takes the rst line of this event-handler step-by-step in Visual Basic .NET

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Table 81 takes the rst line of this event-handler step-by-step
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Table 81
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8 n WinForms Applications
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Breaking down an event-handler s rst line The event-handler is a sub that is private to the Form class ie we could not call this event-handler from code outside the class de nition While there is nothing to stop us from changing the declaration from Private to any other access type, it could lead to confusing code The name generated for the handler is simply formed by adding the name of the event handled to the name of the control that handles it We can change this name if we wish, although generally the name provided is a good reminder of what this sub is for Sender is a reference variable indicating the actual control that sourced the event We can if we wish use the same event-handler to respond to a large number of possible events by appending them to the Handles list at the end of the line This parameter allows us to determine which was the cause Any arguments to the event are passed here for example, the current mouse position for a mouse-related event, the key that has been pressed, etc The object referenced by e will often be of a class that descends from SystemEventArgs, since EventArgs has no member elds to contain event data This is the actual link to the object ring the event and the event red If the name of Button1 is changed in the Properties window, the object name here will be changed by the Form Designer, but the sub name will remain unchanged The Handles keyword can be followed by a comma separated list of object events, in which case the event-handler will re for any of them
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Private Sub
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ByVal sender As SystemObject,
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ByVal e As SystemEventArgs)
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In addition to generating code for the form and the objects placed on it, the Form Designer is also responsible for making code changes to re ect any property changes you make as you design a form An obvious example of this happens if you change the name of a control, since the associated variable declaration must be changed to match, and the Handles list of any event-handlers associated with it must also be updated Other changes to properties will be re ected in the form s InitializeComponent sub As you can see, the Form Designer takes care of a lot of detail when you build and edit the visual face of a form While you could do any or all of this coding by hand, Visual Studio and the Form Designer provide an accurate match between visual appearance, property settings and the code that would make this a task of unnecessary drudgery
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832 Code Attributes
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Even for a very simple form with a single button on it, Visual Studio s Form Designer does a lot of work which otherwise you would have to do As you might expect, there has to be a strong link between the Form Designer and the code to allow this to happen, which brings us to the rather odd statement that you can see in both Listings 87 and 88:
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<SystemDiagnosticsDebuggerStepThrough()> _ Private Sub InitializeComponent()
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84 Tools for Creating a User-Interface
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This statement steps out of the bounds of the Visual Basic NET language as a plain programming language and into a whole new arena self-describing program code Visual Basic (and the other NET languages) supports the notion of code attributes, which are parts added to statements that the NET compiler uses to control the type of code that it generates, or to pass on information that will be of use to other software that works with the code Attributes in Visual Basic NET are placed in <> brackets, sometimes at the start of a statement as here, and sometimes within a statement A range of pre-de ned attributes are available within NET and Visual Studio, and you can de ne your own attributes to add description to code if you wish In this case, the SystemDiagnosticsDebuggerStepThrough() attribute is used to pass on information to the debugger that tells it how to deal with this code (a Debug Step Into operation will not automatically stop in this code unless a breakpoint is placed in it) Generally, Visual Studio will append one of a range of attributes to code automatically so that it or other software knows how to deal with the code You can ignore these attributes unless you intend to write programming tools However, you can devise attributes for your own purposes; for example, to assist in documenting your program code You will meet attributes again when we come to look at serialization in 11
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