UsableDuringInitializationAttribute Class
 
System_CAPS_noteNote

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Indicates whether this type is built top-down during XAML object graph creation.

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

SystemObject
   SystemAttribute
    System.Windows.MarkupUsableDuringInitializationAttribute

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

Initializes a new instance of the UsableDuringInitializationAttribute class.

NameDescription
System_CAPS_pubproperty

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

System_CAPS_pubproperty

Gets a value that indicates whether the associated class is usable during initialization.

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.)

Top-down is a metaphor that approximates XAML processor behavior when creating the object graph. When built top-down, a class is instantiated, attached to the parent, and then has its properties set. Top-down construction avoids invoking property-changed handlers multiple times. Such handling will ripple up the object graph and therefore eliminating the multiple handler calls provides a performance optimization for startup of the object graph.

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

In WPF XAML for .NET Framework 3.0 and .NET Framework 3.5, top-down construction was built in to the XAML processing for certain classes. The UsableDuringInitializationAttribute attribute formalizes the reporting of the top-down behavior in .NET Framework 4.

.NET Framework
Available since 3.0

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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