property 与 attribute 的区别？

using System;
using System.Reflection;

namespace CustomAttrCS
{
// 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 = Pet; }
}
}

// 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.
*/