using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public enum PartyRoleTypeEnum

    {

        Stdudent = 20,

        Teacher = 21,

        Manager = 22

     }

    public static void Main()

    {

        List<int> result = Enum.GetValues(typeof(PartyRoleTypeEnum))

                           .Cast<int>()

                           .ToList();

​

        foreach (var re in result)

        {

            Console.WriteLine(re);

        };

    }

}