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Core.OptionalArgumentAttribute Class (F#)

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This attribute is added automatically for all optional arguments.

Namespace/Module Path: Microsoft.FSharp.Core

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

[<AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false)>]
[<Sealed>]
type OptionalArgumentAttribute =
 class
  new OptionalArgumentAttribute : unit -> OptionalArgumentAttribute
 end

Remarks

You can apply this attribute to a parameter that is an option type to make it an optional parameter. This is the equivalent of applying a ? to the parameter name in the parameter list. Optional parameters should not be followed by non-optional parameters in the parameter list.

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

Constructors

Member

Description

new

Creates an instance of the attribute

Platforms

Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also

Reference

Microsoft.FSharp.Core Namespace (F#)