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C# 常用语法糖。

# Switch 表达式

  • 适用于 C#8.0 及以上版本
  • 示例 1：
p
string cardName = cardNumber switch
{
  13 => "King",
  12 = "Queen",
  11 => "Jack",
  _ => "Pip card" // 默认值
}
  • 示例 2：
Console.WriteLine(GetDiscountInPercent(DayOfWeek.Friday));  // output: 5.0
Console.WriteLine(GetDiscountInPercent(null));  // output: 0.0
Console.WriteLine(GetDiscountInPercent((DayOfWeek)10));  // output: 0.0
static decimal GetDiscountInPercent(DayOfWeek? dayOfWeek) => dayOfWeek switch
{
    DayOfWeek.Monday => 0.5m,
    DayOfWeek.Tuesday => 12.5m,
    DayOfWeek.Wednesday => 7.5m,
    DayOfWeek.Thursday => 12.5m,
    DayOfWeek.Friday => 5.0m,
    DayOfWeek.Saturday => 2.5m,
    DayOfWeek.Sunday => 2.0m,
    _ => 0.0m,
};