Question

I have recently started learning F#, and this is the first time I’ve ever used WinForms. Here is my code.

#light open System open System.Windows.Forms let form =     let temp = new Form()     let ms = new MenuStrip()     let file = new ToolStripDropDownButton('File')     ignore(ms.Items.Add(file))     ignore(file.DropDownItems.Add('TestItem')) \\Code of importance     let things _ _ = ignore(MessageBox.Show('Hai'))     let handle = new EventHandler(things)     ignore(file.Click.AddHandler(handle))     let stuff _ _ = ignore(MessageBox.Show('Hai thar.'))     let handler = new EventHandler(stuff)     let myButton = new Button(Text = 'My button :>', Left = 8, Top = 100, Width = 80)     myButton.Click.AddHandler(handler)     let dc c = (c :> Control)     temp.Controls.AddRange([| dc myButton; dc ms |]);     temp do Application.Run(form) 

What the problem is, I can’t seem to figure out how I would get a handle on the DropDownItems item so that I could use it. I’m sure it’s something simple, but I haven’t been using F# for that long. Thanks for any help.

edit: I’d also like to point out that I know there are alot of ugly syntax in that block of code, but the whole thing is just a test form I’ve been using.

Answer 1

I think you just need to

let ddi = file.DropDownItems.Add('TestItem') //Code of importance 

The problem is that you are ignoring the result of the Add() call, which returns the added item.

Note also that it’s more idiomatic to say

yadda |> ignore 

rather than

ignore(yadda)