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passed to them. Their behavior is altered when no element in the collection meets the condition. find throws an exception, whereas tryfind returns an option type that will be None if no element is found. Since exceptions are relatively expensive in .NET, you should prefer tryfind over find. In the following example, you ll look through a list of words. First, you use filter to create a list containing only the words that end in at. Then you ll use find to find the first word that ends in ot. Finally, you ll use tryfind to check whether any of the words end in tt. let shortWordList = [|"hat"; "hot"; "bat"; "lot"; "mat"; "dot"; "rat";|] let atWords = shortWordList |> Seq.filter (fun x -> x.EndsWith("at")) let otWord = shortWordList |> Seq.find (fun x -> x.EndsWith("ot")) let ttWord = shortWordList |> Seq.tryFind (fun x -> x.EndsWith("tt")) atWords printfn printfn printfn |> Seq.iter (fun x -> printf "%s ... " x) "" "%s" otWord "%s" (match ttWord with | Some x -> x | None -> "Not found")

Summary

Most of the forms and user controls in this example provide non-default constructors that is, custom constructors that accept one or more arguments. This makes it easy for your code to correctly create and configure the form or user control in one step, supplying the necessary document. However, the zero-argument constructor is still required because it s used by Visual Studio to create the user control or form at design time. You also need to call this constructor to make sure the controls you added at design time are instantiated at runtime. You achieve this by adding the colon after the constructor declaration, followed by the keyword this and any parameters to indicate the constructor you want to use. (Alternatively, you could call the InitializeComponent() method directly from your constructor.)

Note If you want to add the OrderGridView at design time, make sure you subsequently set the Document

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The results of this code, when compiled and executed, are as follows: hat ... bat ... mat ... rat ... hot Not found

Our simple example doesn t provide an additional product catalog instead, a random order item is added every time the Add button is clicked. It also doesn t include any code for editing items. None of these details would change the overall model being used. You also should notice that the RefreshList() method handles the DocumentChanged event, ensuring that the list is rebuilt if any change is made by any view (or even through code).

This chapter explained how to install and reinstall Windows Home Server. It also examined some of the more common setup problems and offered possible solutions. The next chapter takes you through the steps that you need to perform to configure your Windows Home Server installation.

The OrderPrintPreview class is also a user control, but it contains only a single instance of the PrintPreview control. Once again, this example is intentionally crude. You can easily add other controls for zooming, moving from page to page, and otherwise configuring the print preview. Similarly, the printed output is very basic and doesn t include details like an attractive title or letterhead. Figure 19-11 shows the OrderPrintPreview view in action.

The OrderPrintPreview class follows a similar design to the OrderGridView. A reference to the document is set in the constructor, and the RefreshList() method handles the DocumentChanged event. The only difference is that the RefreshList() needs to initiate printing using a PrintDocument instance. The PrintDocument.PrintPage event handler writes the output to the preview window. public partial class OrderPrintPreview : System.Windows.Forms.UserControl { private Order document; public Order Document { set { // Store a reference to the document, attach the event handler, // and refresh the display. document = value; document.DocumentChanged += new EventHandler(RefreshList); printDoc.PrintPage += new PrintPageEventHandler(PrintDoc); RefreshList(this, null); } get { return document; } } private PrintDocument printDoc = new PrintDocument(); public OrderPrintPreview(Order document) : this() { // Store a reference to the document, attach the document event handlers, // and refresh the display. Document = document; } private void RefreshList(object sender, System.EventArgs e) { RefreshList(); } private void RefreshList() { Preview.Document = printDoc; Preview.InvalidatePreview(); } // Tracks placement while printing. private int itemNumber; // The print font. private Font printFont = new Font("Tahoma", 14, FontStyle.Bold);

The next Seq function you ll look at is a clever function that allows you to do a filter and a map at the same time. This function is called choose and has the type ('a -> 'b option) -> #seq<'a> -> seq<'b>. To do this, the function that is passed to choose must return an option type. If the element in the list can be transformed into something useful, the function should return Some containing the new value. When the element is not wanted, the function returns None. In the following example, you ll take a list of floating-point numbers and multiply them by 2. If the value is an integer, it is returned. Otherwise, it is filtered out. This leaves you with just a list of integers.

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