property 与 attribute 的区别?
一个是属性,用于存取类的字段,一个是特性,用来标识类,方法等的附加性质。
属性:
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class TimePeriod { private double seconds; public double Hours { get { return seconds / 3600; } set { seconds = value * 3600; } } } class Program { static void Main() { TimePeriod t = new TimePeriod(); // Assigning the Hours property causes the 'set' accessor to be called. t.Hours = 24; // Evaluating the Hours property causes the 'get' accessor to be called. System.Console.WriteLine("Time in hours: " + t.Hours); } } // Output: Time in hours: 24
特性:
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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. */