AttributeTargets AttributeTargets AttributeTargets AttributeTargets Enum

Definice

Určuje prvky aplikace, na kterých je platný pro použití atributu.Specifies the application elements on which it is valid to apply an attribute.

Tento výčet má atribut FlagsAttribute, který umožňuje bitové kombinace hodnot členů.

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

Pole

All All All All 32767

Atribut lze použít pro libovolný element aplikace.Attribute can be applied to any application element.

Assembly Assembly Assembly Assembly 1

Atribut lze použít pro sestavení.Attribute can be applied to an assembly.

Class Class Class Class 4

Atribut lze použít pro třídu.Attribute can be applied to a class.

Constructor Constructor Constructor Constructor 32

Atribut lze použít pro konstruktor.Attribute can be applied to a constructor.

Delegate Delegate Delegate Delegate 4096

Atribut lze použít pro delegáta.Attribute can be applied to a delegate.

Enum Enum Enum Enum 16

Atribut lze použít pro výčet.Attribute can be applied to an enumeration.

Event Event Event Event 512

Atribut lze použít pro událost.Attribute can be applied to an event.

Field Field Field Field 256

Atribut lze použít pro pole.Attribute can be applied to a field.

GenericParameter GenericParameter GenericParameter GenericParameter 16384

Atribut lze použít pro obecný parametr.Attribute can be applied to a generic parameter. V současné době lze tento atribut použít pouze v C#, v jazyce MSIL (Microsoft Intermediate Language) a emited Code.Currently, this attribute can be applied only in C#, Microsoft intermediate language (MSIL), and emitted code.

Interface Interface Interface Interface 1024

Atribut lze použít na rozhraní.Attribute can be applied to an interface.

Method Method Method Method 64

Atribut lze použít pro metodu.Attribute can be applied to a method.

Module Module Module Module 2

Atribut lze použít pro modul.Attribute can be applied to a module. Moduleodkazuje na přenositelné spustitelné soubory (. dll nebo. exe), nikoli na modul Visual Basic Standard.Module refers to a portable executable file (.dll or.exe) and not a Visual Basic standard module.

Parameter Parameter Parameter Parameter 2048

Atribut lze použít pro parametr.Attribute can be applied to a parameter.

Property Property Property Property 128

Atribut lze použít pro vlastnost.Attribute can be applied to a property.

ReturnValue ReturnValue ReturnValue ReturnValue 8192

Atribut lze použít pro návratovou hodnotu.Attribute can be applied to a return value.

Struct Struct Struct Struct 8

Atribut lze použít pro strukturu; To znamená typ hodnoty.Attribute can be applied to a structure; that is, a value type.

Příklady

Následující příklad znázorňuje použití atributů na různé cíle.The following example illustrates the application of attributes to various targets.

Poznámka

Syntaxe Visual Basic a C++ vizuálu aktuálně nepodporují použití atributů u parametrů typu.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) {
        }
    }
}
Imports System

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

Poznámky

AttributeUsageAttribute Třída používá tento výčet k určení druhu prvku, na kterém je platný pro použití atributu.The AttributeUsageAttribute class uses this enumeration to specify the kind of element on which it is valid to apply an attribute.

AttributeTargetshodnoty výčtu lze kombinovat s bitovým nebo operací, aby bylo možné získat upřednostňovanou kombinaci.AttributeTargets enumeration values can be combined with a bitwise OR operation to get the preferred combination.

Platí pro

Viz také