【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(45)]
public void FeedCowInBarn()
{
    Console.WriteLine("Cow eats slop in dim confines of barn");
}
 
[MethaneFootprint(29)]
public void LetGrazeOutside()
{
    Console.WriteLine("Cow enjoys grazing and ends up healthier");
}

原文地址：#470 Define Your Own Custom Attribute