ImportAttribute.AllowDefault Property
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Gets or sets a value that indicates whether the property, field, or parameter will be set to its type's default value when an export with the contract name is not present in the container.
Namespace: System.ComponentModel.Composition
Assembly: System.ComponentModel.Composition (in System.ComponentModel.Composition.dll)
Syntax
'Declaration
Public Property AllowDefault As Boolean
public bool AllowDefault { get; set; }
Property Value
Type: System.Boolean
true if the property, field, or parameter will be set to its type's default value when there is no export with the ContractName in the CompositionContainer; otherwise, false. The default is false.
Remarks
The default value of the type of a property, field, or parameter is nulla null reference (Nothing in Visual Basic) for reference types and zero for numeric value types. For other value types, the default value will be each field of the value type initialized to zero if the field is a value type, or nulla null reference (Nothing in Visual Basic) if the field is a reference type.
Version Information
Silverlight
Supported in: 5, 4
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.