AttributeTargets Enumeration
Specifies the application elements on which it is valid to apply an attribute.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: SystemAssembly: mscorlib (in mscorlib.dll)
| Member name | Description | |
|---|---|---|
  | Assembly | Attribute can be applied to an assembly. |
| Module | Attribute can be applied to a module.Note Module refers to a portable executable file (.dll or.exe) and not a Visual Basic standard module. |
| Class | Attribute can be applied to a class. |
| Struct | Attribute can be applied to a structure; that is, a value type. |
| Enum | Attribute can be applied to an enumeration. |
| Constructor | Attribute can be applied to a constructor. |
| Method | Attribute can be applied to a method. |
| Property | Attribute can be applied to a property. |
| Field | Attribute can be applied to a field. |
| Event | Attribute can be applied to an event. |
| Interface | Attribute can be applied to an interface. |
| Parameter | Attribute can be applied to a parameter. |
| Delegate | Attribute can be applied to a delegate. |
| ReturnValue | Attribute can be applied to a return value. |
| GenericParameter | Attribute can be applied to a generic parameter.Note Currently, this attribute can be applied only in C#, Microsoft intermediate language (MSIL), and emitted code. |
| All | Attribute can be applied to any application element. |
The AttributeUsageAttribute class uses this enumeration to specify the kind of element on which it is valid to apply an attribute.
AttributeTargets enumeration values can be combined with a bitwise OR operation to get the preferred combination.
The following example illustrates the application of attributes to various targets.
| Note |
|---|
Visual Basic and Visual C++ syntax currently do not support the application of attributes to type parameters. |
using System; namespace AttTargsCS { // This attribute is only valid on a class. [AttributeUsage(AttributeTargets.Class)] public class ClassTargetAttribute : Attribute { } // This attribute is only valid on a method. [AttributeUsage(AttributeTargets.Method)] public class MethodTargetAttribute : Attribute { } // This attribute is only valid on a constructor. [AttributeUsage(AttributeTargets.Constructor)] public class ConstructorTargetAttribute : Attribute { } // This attribute is only valid on a field. [AttributeUsage(AttributeTargets.Field)] public class FieldTargetAttribute : Attribute { } // This attribute is valid on a class or a method. [AttributeUsage(AttributeTargets.Class|AttributeTargets.Method)] public class ClassMethodTargetAttribute : Attribute { } // This attribute is valid on a generic type parameter. [AttributeUsage(AttributeTargets.GenericParameter)] public class GenericParameterTargetAttribute : Attribute { } // This attribute is valid on any target. [AttributeUsage(AttributeTargets.All)] public class AllTargetsAttribute : Attribute { } [ClassTarget] [ClassMethodTarget] [AllTargets] public class TestClassAttribute { [ConstructorTarget] [AllTargets] TestClassAttribute() { } [MethodTarget] [ClassMethodTarget] [AllTargets] public void Method1() { } [FieldTarget] [AllTargets] public int myInt; public void GenericMethod< [GenericParameterTarget, AllTargets] T>(T x) { } static void Main(string[] args) { } } }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
