Monday, February 28, 2011

WPF using only F# and Xaml Part 2

This final part of the 2 parts is to try to show how to get all the benefits of Part 1 with out deploying the xaml file along with the binaries.

There are two main things that you need to change.

1) Build Action & Copy to Output Directory
Build Action = Resource
Copy to Output Directory = Do not copy

2) Is of course the code in program.fs.

open System
open System.IO
open System.Windows
open System.Windows.Controls
open System.Windows.Markup

//again do not include the tick marks below in sta-thread attribute.

let uri = new System.Uri("/WPF_with_Xaml;component/MainView.xaml", UriKind.Relative)
let window =  Application.LoadComponent(uri) :?> Window

(* Hook into xaml elements here *)
let why = window.FindName("Why") :?> Button
let answer = window.FindName("answer") :?> TextBlock
(* Handle click event on Why button *)
do why.Click.Add( fun _ -> answer.Text <- "Because F# works with Xaml!!" )

ignore <| (new Application()).Run window

A few things to note when implementing this way.
1) The performance is much slower because the framework has to convert the xaml to baml first.
One way around that would be to obviously have the baml ready to go.
2) If the slightly slow startup is not an issue for you then you get the added benefit of not having to deploy
the xaml file. :-)

Until next time...
Develop with passion

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