Hi,
"()" is used to represent unit. It's very general and can be used in a number of situations, for example;
1 2 3 4 5 6 7 8
> let x = fun () -> ();; val x : unit -> unit > x;; val it : (unit -> unit) = <fun:clo@0> > x();; val it : unit = ()
Cheers,
Andy
thank you for the quick (and correct!) reply :)
You probably want to use the ignore function to make something evealuate to the unit type.
let buttonClicked (e:System.EventArgs) =
MessageBox.Show(e.ToString()) |> ignore
I'm probably going to start sounding like a broken record, but this is covered at the beginning of chapter 4 in my book:
[link:www.amazon.com]
Topic tags
- f# × 3707
- websharper × 2884
- core × 418
- bolero × 329
- compiler × 291
- enhancement × 215
- functional × 201
- bug × 176
- ui next × 140
- ui × 132
- c# × 122
- classes × 97
- web × 97
- .net × 84
- book × 84
- async × 77
- ui.next × 67
- templates × 58
- website × 51
- trywebsharper × 50
- question × 46
- html × 45
- server × 45
- owin × 44
- javascript × 43
- parallel × 43
- parsing × 41
- testing × 41
- typescript × 39
- template × 38
- sitelet × 31
- asynchronous × 30
- feature request × 28
- monad × 28
- ocaml × 28
- warp × 28
- tutorial × 27
- haskell × 26
- dotnet-ws × 23
- linq × 22
- sitelets × 22
- workflows × 22
- rpc × 21
- getting started × 20
- wpf × 20
- fpish × 19
- introduction × 19
- silverlight × 19
- monodevelop × 17
- piglets × 17
- suave × 17
- docs × 16
- collections × 15
- jquery × 15
- proposal × 15
- aspnetcore × 14
- pipeline × 14
- reactive × 14
- 4.6.0.361 × 13
- documentation × 13
- kendoui × 13
- formlets × 12
- 4.1.0.171 × 11
- monads × 11
- released: v0.1 × 11
- websocket × 11
- 4.4.0.280 × 10
- 4.4.1.288 × 10
- opinion × 10
- tryfsharponwasm × 10
- 4.0.190.100-rc × 9
- deployment × 9
- fixed × 9
- in × 9
- json × 9
- plugin × 9
- scheme × 9
- solid × 9
- 4.3.0.274 × 8
- 4.5.4.317 × 8
- basics × 8
- concurrent × 8
- highcharts × 8
- how-to × 8
- mvu × 8
- python × 8
- released: v0.11 × 8
- wontfix × 8
- 4.1.1.175 × 7
- 4.5.1.304 × 7
- complexity × 7
- remoting × 7
- visual studio × 7
- 4.1.2.178 × 6
- 4.5.4.151 × 6
- authentication × 6
- datefns × 6
- lisp × 6
- real-world × 6
- released in 4.0.192.103-rc × 6
- resources × 6
- scala × 6
- websharper ui.next × 6
- workshop × 6
- xaml × 6
- 4.0.193.110 × 5
- 4.2.11.258 × 5
- 4.2.3.236 × 5
- aspnetmvc × 5
- azure × 5
- bootstrap × 5
- conference × 5
- css × 5
- dsl × 5
- formlet × 5
- java × 5
- list × 5
- metaprogramming × 5
- ml × 5
- q&a × 5
- released in Zafir.4.0.188.91-beta10 × 5
- released: v0.4 × 5
- released: v0.8 × 5
- spa × 5
- sql × 5
- visualstudio × 5
- websharper.forms × 5
- zafir × 5
- 4.0.192.106 × 4
- 4.0.195.127 × 4
- 4.1.0.38 × 4
- 4.2.1.86 × 4
- 4.2.13.263 × 4
- 4.2.6.118 × 4
- 4.5.5.155 × 4
- 4.6.4.404 × 4
- discussion × 4
- example × 4
- extension × 4
- extensions × 4
- fsi × 4
- fsx × 4
- help wanted × 4
- highlightjs × 4
- html5 × 4
- jqueryui × 4
- lift × 4
- performance × 4
- qna × 4
- react × 4
- reflection × 4
- released: v0.10 × 4
- released: v0.5 × 4
- remote × 4
- rest × 4
- teaching × 4
- todomvc × 4
- 4.0.196.147 × 3
- 4.1.0.34 × 3
- 4.1.6.207 × 3
- 4.2.1.223-beta × 3
- 4.2.14.264 × 3
- 4.2.4.114 × 3
- 4.2.4.247 × 3
- 4.2.5.115 × 3
- 4.2.6.253 × 3
- 4.2.9.256 × 3
- 4.5.0.140 × 3
- 4.5.0.290 × 3
- 4.5.18.348 × 3
- 4.5.2.309 × 3
- 4.5.8.327 × 3
- 4.6.2.386 × 3
- ajax × 3
- alt.net × 3
- aml × 3
- asp.net mvc × 3
- build × 3
