A snippet showing a very basic event wiring for printing of Winform containing FSharp.Charting chart

Printing Winform (F#)

// Including F# Chart into WinForm and providing printing functionality
// nuget FSharp.Charting, add references to System.Drawing and System.Windows.Forms
// tested for FSharp.Charting 0.90.5
open System
open FSharp.Charting
open FSharp.Charting.ChartTypes
open System.Drawing
open System.Drawing.Printing
open System.Windows.Forms


[<STAThread; EntryPoint>]
let main args =

    let captureScreen (form: Form) =
        let myGraphics = form.CreateGraphics()
        let size = form.Size
        let memoryImage = new Bitmap(size.Width, size.Height, myGraphics)
        let memoryGraphics = Graphics.FromImage(memoryImage)
        memoryGraphics.CopyFromScreen(form.Location.X, form.Location.Y, 0, 0, size)
        memoryImage

    let myChart = [for x in 0.0 .. 0.1 .. 6.0 -> sin x + cos (2.0 * x)]
                    |> Chart.Line |> Chart.WithYAxis(Title="Test")

    let chart = new ChartControl(myChart, Dock=DockStyle.Fill)
    use printer = new System.Drawing.Printing.PrintDocument()
    let printBtn = new Button(Text="Print", Dock=DockStyle.Bottom) 
    printBtn.Click.Add(fun prt -> printer.Print())
    let form = new Form(Visible = true, TopMost = true, Width = 700, Height = 500)
    printer.PrintPage.Add(fun prt ->
                                printBtn.Visible <- false
                                prt.Graphics.DrawImage(captureScreen(form), 0, 0)
                                printBtn.Visible <- true)
    
    form.Controls.AddRange([|chart; printBtn |])
    do Application.Run(form) |> ignore
    0