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Figure 13-7. Debugging an arbitrary form in design mode The amazing thing about this designer form is that not only can you change properties using the PropertyGrid, but you can also drag, resize, and remove controls. (Smart tags and some other details don t work in the current implementation, however.) Keep in mind that as you make these changes, you re working with a copy of your form, not changing the actual code in your project. Of course, there s no substitute for testing design-time support in the host that s used by almost every Windows developer Visual Studio. So why not debug the Visual Studio IDE itself To accomplish this, add your control to the toolbox, and then configure your custom control project to start Visual Studio (devenv.exe) when you run your project, as shown in Figure 13-8. Now when you run your project, it launches a second instance of Visual Studio. You can now set breakpoints in your control code or custom designer code that will be triggered as the control is manipulated in the IDE.

As an example of the power of the various methods, consider the following code, which compacts the frequency code into a couple of lines of source code. int FrequencyOfANumberFunc(int numberToSearch) { return _tickets.SelectMany( (ticket) => ticket.Numbers ).Where((num) => num == numberToSearch).Count(); } Here, each ticket is iterated by calling the SelectMany() method. This returns an array of numbers, which represents the drawn numbers. The purpose of SelectMany() is to combine the individual arrays of numbers into a large array of numbers. The code then calls Where() to filter out only those numbers that equal the number to search for, and finally the Count() method is called to return the number of found values. The following sections present examples of using the extension methods with LINQ. They are in the LINQExamples project, which is a console application.

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When you configure control properties in the Properties window, Visual Studio needs to be able to create the corresponding code statements in the InitializeComponent() method of the containing form. This process is called code serialization, and it often works automatically without a hitch. However, there s a fair bit you can do to optimize the process, and there s additional work you ll need to undertake if you use properties that are, themselves, complex types.

The ref type is a useful way to share mutable values between several functions. An identifier can be bound to a ref type defined in scope that is common to all functions that want to use the value; then the functions can use the value of the identifier as they like, changing it or merely reading it. Because you can pass around functions in F# as if they were values, the value follows the function everywhere it goes. This process is known as capturing a local or creating a closure. The next example demonstrates this by defining three functions: inc, dec, and show, which all share a common ref type holding an integer. The functions inc, dec, and show are all defined in their own private scopes and then returned to the top level as a tuple, so they are visible everywhere. Note how n is not returned; it remains private, but inc, dec, and show are all still able to access n. This is a useful technique for controlling what operations can take place on mutable data: // capute the inc, dec and show funtions let inc, dec, show = // define the shared state let n = ref 0 // a function to increment let inc () = n := !n + 1 // a function to decrement let dec () = n := !n - 1 // a function to show the current state let show () = printfn "%i" !n // return the functions to the top level inc, dec, show // test the functions inc() inc() dec() show() Executing the preceding code produces the following result: 1

The basic serialization rules that Visual Studio follows are quite simple. Essentially, Visual Studio inspects the public read/write properties of a control and generates the corresponding statements that set them. Visual Studio doesn t respect the order in which you actually set the properties at design time. Instead, it simply sets properties in alphabetical order. For example, if you drop a straightforward button onto a form, you ll generate serialized code that looks like this: ' ' button1 ' Me.button1.Location = New System.Drawing.Point(84, 122) Me.button1.Name = "button1" Me.button1.Size = New System.Drawing.Size(85, 23) Me.button1.TabIndex = 0 Me.button1.Text = "Submit"

Note In all of the examples, I have taken shortcuts for simplicity. So you will see some coding practices

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