如何在另一个枚举中设置枚举值？

Question

I want something like this.

public enum AgeGroup  
{  
    Teenager = new enum { FromAge = 16, ToAge = 17 },  
    young = new enum { FromAge = 18, ToAge = 24  }   
}

By this I want access it like AgeGroup.Teenager.FromDate .

Answer 1

A nested enum is not possible.

You can change your parent enum to a class, and it will work:

public class AgeGroup
{
    public enum Teegaer
    {
        FromAge = 16, ToAge = 17
    }

    public enum young
    {
        FromAge = 18, ToAge = 24
    }
}

Answer 2

An alternative approach is to create a static class :

public static class AgeGroup
{
   public static class TeenAge
   {
      public static readonly int FromAge = 16;
      public static readonly int ToAge = 17;
   }

  public static class YoungAge
   {
      public static readonly int FromAge = 18;
      public static readonly int ToAge = 21;
   }
}

Now you can refer to the variable, as below:

int teenAgeStarting = AgeGroup.TeenAge.FromAge  //16
int youngAgeStarting = AgeGroup.YoungAge.FromAge  //18

Implementation: DotNetFiddler