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  • C# 6新语法

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     1 using System;
     2 
     3 namespace ConsoleApp1
     4 {
     5     class Program
     6     {
     7         static void Main(string[] args)
     8         {
     9 
    10             {
    11                 Student student = new Student("蛋蛋", "");
    12 
    13                 Console.WriteLine(student.ToString());
    14 
    15                 student.Show();
    16             }
    17 
    18             {
    19                 //条件运算符
    20                 Student student1 = null;
    21 
    22                 //1. 得到的结果一定要支持null
    23                 //2. 如果 student1 是 null,返回 null,如果 student1 有值 就返回 student1.FirstName
    24                 string fullName = student1?.FirstName;
    25 
    26                 //必须为可空类型,如果是  int id = student1?.Id; 则报错
    27                 int? id = student1?.Id;
    28 
    29                 Console.WriteLine("Hello World!");
    30 
    31                 student1 = new Student("AA", "BB");
    32                 fullName = student1?.FullName1;
    33 
    34                 //1. 判断student1是否为null,如果为null,直接返回null;
    35                 //2. 如果不为null,判断 student1.FullName1 是否为null,如果为null,返回“张三”,如果不为null,返回 student1.FullName1
    36                 string testName = student1?.TestName ?? "张三";
    37             }
    38 
    39             //字符串内插
    40             {
    41                 string firstName = "蛋蛋";
    42                 string lastName = "";
    43                 string strs = $"{{{lastName}}}-{firstName}"; //结果:{张}-蛋蛋
    44             }
    45 
    46             //异常筛选器
    47             {
    48                 try
    49                 {
    50                     throw new Exception("我是张蛋蛋的好朋友!");
    51                 }catch(Exception ex) when(ex.Message.Contains("张蛋蛋"))
    52                 {
    53                     Console.WriteLine("如果异常Message字符串中包含‘张蛋蛋’,那么就会显示此段话!");
    54                     //throw;
    55                 }
    56             }
    57             //nameof 表达式
    58             {
    59 
    60                 string className = nameof(Student);
    61                 Console.WriteLine($"获取到类名称:{className}");
    62             }
    63 
    64         }
    65     }
    66 }
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    复制代码
     1 using System;
     2 using System.Collections.Generic;
     3 using System.Text;
     4 
     5 namespace ConsoleApp1
     6 {
     7    public class Student
     8     {
     9         public Student(string firstName,string lastName)
    10         {
    11             FirstName = firstName;
    12             LastName = lastName;
    13         }
    14 
    15         public int? Id { get; set; }
    16         public string TestName { get; set; }
    17 
    18         /// <summary>
    19         /// 只能通过构造函数赋值
    20         /// </summary>
    21         public string FirstName { get; }
    22         public string LastName { get; }
    23 
    24         /// <summary>
    25         /// FullName1 与 FullName2 功能相同
    26         /// </summary>
    27         public string FullName1
    28         {
    29             get
    30             {
    31                 return string.Format("{0}-{1}", this.FirstName, this.LastName);
    32             }
    33         }
    34 
    35         public string FullName2=> string.Format("{0}-{1}", this.FirstName, this.LastName);//念 goes to
    36 
    37         public void Show()
    38         {
    39             Console.WriteLine(string.Format("FullName1:{0}",FullName1));
    40             Console.WriteLine(string.Format("FullName2:{0}", FullName2));
    41         }
    42 
    43         /// <summary>
    44         /// 方法A (方法A与方法B功能相同)
    45         /// </summary>
    46         /// <returns></returns>
    47         public override string ToString() => string.Format("我是方法:{0}-{1}", this.FirstName, this.LastName);//念 goes to
    48         /// <summary>
    49         /// 方法B
    50         /// </summary>
    51         /// <returns></returns>
    52         //public override string ToString()
    53         //{
    54         //    return string.Format("我是方法:{0}-{1}", this.FirstName, this.LastName);
    55         //}
    56 
    57     }
    58 }
    复制代码



    出处:https://www.cnblogs.com/zhuxs-blog/p/14483391.html


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