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)>]
type IUnknownConstantAttribute = class
inherit CustomConstantAttributePublic 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
| Name | Description |
|---|---|
| IUnknownConstantAttribute() |
Initializes a new instance of the IUnknownConstantAttribute class. |
Properties
| Name | Description |
|---|---|
| TypeId |
When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute) |
| Value |
Gets the |
Methods
| Name | Description |
|---|---|
| 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) |
