C# 8新增语法

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  1 using System;
  2 using System.Collections.Generic;
  3 using System.Text;
  4 
  5 namespace ConsoleApp1
  6 {
  7     public class SharpEightInfo
  8     {
  9         public static void Show()
 10         {
 11             #region 默认接口方法
 12 
 13             CustomInterface custom = new CustomClass();
 14             custom.Show();
 15             custom.ShowInfo();
 16             #endregion
 17 
 18             #region Switch 表达式
 19             //老玩法
 20             string week = WeekToStringSwitch(WeekInfo.Monday);
 21             string week1 = WeekToStringSwitch(WeekInfo.Saturday);
 22             string week2 = WeekToStringSwitch(WeekInfo.Sunday);
 23 
 24             //新玩法
 25             string week3 = WeekToString(WeekInfo.Monday);
 26             string week4 = WeekToString(WeekInfo.Saturday);
 27             string week5 = WeekToString(WeekInfo.Thursday);
 28 
 29             //属性模式
 30             PropertyPattern property = new PropertyPattern
 31             {
 32                 Price = 10,
 33                 ProductName = "光盘"
 34             };
 35 
 36             var data = PropertyPatternShow(property);
 37             #endregion
 38 
 39         }
 40 
 41         public static string WeekToStringSwitch(WeekInfo week)
 42         {
 43             string result = default;
 44             switch (week)
 45             {
 46                 case WeekInfo.Monday:
 47                     result = "周一";
 48                     break;
 49                 case WeekInfo.Tuesday:
 50                     result = "周二";
 51                     break;
 52                 case WeekInfo.Wednesday:
 53                     result = "周三";
 54                     break;
 55                 case WeekInfo.Thursday:
 56                     result = "周四";
 57                     break;
 58                 case WeekInfo.Friday:
 59                     result = "周五";
 60                     break;
 61                 case WeekInfo.Saturday:
 62                     result = "周六";
 63                     break;
 64                 case WeekInfo.Sunday:
 65                     result = "周日";
 66                     break;
 67                 default:
 68                     result = "无法判断日期";
 69                     break;
 70             }
 71             return result;
 72         }
 73 
 74         public static string WeekToString(WeekInfo week) => week switch
 75         {
 76             WeekInfo.Monday => "周一",
 77             WeekInfo.Tuesday => "周二",
 78             WeekInfo.Wednesday => "周三",
 79             WeekInfo.Thursday => "周四",
 80             WeekInfo.Friday => "周五",
 81             WeekInfo.Saturday => "周六",
 82             WeekInfo.Sunday => "周日",
 83             _ => "无法判断日期"
 84         };
 85 
 86         public static double PropertyPatternShow(PropertyPattern property) => property switch
 87         {
 88             { ProductName: "光盘" } => property.Price * 0.5,
 89             { Price: 10 } => property.Price * 0.6,
 90             { ProductName: "碟子" } => property.Price * 0.7
 91         };
 92     }
 93 
 94     interface CustomInterface
 95     {
 96         public void Show();
 97         public void ShowInfo()
 98         {
 99             Console.WriteLine("我是方法ShowInfo");
100         }
101     }
102 
103     class CustomClass : CustomInterface
104     {
105         public void Show()
106         {
107             Console.WriteLine("我是方法Show");
108         }
109     }
110 
111     public enum WeekInfo
112     {
113         //周一
114         Monday,
115         //周二
116         Tuesday,
117         //周三
118         Wednesday,
119         //周四
120         Thursday,
121         //周五
122         Friday,
123         //周六
124         Saturday,
125         //周日
126         Sunday
127     }
128 
129     public class PropertyPattern
130     {
131         public string ProductName { get; set; }
132         public double Price { get; set; }
133     }
134 }

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