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ConstructorArgumentAttribute Class

Specifies that an object can be initialized by using a non-default constructor syntax, and that a property of the specified name supplies construction information. This information is primarily for XAML serialization.


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

[AttributeUsageAttribute(AttributeTargets.Property, AllowMultiple = false, 
	Inherited = false)]
public sealed class ConstructorArgumentAttribute : Attribute

The ConstructorArgumentAttribute type exposes the following members.

Public methodConstructorArgumentAttributeInitializes a new instance of the ConstructorArgumentAttribute class.

Public propertyArgumentNameGets the name parameter of the constructor that will initialize the associated property.
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.)

This attribute specifies that the associated property can be initialized by a constructor parameter and should be ignored for XAML serialization if the constructor is used to construct the instance. This provides better round trip representations for parameterized constructor syntax rather than default constructor instantiation plus specific attributes.

A framework can potentially support preserving markup extension usages and reconstituting them rather than relying on ProvideValue output in the object tree for serialization. In this case, the ConstructorArgumentAttribute information is useful during serialization for producing an accurate representation of the typical markup extension usage. For more information about markup extensions, see Markup Extensions for XAML Overview.

In order to be valid for a ConstructorArgumentAttribute attribution, a type's public non-default constructor must support exactly one parameter. The name of the parameter must correspond to a read/write property. The property must be otherwise serializable. You use this attribute to create the correspondence between the name of the parameter in the constructor, and the property. Specifically, you apply this attribute to the property-level definition of the connecting read/write property.

Consumers of ConstructorArgumentAttribute may throw in cases where ArgumentName does not resolve to type backing, or when applied to a type that does not have the appropriate construction arguments and arity.

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

WPF Usage Notes

For more information about markup extensions and WPF, see Markup Extensions and WPF 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.