- canvas × 3
- cloudsharper × 3
- compilation × 3
- d3 × 3
- data × 3
- database × 3
- erlang × 3
- events × 3
- file upload × 3
- forums × 3
- how to × 3
- http × 3
- inline × 3
- issue × 3
- kendo × 3
- macro × 3
- materialui × 3
- mono × 3
- msbuild × 3
- mvc × 3
- pattern × 3
- piglet × 3
- released in Zafir.4.0.187.90-beta10 × 3
- released: v0.12 × 3
- released: v0.9 × 3
- svg × 3
- type provider × 3
- view × 3
- websharper4 × 3
- 4.1.1.64 × 2
- 4.1.5.203 × 2
- 4.1.7.232 × 2
- 4.2.10.257 × 2
- 4.2.3.111 × 2
- 4.2.5.249 × 2
- 4.3.0.127 × 2
- 4.3.1.275 × 2
- 4.5.10.166 × 2
- 4.5.10.332 × 2
- 4.5.15.342 × 2
- 4.5.19.349 × 2
- 4.5.3.146 × 2
- 4.5.9.301 × 2
- android × 2
- api × 2
- asp.net × 2
- beginner × 2
- blog × 2
- chart × 2
- client × 2
- client server app × 2
- clojure × 2
- computation expressions × 2
- constructor × 2
- corporate × 2
- courses × 2
- cufp × 2
- debugging × 2
- direct × 2
- discriminated union × 2
- dom × 2
- elm × 2
- endpoint × 2
- endpoints × 2
- enterprise × 2
- entity framework × 2
- event × 2
- f# interactive × 2
- fable × 2
- flowlet × 2
- formdata × 2
- forms × 2
- fsc × 2
- fsharp × 2
- google × 2
- google maps × 2
- hosting × 2
- https × 2
- iis 8.0 × 2
- install × 2
- interactive × 2
- interface × 2
- iphone × 2
- iteratee × 2
- jobs × 2
- jquery mobile × 2
- keynote × 2
- lens × 2
- lenses × 2
- linux × 2
- listmodel × 2
- mac × 2
- maps × 2
- numeric × 2
- oauth × 2
- obfuscation × 2
- offline × 2
- oop × 2
- osx × 2
- packaging × 2
- pattern matching × 2
- pipelines × 2
- post × 2
- quotation × 2
- reference × 2
- released in Zafir.4.0.185.88-beta10 × 2
- released: v0.13 × 2
- released: v0.6 × 2
- remarkable × 2
- rx × 2
- script × 2
- security × 2
- self host × 2
- seq × 2
- sockets × 2
- stm × 2
- sweetalert × 2
- tcp × 2
- trie × 2
- tutorials × 2
- type × 2
- url × 2
- var × 2
- websharper.charting × 2
- websockets × 2
- wig × 2
- xna × 2
- zh × 2
- .net framework × 1
- .net interop × 1
- 2012 × 1
- 4.0.194.126 × 1
- 4.1.3.184 × 1
- 4.1.4.189 × 1
- 4.2.0.214-beta × 1
- 4.2.12.259 × 1
- 4.2.2.231-beta × 1
- 4.2.8.255 × 1
- 4.4.1.137 × 1
- 4.5.1.141 × 1
- 4.5.11.334 × 1
- 4.5.12.177 × 1
- 4.5.13.318 × 1
- 4.5.13.338 × 1
- 4.5.16.344 × 1
- 4.5.2.145 × 1
- 4.5.3.144 × 1
- 4.5.3.310 × 1
- 4.5.5.319 × 1
- 4.5.6.156 × 1
- 4.5.6.320 × 1
- 4.5.7.322 × 1
- 4.5.8.161 × 1
- 4.5.9.164 × 1
- 4.6.1.127 × 1
- 4.6.1.381 × 1
- 4.6.3.388 × 1
- 4.6.5.406 × 1
- 4.6.6.407 × 1
- Canvas Sample Example × 1
- DynamicStyle Animated Style × 1
- ES8 × 1
- Fixed in 4.0.190.100-rc × 1
- Metro-Ui-Css × 1
- Metro4 × 1
- Released in Zafir.UI.Next.4.0.169.79-beta10 × 1
- SvgDynamicAttribute × 1
- Swiper × 1
- WebComponent × 1
- WebSharper.TypeScript × 1
- abstract class × 1
- accumulator × 1
- active pattern × 1
- actor × 1
- addin × 1
- agents × 1
- aggregation × 1
- agile × 1
- alter session × 1
- animation × 1
- anonymous object × 1
- apache × 1
- appcelerator × 1
- architecture × 1
- array × 1
- arrays × 1
- asp.net 4.5 × 1
- asp.net core × 1
- asp.net integration × 1
- asp.net mvc 4 × 1
- asp.net web api × 1
- aspnet × 1
- ast × 1
- attributes × 1
- authorization × 1
- b-tree × 1
- back button × 1
- badimageformatexception × 1
- bash script × 1
- batching × 1
- binding-vars × 1
- bistro × 1
- body × 1
- bundle × 1
- camtasia studio × 1
- cas protocol × 1
- charts × 1
- clarity × 1
- class × 1
- cli × 1
- clipboard × 1
- clojurescript × 1
