.net - Can you get merged attributes for a class in C#?

Question

Say I have the following set of classes, is it possible for the attributes of DerivedClass to be merged? Currently if I use the GetType().GetCustomAttributes()method passing in true for inheritance it takes the highest attributes in the inheritance structure.

i.e. [Another("Bob")] and [My(16)]

Is it possible for the attributes to be merged? So I would end up with two attributes of [My(16, "Male")] and [Another("Bob")]

I don't mean to say that I would specify an attribute of [My(16, "Male")] but rather I would be returned an attribute with an Age of 16 and a Gender of Male.

public class MyAttribute : Attribute
{

    public MyAttribute(int age)
    {
        Age = age;
    }

    public MyAttribute(int age, string gender)
    {
        Age = age;
        Gender = gender;
    }

    public int Age { get; set; }

    public string Gender { get; set; }

}

public class AnotherAttribute : Attribute
{

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

    public string Name { get; set; }

}

[My(12, "Male")]
[Another("Bob")]
public class BaseClass
{
}

[My(16)]
public class DerivedClass : BaseClass
{
}

Answer 1

You can have multiple instances of the same attribute on an entity (this is an option on the AttributeUsageAttribute applied to your attribute). When you get attributes on a type, you can get all the attributes applied to the inheritance chain.

However there is nothing in the standard tools that will take two attribute instances and make one.

(In theory a post processor that re-wrote the MSIL could do this.)