Table of contents
Collapse the table of content
Expand the table of content

Patterns.FieldSet Active Pattern (F#)

Den Delimarsky|Last Updated: 8/18/2017
1 Contributor

Recognizes expressions that represent setting a static or instance field.

Namespace/Module Path: Microsoft.FSharp.Quotations.Patterns

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


// Signature:
( |FieldSet|_| ) : Expr -> (Expr option * FieldInfo * Expr) option


input Type: Expr

The input expression to match against.

Return Value

The formal return type is (Expr option * FieldInfo * Expr) option. The option determines whether the input results in a match. In a pattern matching expression, the input is decomposed into a tuple of three elements. The first is an option that can contain an expression that represents the instance. This element is None if the field is static. The second element is a T:System.Reflection.FieldInfo object, and the third element is an expression that represents the value to set the field to.


This function is named FieldSetPattern in the .NET Framework assembly. If you are accessing the member from a .NET Framework language other than F#, or through reflection, use this name.


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

Quotations.Patterns Module (F#)

Microsoft.FSharp.Quotations Namespace (F#)

© 2019 Microsoft