Is it possible to obtain a parent attribute when the class defines the child attribute?

Question

Assuming I have the following hierarchy:

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
public class GrandpaAttribute : Attribute
{
    public GrandpaAttribute() {}
}

public class ParentAttribute() : GrandpaAttribute
{
    public string Name { get; }

    public ParentAttribute(string name)
    {
        Name = name;
    }
}

public class ChildAttribute() : ParentAttribute
{
    public int Number { get; }

    public ChildAttribute(string name, int number) : base(name)
    {
        Number = number;
    }
}

In a certain application, I use the attribute ChildAttribute:

public class Foo
{
    [Child("The Beast", 666)]
    public string Description { get; set; }
    public DateTime SomeDate { get; set; }
}

The doubt arose:

It is possible to abstract heritage to understand that property Description has the attribute GrandpaAttribute?

My intention is to obtain an instance of GrandaAttribute defined in a class property Foo as ParentAttribute, ChildAttribute or any other attribute derived from it.

Answer 1

From what I understand, you want to, get into the class instance GrandpaAttribute, for test reasons I added a property First for the test to be performed, first the real instance is sought, and then with a cast arrives in class GrandpaAttribute, example:

using System;
using System.Reflection;

[System.AttributeUsage(AttributeTargets.Property,AllowMultiple=false, Inherited=true)]
public class GrandpaAttribute : Attribute
{
    public GrandpaAttribute() 
    {
        First = "Teste";
    }
    public string First {get;set;} 
}

public class ParentAttribute : GrandpaAttribute
{
    public string Name { get; private set; }

    public ParentAttribute(string name)
    {
        Name = name;
    }
}

public class ChildAttribute : ParentAttribute
{
    public int Number { get; private set; }

    public ChildAttribute(string name, int number) 
        : base(name)
    {
        Number = number;
    }
}

public class Foo
{
    [Child("The Beast", 666)]
    public string Description { get; set; }
    public DateTime SomeDate { get; set; }
}

public class Program
{
    public static void Main()
    {
        ChildAttribute childAttribute = typeof(Foo)
                .GetProperty("Description")
                .GetCustomAttribute<ChildAttribute>(true);      


        Console.WriteLine(((GrandpaAttribute)childAttribute).First);
    }
}

An Online Dotnetfiddle Example