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IUnknownConstantAttribute Class

Indicates that the default value for the attributed field or parameter is an instance of UnknownWrapper, where the WrappedObject is Nothing. This class cannot be inherited.

Namespace:  System.Runtime.CompilerServices
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
<AttributeUsageAttribute(AttributeTargets.Field Or AttributeTargets.Parameter, Inherited := False)> _
Public NotInheritable Class IUnknownConstantAttribute _
	Inherits CustomConstantAttribute
'Usage
Dim instance As IUnknownConstantAttribute

You can apply this attribute to fields or parameters.

The type library importer uses this attribute to distinguish a default value of type VT_UNKNOWN from Nothing.

For more information about constant attributes, see the CustomConstantAttribute class.

The classes in System.Runtime.CompilerServices are for compiler writers use only.

System.Object
  System.Attribute
    System.Runtime.CompilerServices.CustomConstantAttribute
      System.Runtime.CompilerServices.IUnknownConstantAttribute

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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