c# - 从静态类中选择一个随机静态变量

Question

我有一个静态类中的静态变量列表。

namespace Test
{
  public static class Numbers
  {
    public static readonly int One = 1;
    public static readonly int Five = 5;
    public static readonly int Ten = 10;
    public static readonly int Eleven = 11;
    public static readonly int Fifteen= 15;
  }
}

我想在类(class)中随机选择一个变量。我怎样才能做到这一点？

int randomVariable = SomeFunction(Numbers);

Answer 1

使用反射:

FieldInfo[] fields= typeof(Numbers).GetFields(
   BindingFlags.Public | BindingFlags.Static);

var rnd = new Random();
int randomVariable = (int) fields[rnd.Next(fields.Length)].GetValue(null);

没有反射的更好解决方案:

创建一个整数数组 Numbers 作为静态属性并将其初始化为类 Numbers 中的值:

Numbers = fields.Select(f => (int)f.GetValue()).ToArray(); //int[]

然后在获取随机值时:

int randomVariable = Numbers[rnd.Next(Numbers.Length)];