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Default parameter value. Useful for ASP.NET controllers

Usage: [] member __.Image (image, DefaultValue 1024 width, DefaultValue 768 height) 

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let (|DefaultValue|) (defaultValue: 't) (input: 't) =
    if obj.Equals(input, Unchecked.defaultof<'t>) then 
      defaultValue 
    else 
      input
Multiple items
type DefaultValueAttribute =
  inherit Attribute
  new : unit -> DefaultValueAttribute
  new : check:bool -> DefaultValueAttribute
  member Check : bool

Full name: Microsoft.FSharp.Core.DefaultValueAttribute

--------------------
new : unit -> DefaultValueAttribute
new : check:bool -> DefaultValueAttribute
val defaultValue : 't
val input : 't
type obj = System.Object

Full name: Microsoft.FSharp.Core.obj
System.Object.Equals(objA: obj, objB: obj) : bool
module Unchecked

from Microsoft.FSharp.Core.Operators
val defaultof<'T> : 'T

Full name: Microsoft.FSharp.Core.Operators.Unchecked.defaultof
Raw view Test code New version

More information

Link:http://fssnip.net/7Vg
Posted:6 years ago
Author:Yuri Martynov
Tags: #active patterns , asp.net , pattern matching

This web site is created using F# and Suave web server. It is hosted on Azure and the source code is on GitHub. Contributions are welcome!

The first version of fssnip.net has been created by @tomaspetricek back in 2010. This web site is a new, open-source and contribution-friendly version.