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AttributeTargets Enum

Definition

Specifies the application elements on which it is valid to apply an attribute.

This enumeration supports a bitwise combination of its member values.

[System.Flags]
public enum AttributeTargets
[System.Flags]
[System.Serializable]
public enum AttributeTargets
[System.Flags]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public enum AttributeTargets
Inheritance
AttributeTargets
Attributes

Fields

Name Value Description
Assembly 1

Attribute can be applied to an assembly.

Module 2

Attribute can be applied to a module. Module refers to a portable executable file (.dll or.exe) and not a Visual Basic standard module.

Class 4

Attribute can be applied to a class.

Struct 8

Attribute can be applied to a structure; that is, a value type.

Enum 16

Attribute can be applied to an enumeration.

Constructor 32

Attribute can be applied to a constructor.

Method 64

Attribute can be applied to a method.

Property 128

Attribute can be applied to a property.

Field 256

Attribute can be applied to a field.

Event 512

Attribute can be applied to an event.

Interface 1024

Attribute can be applied to an interface.

Parameter 2048

Attribute can be applied to a parameter.

Delegate 4096

Attribute can be applied to a delegate.

ReturnValue 8192

Attribute can be applied to a return value.

GenericParameter 16384

Attribute can be applied to a generic parameter. Currently, this attribute can be applied only in C#, Microsoft intermediate language (MSIL), and emitted code.

All 32767

Attribute can be applied to any application element.

Examples

The following example illustrates the application of attributes to various targets.

Notes

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) {
        }
    }
}

Remarks

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.

Applies to

Produit Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1
UWP 10.0

See also