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The TreeViewCancelEventArgs class is a CancelEventArgs object that contains event data for events in the TreeView class that occur before an operation takes place. The event handler receiving this class has the opportunity to cancel the operation by setting the inherited Cancel property to true. This class is part of the System.Windows.Forms namespace, and inherits from the System.ComponentModel.CancelEventArgs class. Action Public Properties Node Gets the TreeNode object that is the target of the current operation. Gets the TreeViewAction enumeration member representing the action that caused this event to occur.

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Let s get back to our application and make use of some of these constructs. We would like to insert a set of nodes for the photos in an album whenever the album node is expanded. We can do this by handling the BeforeExpand event for our tree.

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files have no knowledge of it and are unable to alter its contents directly; thus it is not subject to side effects For the few situations where a local static cannot do the job, you can create a small file that contains only the functions that need the static global variable, separately compile that file, and use it without fear of side effects To see how a static global variable can be used, the series generator example from the previous section is recoded so that a starting seed value can be used to initialize the series through a call to a second function called series_start( ) The entire file containing series( ), series_start( ), and series_num follows:

Before we actually do this, a utility method to open a PhotoAlbum using a given album node will turn out to be useful here and later on in the chapter. We will create this method first.

/* This must all be in one file - preferably by itself */ static int series_num; int series(void); void series_start(int seed); int series(void) { series_num = series_num + 23; return series_num; } /* initialize series_num */ void series_start(int seed) { series_num = seed; }

Calling series_start( ) with some known integer value initializes the series generator After that, calls to series( ) will generate the next element in the series To review: The names of static local variables are known only to the function or block of code in which they are declared; the names of static global variables are known only to the file in which they reside This means that if you place the series( ) and series_start( ) functions in a separate file, you can use the functions, but you cannot reference the variable series_num It is hidden from the rest of the code in your program In fact, you may even declare and use another variable called series_num in your program (in another file, of course) and not confuse anything In essence, the static modifier permits variables that are known only to the functions that need them, without unwanted side effects By using static variables, you can hide portions of your program from other portions This can be a tremendous advantage when trying to manage a very large and complex program The static storage specifier lets you create generalized functions that can go into libraries for later use

CREATE AN OPENTREEALBUM METHOD Action 1 In the MainForm.cs code window, create a new OpenTreeAlbum method that accepts a TreeNode object and returns an album. Begin this method by opening the album associated with the node.

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