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Event.add<'T,'Del> Function (F#)

Den Delimarsky|Last Updated: 8/18/2017
1 Contributor

Runs the given function each time the given event is triggered.

Namespace/Module Path: Microsoft.FSharp.Control.Event

Assembly: FSharp.Core (in FSharp.Core.dll)


// Signature:
Event.add : ('T -> unit) -> IEvent<'Del,'T> -> unit (requires delegate)

// Usage:
Event.add callback sourceEvent


callback Type: 'T ->unit

The function to call when the event is triggered.

sourceEvent Type: IEvent<'Del,'T>

The input event.


This function is named Add in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.


let form = new Form(Text = "F# Windows Form",
                    Visible = true,
                    TopMost = true)
    |> Event.filter ( fun evArgs -> evArgs.X > 100 && evArgs.Y > 100)
    |> Event.add ( fun evArgs ->
        form.BackColor <- System.Drawing.Color.FromArgb(
            evArgs.X, evArgs.Y, evArgs.X ^^^ evArgs.Y) )


Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also

Control.Event Module (F#)

Microsoft.FSharp.Control Namespace (F#)

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