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Hi there,

I am building a WPF application and doing the logic in F#

My problem is:

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let init2 (lb_tabbles:ListBox) =
        let l = [ "a"; "b" ]
        lb_tabbles.ItemsSource = l

The compiler says

This expression has type search list but is here used with type System.Collections.IEnumerable.

I tried to solve this by writing a conversion function:

let list_of_fslist (l: 'a list) = 
        let l2 = new System.Collections.Generic.List<'a> ()
        List.iter (fun x -> l2.Add(x)) l
        l2

but this does not work either, because it seems List<'a> cannot be automatically cast to IEnumerable<'a>.

How can I solve the problem?

thank you

Hi,
in your original code sample, you're accidentally using comparison (=) instead of assignment (<-), so I'd first try fixing this:

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 lb_tabbles.ItemsSource <- l

This sometimes happens to everyone who is using C# as well (including myself :-)).

By Tomas Petricek on 11/27/2008 3:41 AM (permalink)

Of course!

I've been using C# for too long...

Thank you :)

By seguso on 11/27/2008 4:16 AM (permalink)

Try an explicit upcast, e.g.

let ie = l :> System.Collections.IEnumerable

and then use 'ie' instead of 'l'.

By brianmcn on 11/27/2008 3:03 AM (permalink)

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