let timerobjvariable=new Timer()For instance:
let timer=new Timer()For a simple example on using a timer control, follow these steps:
1. Click Start>All Programs>Microsoft Visual Studio 2008>Microsoft Visual Studio 2008.
2. Click File>New>Project>Select Visual F# in the project types>Select F# application in the Visual Studio installed templates category.
3. Click the Project menu>Add reference>Click the .Net tab>Locate then double-click System.Windows.Forms.
Do step 3 again and this time, select System.Drawing from the .Net tab.
4. Enter the following code after the line “// Learn more about F# at http://fsharp.net “:
// Learn more about F# at http://fsharp.net //use the F# library open System //use this to enable the intellisense. Very helpful in coding your application open System.Drawing //specify the location of the Form classes open System.Windows.Forms //creates a form let timerform=new Form(Text="Use Timer",StartPosition=FormStartPosition.CenterScreen,AutoScaleMode=AutoScaleMode.Font) //use the random function to generate random numbers let exitbutton=new Button(Text="Exit", Location=new System.Drawing.Point(200, 220)) let random=new Random() //create a timer object and set its interval to 1 second //by default timer are disabled so you'll need to enable it let timer1=new Timer(Interval=1000,Enabled=true) //assigns a random backcolor to our form //change it every 1 second timer1.Tick.Add(fun time->timerform.BackColor<-Color.FromArgb(random.Next(0,255),random.Next(0,255),random.Next(0,255))) //adds the exit button to our form timerform.Controls.Add(exitbutton) //when the exit button is clicked exitbutton.Click.Add(fun quit-> //stops the time timer1.Stop() //close the form timerform.Close()) //show our form timerform.Show() //execute our application Application.Run(timerform)
5. Click the run icon to execute your application. You should now see an output similar to the following screen shot:
If you want a more in depth explanation on this controls, visit the MSDN website at msdn.microsoft.com or the Microsoft F# Development Center at http://msdn.microsoft.com/en-us/fsharp/default.aspx