Working With ComboBox in FSharp

ComboBox is used to make a single selection from a list of items by user. In this article you will learn how to use a ComboBox in FSharp.

Introduction: ComboBox is used to make a single selection from a list of items by user. Now we will create a ComboBox in FSharp application. The syntax for creating ComboBox is given below

Syntax For Creating ComboBox:
    let ComboBox_Name=new ComboBox()

Like, let combo=new ComboBox()

Now we create a window form. For doing this we create a F# Application as show below



We go to Solution Explorer and right Click on References. Then Click on .NET and select System.Drawing and System.Windows.Form and Click on ok button. Figure is given below



Then, We write the following code.

open System
open System.Windows.Forms
open System.Drawing 
 
let form=new Form()
form.Text<- "My Window Application"
form.BackColor <-Color.Gray
 
let combo=new ComboBox()
 
form.Controls.Add(combo)
Application.Run(form)

Now we run the application. The output will look like the below figure



This ComboBox has no items. Now we bind the ComboBox with a set of values. We write the following code

open System
open System.Windows.Forms
open System.Drawing 
 
let form=new Form()
form.Text<- "My Window Application"
form.BackColor <-Color.Gray

let items=[|"A";"B";"C";"D";"E";"F"|]
 
let combo=new ComboBox(DataSource=items)
form.Controls.Add(combo)
Application.Run(form)

We run the application. The output will look like the below figure



When we Click on the ComboBox, it shows all items, allowing the user to select one of them, like the below figure