Simple .NET/ASP.NET PDF document editor web control SDK

Generic let comparer = { new IComparer<string> with Compare(s1, s2) = let rev (s : String) = new String(Arrayrev (sToCharArray())) let reversed = rev s1 reversedCompareTo(rev s2) } let winners = [| "Sandie Shaw" ; "Bucks Fizz" ; "Dana International" ; "Abba"; "Lordi" |] print_any winners print_newline() ArraySort(winners, comparer) print_any winners The results of the previous example, when compiled and executed, are as follows: [|"Sandie Shaw"; "Bucks Fizz"; "Dana International"; "Abba"; "Lordi"|] [|"Abba"; "Lordi"; "Dana International"; "Sandie Shaw"; "Bucks Fizz"|] The previous shows an example of the IComparer interface being implemented This is an interface with one method, Compare, which takes two parameters and returns an integer that represents the result of the parameter comparison It accepts one type parameter; in this case, you pass it a string You can see this on the second line of the definition of the identifier comparer.

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Figure A-3. Components on the solderless breadboard Construction consists of going down row by row in Table A-2 and connecting one component at a time. The start column corresponds to the first listed end of the part and the end corresponds to the last. For example, C1 s start is the positive (+) lead, and the end is the negative ( ) lead. J1, J2, and J3 are just wire jumpers.

Figure 8-7 shows the Ajax Dashboard. It consists of four small windows, each containing a different mini-application. The first window provides a simple seven-day weather forecast for 3565005953993bd3170c41194f12907b any valid U.S. ZIP code by showing the projected high and low temperatures along with the

After this comes the definition of the method body, which in this case compares reversed versions of the string parameters Finally, you use the comparer by defining an array and then sorting using the comparer and displaying the before and after results in the console..

It is possible to implement multiple interfaces or a class and several other interfaces within one object expression. It is not possible to implement more than one class within an object expression. If you are implementing a class and an interface, the class must always come first in the expression. In either case, the implementation of any other interfaces after the first interface or class must come after the definitions of all the methods of the first interface or class. The name of the interface is prefixed by the keyword interface and is followed by the keyword with. The definition of the methods is the same as for the first interface or class. #light open System open System.Drawing open System.Windows.Forms let makeNumberControl (n : int) = { new Control(Tag = n, Width = 32, Height = 16) with override x.OnPaint(e) = let font = new Font(FontFamily.Families.[1], 12.0F) e.Graphics.DrawString(n.ToString(), font, Brushes.Black, new PointF(0.0F, 0.0F)) interface IComparable with CompareTo(other) = let otherControl = other : > Control in let n1 = otherControl.Tag : > int in n.CompareTo(n1) } let numbers = let temp = new ResizeArray<Control>() let rand = new Random() for index = 1 to 10 do temp.Add(makeNumberControl (rand.Next(100))) temp.Sort() let height = ref 0 temp |> IEnumerable.iter (fun c -> c.Top <- !height height := c.Height + !height) temp.ToArray() let numbersForm = let temp = new Form() in temp.Controls.AddRange(numbers); temp [<STAThread>] do Application.Run(numbersForm)

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expected cloud cover for the day. The forecast automatically changes whenever the ZIP code changes, and Ajax automatically refreshes the forecast as long as the window is open within the browser.

The previous example shows the definition of object expression that implements both the class Control and the interface IComparable. IComparable allows objects that implement this interface to be compared, primarily so they can be sorted. In this case, the implementation of IComparable s CompareTo method sorts the controls according to which number they are displaying. After the implementation of the makeNumberControl function, you create an array of controls, numbers. The definition of numbers is a little complicated; first you initialize it to be full of controls in a random order, and then you sort the array. Finally, you ensure each control is displayed at the appropriate height. Object expressions are a powerful mechanism to quickly and concisely introduce objectoriented functionality from objects from non-F# libraries into your F# code. They have the drawback that they do not allow you to add extra properties or methods to these objects. For example, in the previous example, notice how it was necessary to place the number associated with control in the control s Tag property. This is more of a workaround than a proper solution. However, sometimes you don t need extra properties or methods on a type, and this syntax can be very useful then.