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MarkupExtensionReturnTypeAttribute Class

Reports the type that a markup extension can return.


Namespace:  System.Windows.Markup
Assembly:  System.Xaml (in System.Xaml.dll)

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

The MarkupExtensionReturnTypeAttribute type exposes the following members.

Public methodMarkupExtensionReturnTypeAttribute()Initializes a new instance of the MarkupExtensionReturnTypeAttribute class.
Public methodMarkupExtensionReturnTypeAttribute(Type)Initializes a new instance of the MarkupExtensionReturnTypeAttribute class using the provided Type.
Public methodMarkupExtensionReturnTypeAttribute(Type, Type) Obsolete. Do not use, see Remarks.

Public propertyExpressionType Obsolete. Do not use; see Remarks.
Public propertyReturnTypeGets the MarkupExtension return type that this .NET Framework attribute reports.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets 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.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

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.)

A MarkupExtension derived custom class should apply this .NET Framework attribute to indicate a possible type-safe return type that is returned by its ProvideValue implementation. In other words, if a markup extension always returns a more specific type than type of Object, and casting to that type is a primary scenario, the markup extension class should attribute with MarkupExtensionReturnTypeAttribute and report that type.

In previous versions of the .NET Framework, this class existed in the WPF-specific assembly WindowsBase. In .NET Framework version 4, MarkupExtensionReturnTypeAttribute is in the System.Xaml assembly. For more information, see Types Migrated from WPF to System.Xaml.

For more information on patterns for implementing a custom XAML markup extension, see MarkupExtension and Type Converters and Markup Extensions for XAML.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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.