C#6.0 新功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApp2
{
    class Program
    {
 
        static void Main(string[] args)
        {
 
            Console.WriteLine("输入姓：");
            var lastName = Console.ReadLine();
            Console.WriteLine("输入名：");
 
            var firstName = Console.ReadLine();
            //string format 新写法
            var student = new Student(firstName,lastName);
 
            Console.WriteLine($"student.ToString(){ student.ToString()}");
            Console.WriteLine($"student.FullName{ student.FullName}");
 
            Console.WriteLine("C#6.0新特性");
 
            student = new Student(null,null);
 
            Console.WriteLine($"student.ToString(){ student.ToString()}");
            Console.WriteLine($"student.FullName{ student?.FullName}");
            Console.WriteLine($"student.Grades{ student.Grades.Count}");
 
           //异常过滤
            try
            {
                throw new Exception("测试异常filter");
 
            }
            catch (Exception e) when( e.Message.Contains("filter"))
            {
 
                Console.WriteLine(e.Message);
                throw;
            }
            //catch (Exception e) when (e.LogException())
            //{
            //    // This is never reached!
            //}
 
            Console.WriteLine("C#6.0新特性");
 
            Console.ReadKey();
 
        }
 
        public class Student
        {
            public string LastName {get;}
            public string FirstName { get; }
 
            public Student(string firstName, string lastName)
            {
                LastName = lastName;
                FirstName = firstName;
            }
 
            public void SetName(string firstName, string lastName)
            {
               //this. LastName = lastName;
               //this.FirstName = firstName;
            }
            //方法表达式
            public ICollection<double> Grades { get; } = new List<double>();
 
            public string GetFormattedGradePoint() =>
$"Name: {LastName}, {FirstName}. G.P.A: {Grades.Average():F2}";
            public override string ToString() => $"{LastName},{FirstName}";
 
            public string  FullName=>  $"{LastName},{FirstName}";
        }
    }
}