IUnknownConstantAttribute Class
Definition
Important
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Indicates that the default value for the attributed field or parameter is an instance of UnknownWrapper, where the WrappedObject is null
. This class cannot be inherited.
public ref class IUnknownConstantAttribute sealed : System::Runtime::CompilerServices::CustomConstantAttribute
[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter, Inherited=false)]
public sealed class IUnknownConstantAttribute : System.Runtime.CompilerServices.CustomConstantAttribute
[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter, Inherited=false)]
[System.Serializable]
public sealed class IUnknownConstantAttribute : System.Runtime.CompilerServices.CustomConstantAttribute
[System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter, Inherited=false)]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class IUnknownConstantAttribute : System.Runtime.CompilerServices.CustomConstantAttribute
[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter, Inherited=false)>]
type IUnknownConstantAttribute = class
inherit CustomConstantAttribute
[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter, Inherited=false)>]
[<System.Serializable>]
type IUnknownConstantAttribute = class
inherit CustomConstantAttribute
[<System.AttributeUsage(System.AttributeTargets.Field | System.AttributeTargets.Parameter, Inherited=false)>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type IUnknownConstantAttribute = class
inherit CustomConstantAttribute
Public NotInheritable Class IUnknownConstantAttribute
Inherits CustomConstantAttribute
- Inheritance
- Attributes
Remarks
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 null
.
For more information about constant attributes, see the CustomConstantAttribute class.
The classes in System.Runtime.CompilerServices are for compiler writers use only.
Constructors
IUnknownConstantAttribute() |
Initializes a new instance of the IUnknownConstantAttribute class. |
Properties
TypeId |
When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute) |
Value |
Gets the |
Methods
Equals(Object) |
Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute) |
GetHashCode() |
Returns the hash code for this instance. (Inherited from Attribute) |
GetType() |
Gets the Type of the current instance. (Inherited from Object) |
IsDefaultAttribute() |
When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute) |
Match(Object) |
When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute) |
MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
ToString() |
Returns a string that represents the current object. (Inherited from Object) |
Explicit Interface Implementations
_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) |
Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute) |
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr) |
Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute) |
_Attribute.GetTypeInfoCount(UInt32) |
Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute) |
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) |
Provides access to properties and methods exposed by an object. (Inherited from Attribute) |