csharp attributes allow arrays

output.txt

A
B
C

Program.cs

using System;
using System.Reflection;

class Program
{
    static void Main(string[] args)
    {
        foreach (var value in typeof(MyClass).GetCustomAttribute<MyAttribute>().Values)
        {
            Console.WriteLine(value);
        }
    }
}

[My("A", "B", "C")]
class MyClass
{
}

class MyAttribute : Attribute
{
    public string[] Values { get; }

    public MyAttribute(params string[] values)
    {
        Values = values;
    }
}