AttributeUsage

Determines how a custom attribute class can be used. AttributeUsage is an attribute that can be applied to custom attribute definitions to control how the new attribute can be applied. The default settings look like this when applied explicitly:

C#

VB

[System.AttributeUsage(System.AttributeTargets.All,
                   AllowMultiple = false,
                   Inherited = true)]
class NewAttribute : System.Attribute { }

In this example, the NewAttribute class can be applied to any attribute-able code entity, but can be applied only once to each entity. It is inherited by derived classes when applied to a base class.