- closures × 1
- cloud × 1
- cms × 1
- code-review × 1
- coding diacritics × 1
- color highlighting × 1
- color zones × 1
- combinator × 1
- combinators × 1
- compile × 1
- compile code on server × 1
- config × 1
- confirm × 1
- content × 1
- context × 1
- context.usersession × 1
- continuation-passing style × 1
- coords × 1
- cordova × 1
- cors × 1
- coursera × 1
- cross-domain × 1
- csla × 1
- current_schema × 1
- custom content × 1
- data grid × 1
- datetime × 1
- debug × 1
- declarative × 1
- delete × 1
- devexpress × 1
- dhtmlx × 1
- dictionary × 1
- directattribute × 1
- disqus × 1
- distance × 1
- do binding × 1
- doc elt ui.next upgrade × 1
- docker × 1
- dojo × 1
- dol × 1
- domain × 1
- dotnet core × 1
- du × 1
- duf-101 × 1
- dynamic × 1
- eastern language × 1
- eclipse × 1
- edsl × 1
- em algorithm × 1
- emacs × 1
- emotion × 1
- enums × 1
- error × 1
- etw × 1
- euclidean × 1
- eventhandlerlist × 1
- examples × 1
- ext js × 1
- extension methods × 1
- extjs × 1
- extra × 1
- facet pattern × 1
- failed to translate × 1
- fake × 1
- fantomas × 1
- fear × 1
- float × 1
- form × 1
- form-data × 1
- forum × 1
- fp × 1
- frank × 1
- fsdoc × 1
- fsharp.core × 1
- fsharp.powerpack × 1
- fsharpx × 1
- fsunit × 1
- function × 1
- functional style × 1
- game × 1
- games × 1
- gc × 1
- generic × 1
- geometry × 1
- getlastwin32error × 1
- getting-started × 1
- good first issue × 1
- google visualization timeline × 1
- google.maps × 1
- grid × 1
- group × 1
- guide × 1
- hash × 1
- headers × 1
- hello world example × 1
- heroku × 1
- highchart × 1
- history × 1
- html-templating × 1
- http405 × 1
- httpcontext × 1
- hubfs × 1
- i18n × 1
- ide × 1
- ie 8 × 1
- if-doc × 1
- iis × 1
- image × 1
- images × 1
- inheritance × 1
- initialize × 1
- input × 1
- install "visual studio" × 1
- installer × 1
- int64 × 1
- interfaces × 1
- internet explorer × 1
- interop × 1
- interpreter × 1
- invalid × 1
- io × 1
- iobservable × 1
- ios × 1
- iot × 1
- ipad × 1
- isomorphic × 1
- javascript optimization × 1
- javascript semanticui resources × 1
- jquery-plugin × 1
- jquery-ui × 1
- jquery-ui-datepicker × 1
- jquerymobile × 1
- js × 1
- kendo datasource × 1
- kendochart × 1
- kendoui compiler × 1
- knockout × 1
- l10n × 1
- leaflet × 1
- learning × 1
- library × 1
- libs × 1
- license × 1
- licensing × 1
- lineserieszonescfg × 1
- local setting × 1
- localization × 1
- logging × 1
- loop × 1
- macros × 1
- mailboxprocessor × 1
- mapping × 1
- markerclusterer × 1
- markup × 1
- marshal × 1
- math × 1
- mathjax × 1
- message × 1
- message passing × 1
- message-passing × 1
- meta × 1
- metro style × 1
- metro-ui × 1
- micro orm × 1
- minimum-requirements × 1
- mix × 1
- mobile installation × 1
- mod_mono × 1
- modal × 1
- module × 1
- mouseevent × 1
- mouseposition × 1
- multidimensional × 1
- multiline × 1
- multithreading × 1
- mysql × 1
- mysqlclient × 1
- nancy × 1
- native × 1
- nested × 1
- nested loops × 1
- netstandard × 1
- node × 1
- nunit × 1
- object relation mapper × 1
- object-oriented × 1
- om × 1
- onboarding × 1
- onclick × 1
- optimization × 1
- option × 1
- orm × 1
- os x × 1
- output-path × 1
- override × 1
- paper × 1
- parameter × 1
- persistence × 1
- persistent data structure × 1
- phonegap × 1
- plotly × 1
- pola × 1
- powerpack × 1
- prefix tree × 1
- principle of least authority × 1
- privacy × 1
- private × 1
- profile × 1
- programming × 1
