不從枚舉

Question

enum DaysInMonth 
    { 
     Jan = 31, Feb = 28, Mar = 31, Apr = 30, May = 31, Jun = 30, 
     Jul = 31, Aug = 31, Sep = 30, Oct = 31, Nov = 30, Dec = 31 
    }; 
DaysInMonth dm = DaysInMonth.Dec; 
     Console.WriteLine($"Number of days in {dm} is {dm:D}"); 

得到預期的結果獲得的天數在七月爲31，12月預計的天數是31

Answer 1

它不是硬編碼在一個月的天數是個好主意。閏年呢？

正確的方法得到天在一個月：

DateTime.DaysInMonth(year, month) 

Answer 2

您正在試圖利用枚舉的。所以請嘗試關注代碼。 [非唯一枚舉值]的

enum DaysInMonth 
     { 
      Jan = 31, Feb = 28, Mar = 31, Apr = 30, May = 31, Jun = 30, 
      Jul = 31, Aug = 31, Sep = 30, Oct = 31, Nov = 30, Dec = 31 
     }; 



static void Main(string[] args) 
     { 
      DaysInMonth dm = DaysInMonth.Dec; 
      Console.WriteLine("Number of days in {0} is {1} : ", dm, (int)dm); 
      Console.ReadKey(); 
     }