CLR中的枚举简称为常量。基础类型必须是整数。在Java中，枚举更像是类型的命名实例。该类型可能非常复杂，并且-如您的示例所示-包含多个不同类型的字段。
要将示例移植到C＃，我只需将枚举更改为不可变的类，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;
}
}
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