using System;
using System.Reflection;

// An enumeration of animals. Start at 1 (0 = uninitialized).
public enum Animal
{
    // Pets.
    Dog = 1,
    Cat,
    Bird,
}

// A custom attribute to allow a target to have a pet.
public class AnimalTypeAttribute : Attribute
{
    // The constructor is called when the attribute is set.
    public AnimalTypeAttribute(Animal pet)
    {
        thePet = pet;
    }

    // Keep a variable internally ...
    protected Animal thePet;

    // .. and show a copy to the outside world.
    public Animal Pet
    {
        get { return thePet; }
        set { thePet = value; }
    }
}// A test class where each method has its own pet.
class AnimalTypeTestClass
{
    [AnimalType(Animal.Dog)]
    public void DogMethod() { }

    [AnimalType(Animal.Cat)]
    public void CatMethod() { }

    [AnimalType(Animal.Bird)]
    public void BirdMethod() { }
}

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            AnimalTypeTestClass testClass = new AnimalTypeTestClass();
            Type type = testClass.GetType();
            // Iterate through all the methods of the class.
            foreach (MethodInfo mInfo in type.GetMethods())
            {
                // Iterate through all the Attributes for each method.
                foreach (Attribute attr in Attribute.GetCustomAttributes(mInfo))
                {
                    // Check for the AnimalType attribute.
                    if (attr.GetType() == typeof(AnimalTypeAttribute))
                        Console.WriteLine(
                            "Method {0} has a pet {1} attribute.",
                            mInfo.Name, ((AnimalTypeAttribute)attr).Pet);
                }
            }
        }
    }
}