using System;

public class ExtendGroup : Attribute

{

    public String Groupstr;

    public ExtendGroup(String groupstr)

    {

        this.Groupstr = groupstr;

    }

}

​

interface ISheisse

{

    public void BigData();

}

​

class BigDataClass : ISheisse

{

    [ExtendGroup("NoHomo")]

    public void BigData()

    {   

    }

}

​

class Program

{

    public static void Main()

    {

        var bigdata = new BigDataClass();

        Bongo(bigdata);

    }

    public static void Bongo(ISheisse cheez)

    {

        Attribute[] attrs = Attribute.GetCustomAttributes(cheez.GetType().GetMethod("BigData"), false);

        foreach (Attribute attr in attrs)

        {

            if (attr is ExtendGroup ex)

            {

                Console.WriteLine("It demands a passphrase set by {0}", ex.Groupstr);

            }

        }

    }

}