Windows Dev Center

Windows.Foundation.Metadata namespace

Defines the attributes that indicate fundamental properties of Windows Runtime types and members.


The Windows.Foundation.Metadata namespace has these types of members:


The Windows.Foundation.Metadata namespace has these attributes.

ActivatableAttribute Indicates that the class is an activatable runtime class.
AllowForWebAttribute TBD
AllowMultipleAttribute Indicates that multiple instances of a custom attribute can be applied to a target.
AttributeUsageAttribute Specifies the use of another attribute.
ComposableAttribute Indicates how a programming element is composed.
DefaultAttribute Indicates the default interface for a runtime class.
DefaultOverloadAttribute Indicates that a method is the default overload method.
DeprecatedAttribute Indicates that a type or member should be marked in metadata as deprecated. Compilers and other developer tools can read this attribute and provide info to the user about the deprecation type and possible alternates.
DualApiPartitionAttribute Indicates that the type is supported in desktop apps and in Windows Store apps.
ExclusiveToAttribute Indicates that the specified type is exclusive to this type.
ExperimentalAttribute TBD
GCPressureAttribute Microsoft internal use only.
GuidAttribute Indicates the GUID for the interface or delegate.
HasVariantAttribute Indicates that the type is an instance of a variant IInspectable. Applies to runtime classes, interfaces, and parameterized interfaces.
InternalAttribute TBD
LengthIsAttribute Indicates the number of array elements.
MarshalingBehaviorAttribute Indicates the marshaling behavior of a Windows Runtime component.
MetadataMarshalAttribute TBD
MuseAttribute Indicates that a runtime class is compatible with Windows Store app that are web browsers.
OverloadAttribute Identifies the method as an overload in a language that supports overloading.
OverridableAttribute Indicates that the interface contains overridable methods.
PlatformAttribute Declares the platform that a type should be supported in, when platform-specific metadata is produced.
ProtectedAttribute Indicates that the interface contains protected methods.
RangeAttribute Indicates the numeric range constraints for the value of a data field.
RemoteAsyncAttribute TBD
StaticAttribute Indicates an interface that contains only static methods.
ThreadingAttribute Indicates the threading model of a Windows Runtime component.
VariantAttribute Indicates that the item is an instance of a variant IInspectable. Applies to method parameters, properties, and return values of types.
VersionAttribute Indicates the version of the type.
WebHostHiddenAttribute Identifies the type as one whose functionality is not projected into the specified target language.



The Windows.Foundation.Metadata namespace has these classes.

ApiInformation Enables you to detect whether a specified member, type, or API contract is present so that you can safely make API calls across a variety of devices.



The Windows.Foundation.Metadata namespace has these enumerations.

AttributeTargets Specifies the programming construct to which an attribute applies.
CompositionType Specifies the visibility of a programming element for which the composable attribute is applied.
DeprecationType Indicates a deprecation as Deprecate or Remove.
GCPressureAmount Microsoft internal use only.
MarshalingType Specifies the marshaling type for the class.
Platform Specifies the platforms that a specified type should be supported in, as used by Windows Runtime attributes and metadata.
ThreadingModel Specifies the threading model.



Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Minimum supported phone

Windows Phone 8


Windows::Foundation::Metadata [C++]



See also




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