获取自定义属性值

我需要获取自定义属性的值。我的要求几乎与此MSDN链接中给出的示例相似（如下所示）。

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() {}
}

class DemoClass {
    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);
            }

        }
    }
}
/*
 * Output:
 * Method DogMethod has a pet Dog attribute.
 * Method CatMethod has a pet Cat attribute.
 * Method BirdMethod has a pet Bird attribute.
 */

在上面的代码中，自定义属性被强制转换为其类型（AnimalTypeAttribute），然后获得其值。我有一个类似的场景，但是我没有自定义属性的引用，因此无法将其强制转换为获取其值。我可以获取属性节点，但是无法找到其最终值。在上面的示例中，属性为“ AnimalTypeAttribute”，其值为“ Dog”，“ Cat”，“ Bird”等。我能够找到属性节点“ AnimalTypeAttribute”，我现在需要的是值“狗”，“猫”等。有没有办法做到这一点？

其他信息（不确定是否会更改任何内容）：我正在创建自定义FxCop规则，并且节点类型为Microsoft.FxCop.Sdk.AttributeNode。

TIA。