AttributeUsageAttribute(AttributeTargets) Constructor
Definition
Important
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Initializes a new instance of the AttributeUsageAttribute class with the specified list of AttributeTargets, the AllowMultiple value, and the Inherited value.
public:
AttributeUsageAttribute(AttributeTargets validOn);public AttributeUsageAttribute(AttributeTargets validOn);new AttributeUsageAttribute : AttributeTargets -> AttributeUsageAttributePublic Sub New (validOn As AttributeTargets)Parameters
- validOn
- AttributeTargets
The set of values combined using a bitwise OR operation to indicate which program elements are valid.
Examples
The definition of the DispId attribute illustrates the use of a bitwise OR operation to combine several AttributeTargets values.
namespace System.Runtime.InteropServices
{
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Field |
AttributeTargets.Property)]
public class DispIdAttribute: System.Attribute
{
public DispIdAttribute(int value) {
// . . .
}
public int Value {
get {
// . . .
return 0;
}
}
}
}
namespace System.Runtime.InteropServices
open System
[<AttributeUsage(AttributeTargets.Method ||| AttributeTargets.Field ||| AttributeTargets.Property)>]
type DispIdAttribute(value: int) =
inherit Attribute()
// . . .
member _.Value with get() =
// . . .
0
Namespace System.Runtime.InteropServices
<AttributeUsage(AttributeTargets.Method _
Or AttributeTargets.Field _
Or AttributeTargets.Property)> _
Public Class DispIdAttribute
Inherits System.Attribute
Public Sub New(value As Integer)
' . . .
End Sub
Public ReadOnly Property Value() As Integer
Get
' . . .
Return 0
End Get
End Property
End Class
End Namespace
Remarks
You can combine several AttributeTargets values using a bitwise OR operation to get the desired combination of valid program elements.
For default property values, see the ValidOn, AllowMultiple, and Inherited properties.
