Java枚举实际上是一个完整的类，可以有一个私有构造函数和方法等，而c#枚举只是命名的整数。IMO Java的实现要优越得多。

当你从java营地学习c#时，这个页面应该会对你有很大的帮助。(该链接指向关于枚举的差异(向上/向下滚动查看其他内容)

我想是这样的:

public class Planets 
{
    public static readonly Planet MERCURY = new Planet(3.303e+23, 2.4397e6);
    public static readonly Planet VENUS = new Planet(4.869e+24, 6.0518e6);
    public static readonly Planet EARTH = new Planet(5.976e+24, 6.37814e6);
    public static readonly Planet MARS = new Planet(6.421e+23, 3.3972e6);
    public static readonly Planet JUPITER = new Planet(1.9e+27,   7.1492e7);
    public static readonly Planet SATURN = new Planet(5.688e+26, 6.0268e7);
    public static readonly Planet URANUS = new Planet(8.686e+25, 2.5559e7);
    public static readonly Planet NEPTUNE = new Planet(1.024e+26, 2.4746e7);
    public static readonly Planet PLUTO = new Planet(1.27e+22,  1.137e6);
}

public class Planet
{
    public double Mass {get;private set;}
    public double Radius {get;private set;}

    Planet(double mass, double radius)
    {
        Mass = mass;
        Radius = radius;
    }

    // universal gravitational constant  (m3 kg-1 s-2)
    private static readonly double G = 6.67300E-11;

    public double SurfaceGravity()
    {
        return G * Mass / (Radius * Radius);
    }

    public double SurfaceWeight(double otherMass)
    {
        return otherMass * SurfaceGravity();
    }
}

或者像上面那样将常量组合到Planet类中

在c#中，你可以在枚举上定义扩展方法，这弥补了一些缺失的功能。

您可以将Planet定义为枚举，也可以使用与surfaceGravity()和surfaceWeight()等效的扩展方法。

我已经按照Mikhail的建议使用了自定义属性，但是使用Dictionary也可以达到同样的效果。

using System;
using System.Reflection;

class PlanetAttr: Attribute
{
    internal PlanetAttr(double mass, double radius)
    {
        this.Mass = mass;
        this.Radius = radius;
    }
    public double Mass { get; private set; }
    public double Radius { get; private set; }
}

public static class Planets
{
    public static double GetSurfaceGravity(this Planet p)
    {
        PlanetAttr attr = GetAttr(p);
        return G * attr.Mass / (attr.Radius * attr.Radius);
    }

    public static double GetSurfaceWeight(this Planet p, double otherMass)
    {
        return otherMass * p.GetSurfaceGravity();
    }

    public const double G = 6.67300E-11;

    private static PlanetAttr GetAttr(Planet p)
    {
        return (PlanetAttr)Attribute.GetCustomAttribute(ForValue(p), typeof(PlanetAttr));
    }

    private static MemberInfo ForValue(Planet p)
    {
        return typeof(Planet).GetField(Enum.GetName(typeof(Planet), p));
    }

}

public enum Planet
{
    [PlanetAttr(3.303e+23, 2.4397e6)]  MERCURY,
    [PlanetAttr(4.869e+24, 6.0518e6)]  VENUS,
    [PlanetAttr(5.976e+24, 6.37814e6)] EARTH,
    [PlanetAttr(6.421e+23, 3.3972e6)]  MARS,
    [PlanetAttr(1.9e+27,   7.1492e7)]  JUPITER,
    [PlanetAttr(5.688e+26, 6.0268e7)]  SATURN,
    [PlanetAttr(8.686e+25, 2.5559e7)]  URANUS,
    [PlanetAttr(1.024e+26, 2.4746e7)]  NEPTUNE,
    [PlanetAttr(1.27e+22,  1.137e6)]   PLUTO
}

Java枚举实际上是一个完整的类，可以有一个私有构造函数和方法等，而c#枚举只是命名的整数。IMO Java的实现要优越得多。

当你从java营地学习c#时，这个页面应该会对你有很大的帮助。(该链接指向关于枚举的差异(向上/向下滚动查看其他内容)

CLR中的枚举被简单命名为常量。基础类型必须是整型。在Java中，枚举更像是类型的命名实例。该类型可能相当复杂，并且—如您的示例所示—包含多个不同类型的字段。

为了将这个例子移植到c#，我只需要将枚举更改为一个不可变的类，并公开该类的静态只读实例:

using System;
using System.Collections.Generic;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Planet planetEarth = Planet.MERCURY;

            double earthRadius = pEarth.Radius; // Just threw it in to show usage
            double earthWeight = double.Parse("123");
            double earthMass   = earthWeight / pEarth.SurfaceGravity();

            foreach (Planet p in Planet.Values)
                Console.WriteLine($"Your weight on {p} is {p.SurfaceWeight(mass)}");

            Console.ReadKey();
        }
    }

    public class Planet
    {
        public static readonly Planet MERCURY = new Planet("Mercury", 3.303e+23, 2.4397e6);
        public static readonly Planet VENUS   = new Planet("Venus", 4.869e+24, 6.0518e6);
        public static readonly Planet EARTH   = new Planet("Earth", 5.976e+24, 6.37814e6);
        public static readonly Planet MARS    = new Planet("Mars", 6.421e+23, 3.3972e6);
        public static readonly Planet JUPITER = new Planet("Jupiter", 1.9e+27, 7.1492e7);
        public static readonly Planet SATURN  = new Planet("Saturn", 5.688e+26, 6.0268e7);
        public static readonly Planet URANUS  = new Planet("Uranus", 8.686e+25, 2.5559e7);
        public static readonly Planet NEPTUNE = new Planet("Neptune", 1.024e+26, 2.4746e7);
        public static readonly Planet PLUTO   = new Planet("Pluto", 1.27e+22, 1.137e6);

        public static IEnumerable<Planet> Values
        {
            get
            {
                yield return MERCURY;
                yield return VENUS;
                yield return EARTH;
                yield return MARS;
                yield return JUPITER;
                yield return SATURN;
                yield return URANUS;
                yield return NEPTUNE;
                yield return PLUTO;
            }
        }

        public string Name   { get; private set; }
        public double Mass   { get; private set; }
        public double Radius { get; private set; }

        Planet(string name, double mass, double radius) => 
            (Name, Mass, Radius) = (name, mass, radius);

        // Wniversal gravitational constant  (m3 kg-1 s-2)
        public const double G = 6.67300E-11;
        public double SurfaceGravity()            => G * mass / (radius * radius);
        public double SurfaceWeight(double other) => other * SurfaceGravity();
        public override string ToString()         => name;
    }
}

我怀疑c#中的枚举只是CLR内部的常量，但不是很熟悉它们。我已经在Java中反编译了一些类，我可以告诉你想要的enum是一旦你转换。

Java做了一些狡猾的事情。它将枚举类视为一个普通类，在引用枚举值时使用大量宏。如果在使用枚举的Java类中有case语句，则它将枚举引用替换为整数。如果需要转到string，它会创建一个字符串数组，由它在每个类中使用的序数索引。我猜是为了节省拳击的费用。

如果你下载了这个反编译器，你会看到它如何创建它的类并集成它。说实话，相当吸引人。我过去不使用枚举类，因为我认为它对于一个常量数组来说太臃肿了。比起在c#中有限的使用方式，我更喜欢它。

http://members.fortunecity.com/neshkov/dj.html——Java反编译器