DialogResult in F #

Question

Trying to extract DialogResult from a window in an MVVM application, I came across this previous question . After implementing the proposed changes, the sample looks like this:

type DialogCloser() =

    static let DialogResultProperty =
        DependencyProperty.RegisterAttached("DialogResult", typeof<bool>, typeof<DialogCloser>, new PropertyMetadata(DialogResultChanged))

    static member GetDialogResult (a:DependencyObject) =
        a.GetValue(DialogResultProperty) :?> bool

    static member SetDialogResult (a:DependencyObject) (value:string) = 
        a.SetValue(DialogResultProperty, value)

    member this.DialogResultChanged (a:DependencyObject) (e:DependencyPropertyChangedEventArgs) =
        let window = a :?> Window
        match window with
        | null -> failwith "Not a Window"
        | _ -> window.DialogResult <- System.Nullable (e.NewValue :?> bool)

Now DialogResultChangedused until its declaration, which, of course, is not evaluated in F #.

I can not find a working solution, any help would be appreciated.

Answer 1

WPF, # DialogResultsChanged . F #, ( DialogCloser.DialogResultsChanged), - :

type DialogCloser() =

    static let DialogResultProperty =
        DependencyProperty.RegisterAttached
            ( "DialogResult", typeof<bool>, typeof<DialogCloser>, 
              new PropertyMetadata(DialogCloser.DialogResultChanged))

    static member GetDialogResult (a:DependencyObject) =
        a.GetValue(DialogResultProperty) :?> bool

    static member SetDialogResult (a:DependencyObject) (value:string) = 
        a.SetValue(DialogResultProperty, value)

    static member DialogResultChanged 
            (a:DependencyObject) (e:DependencyPropertyChangedEventArgs) =
        let window = a :?> Window
        match window with
        | null -> failwith "Not a Window"
        | _ -> window.DialogResult <- System.Nullable (e.NewValue :?> bool)