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The corollary to this is that because PowerShell is part of the .NET ecosystem, as Microsoft (and third parties) add new capabilities to the .NET ecosystem, PowerShell benefits directly.
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This example also illustrates a number of useful techniques for converting between data formats, generating HTML, and so on. So far we ve written scripts that act as web clients and then a script that acts as a web server. At this point, the next logical step is to write a script that acts as an operating
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CHAPTER 1 1
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GETTING FANCY .NET AND WINFORMS
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system kernel. In the next section, we ll look at replacing portions of the Windows kernel with PowerShell scripts. Okay I am totally lying to you. Sorry. What we re really going to talk about is writing graphical client applications. Not as exotic as an operating system kernel, but a great deal more practical.
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GRAPHICAL USER INTERFACES
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The full name of the PowerShell package is Windows PowerShell. In this section, we ll look at the Windows part of the name. (The name is actually because PowerShell is part of the Windows product group. But we can do GUI programming with PowerShell, as we ll see in ths section.) One of the earliest successful scripting environments was something called TCL/ TK. TCL stands for Tool Command Language. It was intended to be a standard scripting language that could be used to automate systems. (Hmm. This sounds familiar!) Its biggest success, however, was TK, which was (and still is) a toolkit for building graphical applications with scripts. The ability to write a basic graphical application in a few dozen lines of code was wildly popular. This same kind of thing can be done in PowerShell using the .NET Windows Forms (WinForms) library. WinForms is a framework and collection of utility classes for building forms-based graphical applications. Let s review the basic structure of a WinForms application and then see how we can build one using PowerShell.
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WinForms basics The core concepts in WinForms are controls, containers, properties, and events. A control is an element in a user interface buttons, list boxes, and so on. Most controls, like buttons, are visible controls that you interact with directly, but there are some controls, such as timers, that aren t visible but still play a part in the overall user experience. Controls have to be laid out and organized to present a GUI. This is where containers come in. Containers include things such as top-level forms, panels, splitter panels, tabbed panels, and so on. Within a container, you can also specify a layout manager. The layout manager determines how the controls are laid out within the panel. (In TCL/TK, these were called geometry managers.) Properties are just regular properties, except that they are used to set the visual appearance of a control. You use them to set things such as the foreground and background colors or the font of a control. The final piece in the WinForms architecture is the event. Events are used to specify the behavior of a control both for specific actions, such as when a user clicks on the Do It button, as well as when the container is moved or resized and the control has to take some action. In PowerShell, an event corresponds to a scriptblock. If you want a particular event to occur when a button is clicked, you attach a scriptblock to the button click event.
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POWERSHELL AND GRAPHICAL USER INTERFACES
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When an EventHandler is invoked or fired, it s passed at least two arguments: the object that fired the event and any arguments that are specific to that event. The signature of the method that is used to invoke an event handler looks like:
Void Invoke(System.Object, System.EventArgs)
Writing event handlers in WinForms is such a common pattern that PowerShell doesn t require you to explicitly define these arguments for scriptblocks used as event handlers. Instead, we use the automatic variables $this and $_ to pass the System.EventHandler arguments: $this contains a reference to the object that generated the event and $_ holds any event arguments that might have been passed. Note that these arguments get used a lot in PowerShell; as we ll see in the examples, dynamic scoping frequently makes using these variable unnecessary (but they have to be defined anyway to match the EventHandler signature).
These concepts are best illustrated through an example. 11.3.2 Example: "My first form" We ll now look at the simplest WinForms example. This is the example we saw in chapter 1. The code is shown in listing 11.10:
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