AttributeTargets Enumeración

Definición

Especifica los elementos de aplicación en los que se permite aplicar un atributo.Specifies the application elements on which it is valid to apply an attribute.

Esta enumeración tiene el atributo FlagsAttribute, que permite una combinación bit a bit de sus valores de miembro.

public enum class AttributeTargets
[System.Flags]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public enum AttributeTargets
type AttributeTargets = 
Public Enum AttributeTargets
Herencia
AttributeTargets
Atributos

Campos

All 32767

El atributo puede aplicarse a cualquier elemento de la aplicación.Attribute can be applied to any application element.

Assembly 1

El atributo puede aplicarse a un ensamblado.Attribute can be applied to an assembly.

Class 4

El atributo puede aplicarse a una clase.Attribute can be applied to a class.

Constructor 32

El atributo puede aplicarse a un constructor.Attribute can be applied to a constructor.

Delegate 4096

El atributo puede aplicarse a un delegado.Attribute can be applied to a delegate.

Enum 16

El atributo puede aplicarse a una enumeración.Attribute can be applied to an enumeration.

Event 512

El atributo puede aplicarse a un evento.Attribute can be applied to an event.

Field 256

El atributo puede aplicarse a un campo.Attribute can be applied to a field.

GenericParameter 16384

El atributo puede aplicarse a un parámetro genérico.Attribute can be applied to a generic parameter. Actualmente, este atributo puede aplicarse únicamente en C#, lenguaje intermedio de Microsoft (MSIL) y código emitido.Currently, this attribute can be applied only in C#, Microsoft intermediate language (MSIL), and emitted code.

Interface 1024

El atributo puede aplicarse a una interfaz.Attribute can be applied to an interface.

Method 64

El atributo puede aplicarse a un método.Attribute can be applied to a method.

Module 2

El atributo puede aplicarse a un módulo.Attribute can be applied to a module. Module hace referencia a un archivo portable ejecutable (archivo .dll o .exe) y no a un módulo estándar de Visual Basic.Module refers to a portable executable file (.dll or.exe) and not a Visual Basic standard module.

Parameter 2048

El atributo puede aplicarse a un parámetro.Attribute can be applied to a parameter.

Property 128

El atributo puede aplicarse a una propiedad.Attribute can be applied to a property.

ReturnValue 8192

El atributo puede aplicarse a un valor devuelto.Attribute can be applied to a return value.

Struct 8

El atributo puede aplicarse a una estructura, es decir, a un tipo de valor.Attribute can be applied to a structure; that is, a value type.

Ejemplos

En el ejemplo siguiente se muestra la aplicación de atributos a diversos destinos.The following example illustrates the application of attributes to various targets.

Nota

La sintaxis visual C++ y Visual Basic no admiten actualmente la aplicación de atributos a parámetros de tipo.Visual Basic and Visual C++ syntax currently do not support the application of attributes to type parameters.

using namespace System;

namespace AttTargsCS
{

   // This attribute is only valid on a class.

   [AttributeUsage(AttributeTargets::Class)]
   public ref class ClassTargetAttribute: public Attribute{};


   // This attribute is only valid on a method.

   [AttributeUsage(AttributeTargets::Method)]
   public ref class MethodTargetAttribute: public Attribute{};


   // This attribute is only valid on a constructor.

   [AttributeUsage(AttributeTargets::Constructor)]
   public ref class ConstructorTargetAttribute: public Attribute{};


   // This attribute is only valid on a field.

   [AttributeUsage(AttributeTargets::Field)]
   public ref class FieldTargetAttribute: public Attribute{};


   // This attribute is valid on a class or a method.

   [AttributeUsage(AttributeTargets::Class|AttributeTargets::Method)]
   public ref class ClassMethodTargetAttribute: public Attribute{};


   // This attribute is valid on any target.

   [AttributeUsage(AttributeTargets::All)]
   public ref class AllTargetsAttribute: public Attribute{};


   [ClassTarget]
   [ClassMethodTarget]
   [AllTargets]
   public ref class TestClassAttribute
   {
   private:

      [ConstructorTarget]
      [AllTargets]
      TestClassAttribute(){}


   public:

      [MethodTarget]
      [ClassMethodTarget]
      [AllTargets]
      void Method1(){}


      [FieldTarget]
      [AllTargets]
      int myInt;
      static void Main(){}

   };

}

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) {
        }
    }
}
Module DemoModule
    ' This attribute is only valid on a class.
    <AttributeUsage(AttributeTargets.Class)> _
    Public Class ClassTargetAttribute
        Inherits Attribute
    End Class

    ' This attribute is only valid on a method.
    <AttributeUsage(AttributeTargets.Method)> _
    Public Class MethodTargetAttribute
        Inherits Attribute
    End Class

    ' This attribute is only valid on a constructor.
    <AttributeUsage(AttributeTargets.Constructor)> _
    Public Class ConstructorTargetAttribute 
        Inherits Attribute
    End Class

    ' This attribute is only valid on a field.
    <AttributeUsage(AttributeTargets.Field)> _
    Public Class FieldTargetAttribute 
        Inherits Attribute
    End Class

    ' This attribute is valid on a class or a method.
    <AttributeUsage(AttributeTargets.Class Or AttributeTargets.Method)> _
    Public Class ClassMethodTargetAttribute 
        Inherits Attribute
    End Class

    ' This attribute is valid on any target.
    <AttributeUsage(AttributeTargets.All)> _
    Public Class AllTargetsAttribute 
        Inherits Attribute
    End Class

    <ClassTarget, _
    ClassMethodTarget, _
    AllTargets> _
    Public Class TestClassAttribute
        <ConstructorTarget, _
        AllTargets> _
        Public Sub New
        End Sub

        <MethodTarget, _
        ClassMethodTarget, _
        AllTargets> _
        Public Sub Method1()
        End Sub

        <FieldTarget, _
        AllTargets> _
        Public myInt as Integer
    End Class

    Sub Main()
    End Sub
End Module

Comentarios

La AttributeUsageAttribute clase utiliza esta enumeración para especificar el tipo de elemento en el que es válido aplicar un atributo.The AttributeUsageAttribute class uses this enumeration to specify the kind of element on which it is valid to apply an attribute.

AttributeTargetslos valores de enumeración se pueden combinar con una operación OR bit a bit para obtener la combinación preferida.AttributeTargets enumeration values can be combined with a bitwise OR operation to get the preferred combination.

Se aplica a

Consulte también: