Core.DefaultValueAttribute Class (F#)
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Core.DefaultValueAttribute Class (F#)

Adding this attribute to a field declaration means that the field is not initialized. During type checking a constraint is asserted that the field type supports null. If the Check value is false then the constraint is not asserted.

Namespace/Module Path: Microsoft.FSharp.Core

Assembly: FSharp.Core (in FSharp.Core.dll)

[<AttributeUsage(256, AllowMultiple = false)>]
[<Sealed>]
type DefaultValueAttribute =
 class
  new DefaultValueAttribute : bool -> DefaultValueAttribute
  new DefaultValueAttribute : unit -> DefaultValueAttribute
  member this.Check :  bool
 end

You can also use the short form of the name, DefaultValue.

Member

Description

new

Creates an instance of the attribute

Member

Description

Check

Indicates if a constraint is asserted that the field type supports 'null'

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

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