Windows.​Foundation.​Metadata Windows.​Foundation.​Metadata Windows.​Foundation.​Metadata Namespace


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


ActivatableAttribute ActivatableAttribute ActivatableAttribute

Indicates that the class is an activatable runtime class.

AllowForWebAttribute AllowForWebAttribute AllowForWebAttribute

Enables developers to expose a native Universal Windows Platform (UWP) object as a global parameter in the context of the top-level document inside of a WebView. For a Universal Windows Platform (UWP) object to be projected, it must implement IAgileObject and be decorated with the AllowForWebAttribute attribute.

AllowMultipleAttribute AllowMultipleAttribute AllowMultipleAttribute

Indicates that multiple instances of a custom attribute can be applied to a target.

ApiContractAttribute ApiContractAttribute ApiContractAttribute

Specifies that the type represents an API contract.

ApiInformation ApiInformation 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.

AttributeUsageAttribute AttributeUsageAttribute AttributeUsageAttribute

Specifies the use of another attribute.

.NET This type appears as System.AttributeUsageAttribute.

ComposableAttribute ComposableAttribute ComposableAttribute

Indicates how a programming element is composed.

ContractVersionAttribute ContractVersionAttribute ContractVersionAttribute

Indicates the version of the API contract.

CreateFromStringAttribute CreateFromStringAttribute CreateFromStringAttribute

Create from string attribute.

DefaultAttribute DefaultAttribute DefaultAttribute

Indicates the default interface for a runtime class.

DefaultOverloadAttribute DefaultOverloadAttribute DefaultOverloadAttribute

Indicates that a method is the default overload method. This attribute must be used with OverloadAttribute.

DeprecatedAttribute DeprecatedAttribute 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 DualApiPartitionAttribute DualApiPartitionAttribute

Indicates that the type is supported in desktop apps and in Windows Store apps.

ExclusiveToAttribute ExclusiveToAttribute ExclusiveToAttribute

Indicates that the specified type is exclusive to this type.

ExperimentalAttribute ExperimentalAttribute ExperimentalAttribute

Indicates that a type or member should be marked in metadata as experimental, and consequently may not be present in the final, released version of an SDK or library.

FeatureAttribute FeatureAttribute FeatureAttribute

Expresses the state of the Windows Runtime feature associated with a Windows Runtime Type.

GCPressureAttribute GCPressureAttribute GCPressureAttribute

Microsoft internal use only.

GuidAttribute GuidAttribute GuidAttribute

Indicates the GUID for the interface or delegate.

HasVariantAttribute HasVariantAttribute HasVariantAttribute

Indicates that the type is an instance of a variant IInspectable. Applies to runtime classes, interfaces, and parameterized interfaces.

InternalAttribute InternalAttribute InternalAttribute

Indicates that a type or member should be marked in metadata as internal to the SDK or framework, and for consumption by system components only.

LengthIsAttribute LengthIsAttribute LengthIsAttribute

Indicates the number of array elements.

MarshalingBehaviorAttribute MarshalingBehaviorAttribute MarshalingBehaviorAttribute

Indicates the marshaling behavior of a Windows Runtime component.

MetadataMarshalAttribute MetadataMarshalAttribute MetadataMarshalAttribute

Indicates that tools should create an entry for an interface when creating an application package.

MuseAttribute MuseAttribute MuseAttribute

Indicates that a runtime class is compatible with Windows Store app that are web browsers.

OverloadAttribute OverloadAttribute OverloadAttribute

Identifies the method as an overload in a language that supports overloading.

OverridableAttribute OverridableAttribute OverridableAttribute

Indicates that the interface contains overridable methods.

PlatformAttribute PlatformAttribute PlatformAttribute

Declares the platform that a type should be supported in, when platform-specific metadata is produced.

PreviousContractVersionAttribute PreviousContractVersionAttribute PreviousContractVersionAttribute

Indicates that the type was previously associated with a different API contract.

ProtectedAttribute ProtectedAttribute ProtectedAttribute

Indicates that the interface contains protected methods.

RangeAttribute RangeAttribute RangeAttribute

Indicates the numeric range constraints for the value of a data field.

RemoteAsyncAttribute RemoteAsyncAttribute RemoteAsyncAttribute

Indicates that an interface can be delivered using an asynchronous form of the Async pattern.

StaticAttribute StaticAttribute StaticAttribute

Indicates an interface that contains only static methods.

ThreadingAttribute ThreadingAttribute ThreadingAttribute

Indicates the threading model of a Windows Runtime component.

VariantAttribute VariantAttribute VariantAttribute

Indicates that the item is an instance of a variant IInspectable. Applies to method parameters, properties, and return values of types.

VersionAttribute VersionAttribute VersionAttribute

Indicates the version of the type.

WebHostHiddenAttribute WebHostHiddenAttribute WebHostHiddenAttribute

Identifies the type as one whose functionality is not projected into the specified target language.


AttributeTargets AttributeTargets AttributeTargets

Specifies the programming construct to which an attribute applies.

.NET This type appears as System.AttributeTargets.

CompositionType CompositionType CompositionType

Specifies the visibility of a programming element for which the composable attribute is applied.

DeprecationType DeprecationType DeprecationType

Indicates a deprecation as Deprecate or Remove.

FeatureStage FeatureStage FeatureStage

Values that indicate if a Windows feature is enabled or disabled.

GCPressureAmount GCPressureAmount GCPressureAmount

Microsoft internal use only.

MarshalingType MarshalingType MarshalingType

Specifies the marshaling type for the class.

Platform Platform Platform

Specifies the platforms that a specified type should be supported in, as used by Windows Runtime attributes and metadata.

ThreadingModel ThreadingModel ThreadingModel

Specifies the threading model.