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UI applications revolve around events, and F# provides a natural way to process events with functions. Graphical interfaces are often developed using visual editors, in particular to build GUIs by assembling controls. Applications, however, often need drawing capabilities for displaying and manipulating data, which requires custom programming to augment available controls. In this chapter, we discuss how to develop graphical applications with F# and why the functional traits of the language suit the event-driven programming paradigm typical of GUIs. To develop our applications, we will use the Windows Forms library, which is a graphical toolkit designed by Microsoft for implementing graphical applications on the .NET platform; this library relies on the GDI+ interface used to develop Windows applications. Other toolkits are also available for programming GUIs with .NET such as GTK#, which is a managed library for writing applications based on the GTK toolkit. These libraries share a similar design with Windows Forms, and you can easily adapt the notions presented in this chapter to these frameworks.

integers, strings, and System.DateTime values are immutable, and the F# library defines a range of immutable data structures such as Set and Map, based on binary trees. Immutable values offer many advantages. At first it may seem strange to define values you can t change. However, knowing a value is immutable means you rarely need to think about the value s object identity you can pass such values to routines and know they won t be mutated. You can also pass them between multiple threads without worrying about unsafe concurrent access to the values, discussed in 13.

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Listing 4-7. Output of the SHOW FULL PROCESSLIST Command mysql> SHOW FULL PROCESSLIST \G *************************** 1. row *************************** Id: 7 User: root Host: localhost:1175 db: test Command: Query Time: 0 State: NULL Info: SHOW FULL PROCESSLIST 1 row in set (0.00 sec) This example shows that I am the only user connected (root) running from the local host executing a query with an execution time of 0 and the command I am currently executing. The downside to this command is that it is a snapshot in time and must be run many times to detect patterns of performance bottlenecks. Fortunately, there is a way to do this. You can use a tool called mytop that repeatedly calls the command and displays several useful views of the data. For more information or to download mytop, see Jeremy Zawodny s web site (http://jeremy. zawodny.com/mysql/mytop).

It s traditional to start with a Hello, World! application, so we ll honor that and begin with a simple program that provides a button to display the magic phrase when clicked: open System.Windows.Forms Application.EnableVisualStyles() let form = new Form(Text="Hello World WinForms") let button = new Button(Text="Click Me!", Dock=DockStyle.Fill) button.Click.Add(fun _ -> MessageBox.Show("Hello, World!", "Hey!") |> ignore) form.Controls.Add(button) form.Show() Even in its simplicity, the application captures many traits typical of GUI applications. After opening the namespace associated with Windows Forms, you enable the Windows XP or Vista look of the application through the call to the static method EnableVisualStyles of the Application

F# is a typed language, so it s reasonable to ask what the type of wordCount is. F# Interactive has shown it already: val wordCount : string -> int * int This indicates that wordCount takes one argument of type string and returns int * int, which is F# s way of saying a pair of integers. The keyword val stands for value, and the symbol -> indicates that wordCount is a function. No explicit type is given in the program for the type of the argument text, because the full type for wordCount is inferred from its definition. We discuss type inference further in the What Is Type Inference sidebar and in more detail in later chapters. Types are significant in both F# and .NET programming more generally for reasons that range from performance to coding productivity and interoperability. Types are used to help structure libraries, to guide you through the complexity of an API, and to place constraints on code to ensure that it can be implemented efficiently. Unlike in many other typed languages, F# s type system is both simple and powerful because it uses orthogonal, composable constructs such as tuples and functions to form succinct and descriptive types. Furthermore, type inference means you almost never have to write types in your program, although doing so can be useful. Table 2-1 shows some of the most important type constructors. s 3 and 4 discuss all these types in more detail. Table 2-1. Some Important Types and Type Constructors and Their Corresponding Values

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