(1, 2);//通过using static,直接使用静态方法
            Console.WriteLine(1);
            Console.ReadLine();
        }

        //表达式函数
        static void Print(string str) => Console.WriteLine($"{str}");

        class Person 
        {
            public string Name { get; set; } = "senki";//自动属性初始值设定
            public bool Sex { get; } = true;
            public int Age { get; set; }
            public string LastName => Name;//只读属性
            public char this[int i]=>Name?[i]??'A';//索引
           

        }
        class CustomException : Exception
        {
            public override string Message
            {
                get
                {
                    return "测试异常";
                }
            }
        }
        private static bool IsCanCatch(Exception e)
        {
            if (e is CustomException)
                return true;
            return false;
        }

        struct School
        {
            public string Name { get; set; }
            public int Age { get; }
            public School(string name, int age)
            {
                Name = name;
                Age = age;
            }
            //public School():this("",120)
            //{ }

        }

         
}
}