using System;

public class MyAttribute : Attribute

{

    public MyAttribute()

    {

        Console.WriteLine("attr got created");

    }

}

​

[MyAttribute()]

public class A

{

}

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Create classes");

        new A();

        new A();

        Console.WriteLine("Create type");

        var t = typeof(A);

        Console.WriteLine("Ask for attributes first time");

        var attr = t.GetCustomAttributes(true);

        Console.WriteLine("Ask for attributes second time");

        var attr2 = t.GetCustomAttributes(true);

    }

}