- project × 1
- project euler × 1
- projekt_feladat × 1
- protected × 1
- provider × 1
- proxy × 1
- ptvs × 1
- public × 1
- pure f# × 1
- purescript × 1
- quant × 1
- query sitelet × 1
- quotations × 1
- range × 1
- raphael × 1
- razor × 1
- rc × 1
- reactjs × 1
- real-time × 1
- ref × 1
- region × 1
- released in 4.0.190.100-rc × 1
- released: v0.2 × 1
- released: v0.3 × 1
- released: v0.7 × 1
- reporting × 1
- responsive design × 1
- rest api × 1
- rest sitelet × 1
- restful × 1
- round table × 1
- router × 1
- routing × 1
- rpc reverseproxy × 1
- runtime × 1
- sales × 1
- sample × 1
- sampleapp × 1
- scriptcs × 1
- scripting × 1
- search × 1
- self hosted × 1
- semanticui × 1
- sequence × 1
- serialisation × 1
- service × 1
- session-state × 1
- sharepoint × 1
- signals × 1
- sitelet website × 1
- sitelet.protect × 1
- sitlets × 1
- slickgrid × 1
- source code × 1
- sqlentityconnection × 1
- ssl × 1
- standards × 1
- static content × 1
- stickynotes × 1
- streamreader × 1
- stress × 1
- strong name × 1
- structures × 1
- submitbutton × 1
- subscribe × 1
- svg example html5 websharper.ui.next × 1
- system.datetime × 1
- system.reflection.targetinvocationexception × 1
- table storage × 1
- targets × 1
- tdd × 1
- template ClientServer × 1
- templates ui.next × 1
- templating × 1
- text parsing × 1
- three.js × 1
- time travel × 1
- tls × 1
- tooltip × 1
- tracing × 1
- tsunamiide × 1
- turkish × 1
- twitter-bootstrap × 1
- type erasure × 1
- type inference × 1
- type providers × 1
- type-providers × 1
- typeprovider × 1
- ui next forms × 1
- ui-next × 1
- ui.next jqueryui × 1
- ui.next charting × 1
- ui.next formlets × 1
- ui.next forms × 1
- ui.next suave visualstudio × 1
- ui.next templating × 1
- unicode × 1
- unittest client × 1
- up for grabs × 1
- upload × 1
- usersession × 1
- validation × 1
- vb × 1
- vb.net × 1
- vector × 1
- view.map × 1
- visal studio × 1
- visual f# × 1
- visual studio 11 × 1
- visual studio 2012 × 1
- visual studio code × 1
- visual studio shell × 1
- visualstudio-websharper × 1
- vs2017 compiler zafir × 1
- vsix × 1
- web api × 1
- web-scraping × 1
- webapi × 1
- webcomponents × 1
- webforms × 1
- webgl × 1
- webrtc × 1
- webshaper × 1
- websharper async × 1
- websharper codemirror × 1
- websharper f# google × 1
- websharper forms × 1
- websharper reactive × 1
- websharper rpc × 1
- websharper sitelets routing × 1
- websharper warp × 1
- websharper-interface-generator × 1
- websharper.chartsjs × 1
- websharper.com × 1
- websharper.exe × 1
- websharper.owin × 1
- websharper.ui.next × 1
- websharper.ui.next jquery × 1
- websockets iis × 1
- webspeech × 1
- why-websharper × 1
- windows 7 × 1
- windows 8 × 1
- windows-phone × 1
- winrt × 1
- www.grabbitmedia.com × 1
- xamarin × 1
- xml × 1
- yeoman × 1
- yield × 1
- zafir beta × 1
- zafir websharper4 × 1
- zarovizsga × 1
|
Copyright (c) 2011-2012 IntelliFactory. All rights reserved. Home | Products | Consulting | Trainings | Blogs | Jobs | Contact Us | Terms of Use | Privacy Policy | Cookie Policy |
Built with WebSharper |
I have a windows forms button and I attach a function to its Click event, how can I make the function evaluate to the unit type?
let button = new Button()
button.Click.Add(buttonClicked)
let buttonClicked (e:System.EventArgs) =
let d = MessageBox.Show(e.ToString())
printf "" // stupid way of forcing the expression to evaluate to the unit type .. (?)
Any suggestions?