【转载】#470 Define Your Own Custom Attribute

You can use predefined attributes to attach metadata to type members.

You can also define a custom attribute by creating a new class inheriting from System.Attribute. The class name must end in "Attribute". You typically define a conostructor that takes arguments that consist of the metadata that you want to attach to the type membere.

 /// <summary>
 /// Attach to a class method to indicate kg of methane that is
 /// output when calling the method.
 /// </summary>
 public class MethaneFootprintAttribute : Attribute
 {
     public double kgMethane;

     public MethaneFootprintAttribute(int kg)
     {
         kgMethane = kg;
     }
 }

You can use the new attribute to attach metadata to individual type members. You use the name of the new class, without the trailing "Attribute".

 [MethaneFootprint()]
 public void FeedCowInBarn()
 {
     Console.WriteLine("Cow eats slop in dim confines of barn");
 }

 [MethaneFootprint()]
 public void LetGrazeOutside()
 {
     Console.WriteLine("Cow enjoys grazing and ends up healthier");
 }

原文地址：#470 Define Your Own Custom Attribute