IUnknownConstantAttribute Class
.NET Framework 3.0
Indicates that the default value for the attributed field or parameter is an instance of UnknownWrapper, where the WrappedObject is a null reference (Nothing in Visual Basic). This class cannot be inherited.
Namespace: System.Runtime.CompilerServices
Assembly: mscorlib (in mscorlib.dll)
Assembly: mscorlib (in mscorlib.dll)
[SerializableAttribute] [AttributeUsageAttribute(AttributeTargets.Field|AttributeTargets.Parameter, Inherited=false)] [ComVisibleAttribute(true)] public sealed class IUnknownConstantAttribute : CustomConstantAttribute
/** @attribute SerializableAttribute() */ /** @attribute AttributeUsageAttribute(AttributeTargets.Field|AttributeTargets.Parameter, Inherited=false) */ /** @attribute ComVisibleAttribute(true) */ public final class IUnknownConstantAttribute extends CustomConstantAttribute
SerializableAttribute AttributeUsageAttribute(AttributeTargets.Field|AttributeTargets.Parameter, Inherited=false) ComVisibleAttribute(true) public final class IUnknownConstantAttribute extends CustomConstantAttribute
Not applicable.
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 a null reference (Nothing in Visual Basic).
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
System.Attribute
System.Runtime.CompilerServices.CustomConstantAttribute
System.Runtime.CompilerServices.IUnknownConstantAttribute
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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