ExtensionDeclarationAttribute Class

Represents the extension declaration attribute.

Inheritance Hierarchy

System.Object
  System.Attribute
    Microsoft.Data.Schema.Extensibility.ExtensionDeclarationAttribute

Namespace:  Microsoft.Data.Schema.Extensibility
Assembly:  Microsoft.Data.Schema (in Microsoft.Data.Schema.dll)

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Assembly, Inherited := False, AllowMultiple := True)> _
Public NotInheritable Class ExtensionDeclarationAttribute _
    Inherits Attribute

[AttributeUsageAttribute(AttributeTargets.Assembly, Inherited = false, AllowMultiple = true)]
public sealed class ExtensionDeclarationAttribute : Attribute

[AttributeUsageAttribute(AttributeTargets::Assembly, Inherited = false, AllowMultiple = true)]
public ref class ExtensionDeclarationAttribute sealed : public Attribute

[<Sealed>]
[<AttributeUsageAttribute(AttributeTargets.Assembly, Inherited = false, AllowMultiple = true)>]
type ExtensionDeclarationAttribute =  
    class
        inherit Attribute
    end

public final class ExtensionDeclarationAttribute extends Attribute

The ExtensionDeclarationAttribute type exposes the following members.

Constructors

	Name	Description
	ExtensionDeclarationAttribute	Initializes a new instance of the ExtensionDeclarationAttribute class.

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Properties

	Name	Description
	ExtensionType	Gets the extension type.
	TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

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Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	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	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.)

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Explicit Interface Implementations

	Name	Description
	_Attribute.GetIDsOfNames	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
	_Attribute.GetTypeInfo	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
	_Attribute.GetTypeInfoCount	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
	_Attribute.Invoke	Provides access to properties and methods exposed by an object. (Inherited from Attribute.)

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Remarks

This attribute allows users to declare extensions through code. If the default property is set to rue, this extension will be the default extension for the extension interface. If other extensions are defined for the same extension interface, this default extension will not be loaded. If all multiple extensions loaded for the same extension interface are declared as default extensions, Visual Studio will pick the one that is most database schema provider (DSP)-specific. If all the extensions are defined as default and are compatible with the same DSP, no extensions will be loaded.

Thread Safety

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

See Also

Reference

Microsoft.Data.Schema.Extensibility Namespace