DefaultInterfaceAttribute Class
 

Specifies the default interface of a managed Windows Runtime class.

Namespace:   System.Runtime.InteropServices.WindowsRuntime
Assembly:  mscorlib (in mscorlib.dll)

SystemObject
   SystemAttribute
    System.Runtime.InteropServices.WindowsRuntimeDefaultInterfaceAttribute

[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Interface, 
	AllowMultiple = false, Inherited = false)]
public sealed class DefaultInterfaceAttribute : Attribute
[AttributeUsageAttribute(AttributeTargets::Class | AttributeTargets::Interface, 
	AllowMultiple = false, Inherited = false)]
public ref class DefaultInterfaceAttribute sealed : Attribute
[<Sealed>]
[<AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Interface,
    AllowMultiple = false, Inherited = false)>]
type DefaultInterfaceAttribute = 
    class
        inherit Attribute
    end
<AttributeUsageAttribute(AttributeTargets.Class Or AttributeTargets.Interface,
	AllowMultiple := False, Inherited := False)>
Public NotInheritable Class DefaultInterfaceAttribute
	Inherits Attribute
NameDescription
System_CAPS_pubmethod DefaultInterfaceAttribute

Initializes a new instance of the DefaultInterfaceAttribute class.

NameDescription
System_CAPS_pubproperty

Gets the type of the default interface.

System_CAPS_pubproperty

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

NameDescription
System_CAPS_pubmethod Equals

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod 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.)

System_CAPS_pubmethod Match

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

When you develop Windows Runtime Components, use this attribute when you want to specify the default interface that is used to marshal the class the attribute is applied to. This is not necessary if you allow the class interfaces to be generated automatically.

A Windows Runtime class must have a default interface. If the WinMdExp.exe utility does not detect a default interface for a class when it builds your Windows Runtimecomponent, it chooses an interface as follows:

  • If the class has automatically generated interfaces, it uses the first one as the default.

  • If the class doesn't have any automatically generated interfaces, it uses the first interface in the class's interface implementation list.

You can apply the DefaultInterfaceAttribute attribute to the class, or apply the Windows.Foundations.Metadata.DefaultAttribute attribute to an interface. The latter takes precedence if both attributes are supplied.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1

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

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