Back to Questions
1.3k
views1
comment
Order of application
f#

Hello,

I'm trying to use F# to play around with System.Drawing, but I can't get this to work:

form.Paint.Add (fun e -> e.Graphics.DrawLine pen 0 0 x y)

which should be equivalent to the C# code:

form.Paint += delegate (PaintEventArgs e) { e.Graphics.DrawLine (...); }

However, I keep on getting this error:

The method or constructor DrawLine does not take 1 arguments. An overload was found taking 5 arguments.

By the way, pen is 'val pen : Pen'.

How might I go around fixing this?

Thank you,

Duncan.

.

Use a tuple of arguments:

1
2
3
4

 

form.Paint.Add (fun e -> e.Graphics.DrawLine(pen,0,0,x,y))

This is the way .NET OO methods are presented. Typically only libaries authored in F# use "curried" argument application (i.e. where the arguments are separated by spaces, and where the first argument returns a residual function awaiting the second arguments etc.)

Don

By on 9/28/2006 4:32 PM ()

    Topic tags

    IntelliFactory Offices 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