17.4.1 The AttributeUsage attribute
Visual Studio .NET 2003
The attribute AttributeUsage is used to describe the manner in which the attribute class can be used.
A class that is decorated with the AttributeUsage attribute must derive from System.Attribute, either directly or indirectly. Otherwise, a compile-time error occurs.
namespace System
{
[AttributeUsage(AttributeTargets.Class)]
public class AttributeUsageAttribute: Attribute
{
public AttributeUsageAttribute(AttributeTargets validOn) {...}
public virtual bool AllowMultiple { get {...} set {...} }
public virtual bool Inherited { get {...} set {...} }
public virtual AttributeTargets ValidOn { get {...} }
}
public enum AttributeTargets
{
Assembly = 0x0001,
Module = 0x0002,
Class = 0x0004,
Struct = 0x0008,
Enum = 0x0010,
Constructor = 0x0020,
Method = 0x0040,
Property = 0x0080,
Field = 0x0100,
Event = 0x0200,
Interface = 0x0400,
Parameter = 0x0800,
Delegate = 0x1000,
ReturnValue = 0x2000,
All = Assembly | Module | Class | Struct | Enum | Constructor |
Method | Property | Field | Event | Interface | Parameter |
Delegate | ReturnValue
}
}
