DefaultInterfaceAttribute Class

.NET Framework 4.5

Specifies the default interface of a managed Windows Runtime class.

System.Object
  System.Attribute
    System.Runtime.InteropServices.WindowsRuntime.DefaultInterfaceAttribute

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

[<Sealed>]
[<AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Interface, AllowMultiple = false, 
    Inherited = false)>]
type DefaultInterfaceAttribute =  
    class 
        inherit Attribute 
    end

The DefaultInterfaceAttribute type exposes the following members.

  NameDescription
Public methodSupported in .NET for Windows Store appsDefaultInterfaceAttributeInitializes a new instance of the DefaultInterfaceAttribute class.
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  NameDescription
Public propertySupported in .NET for Windows Store appsDefaultInterfaceGets the type of the default interface.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodSupported in .NET for Windows Store appsEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodSupported in .NET for Windows Store appsGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodSupported in .NET for Windows Store appsToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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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 Runtime component, 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.

.NET Framework

Supported in: 4.5

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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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