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(, );//通过using static,直接使用静态方法
             Console.WriteLine();
             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)
             //{ }

         }

 }
 }