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UPDATE DISPLAYMODE ENUMERATION Action 9 10 Locate the DisplayMode definition in the MainForm.cs source file. Add a ScaleToFit value and adjust the settings to match the Image submenu. Set the default value for the _selectedMode field to the new setting. Result

The value of i is: 0

As the output verifies, i is initialized to zero Remember, without the use of new, i would be uninitialized, and it would cause an error to attempt to use it in the WriteLine( ) statement without explicitly giving it a value first In general, invoking new for a value type invokes the default constructor for that type It does not, however, dynamically allocate memory Frankly, most programmers do not use new with the value types

private enum DisplayMode { ScaleToFit = 0, StretchToFit = 1, ActualSize = 2 } private DisplayMode _selectedMode = DisplayMode.ScaleToFit;

As you have seen, objects are dynamically allocated from a pool of free memory by using the new operator Of course, memory is not infinite, and the free memory can be exhausted Thus, it is possible for new to fail because there is insufficient free memory to create the desired object For this reason, one of the key components of any dynamic allocation scheme is the recovery of free memory from unused objects, making that memory available for subsequent reallocation In many programming languages, the release of previously allocated memory is handled manually For example, in C++, the delete operator is used to free memory that was allocated However, C# uses a different, more trouble-free approach: garbage collection C# s garbage collection system reclaims objects automatically occurring transparently, behind the scenes, without any programmer intervention It works like this: When no references to an object exist, that object is assumed to be no longer needed, and the memory occupied by the object is eventually released and collected This recycled memory can then be used for a subsequent allocation Garbage collection occurs only sporadically during the execution of your program It will not occur simply because one or more objects exist that are no longer used Thus, you can t know, or make assumptions about, precisely when garbage collection will take place

684 9943 0101 999 17783 18495

We also need to check each place in the code where this enumerator is used. If you do a search, you will discover the _selectedMode field in menuImage_Popup, menuImage_ChildClick, and OnPaint. The popup event is not affected by this change, but the click handler requires a change to its switch block.

As powerful and useful as inheritance is, sometimes you will want to prevent it For example, you might have a class that encapsulates the initialization sequence of some specialized hardware device, such as a medical monitor In this case, you don t want users of your class to be able to change the way the monitor is initialized, possibly setting the device incorrectly Whatever the reason, in C# it is easy to prevent a class from being inherited by using the keyword sealed To prevent a class from being inherited, precede its declaration with sealed As you might expect, it is illegal to declare a class as both abstract and sealed because an abstract class is incomplete by itself and relies upon its derived classes to provide complete implementations Here is an example of a sealed class:

sealed class A { // } // The following class is illegal class B : A { // ERROR! Can't derive from class A // }

protected void menuImage_ChildClick (object sender, System.EventArgs e) { . . . switch (_selectedMode) { default: case DisplayMode.ScaleToFit: // Scale image to fit display area this.Invalidate(); break; case DisplayMode.StretchToFit: . . . } . . . }

As the comments imply, it is illegal for B to inherit A because A is declared as sealed One other point: sealed can also be used on virtual methods to prevent further overrrides For example, assume a base class called B and a derived class called D A method declared virtual in B can be declared sealed by D This would prevent any class that inherits D from overriding the method This situation is illustrated by the following:

the MainForm.cs source file. 13 Add the new display mode to the switch statement, and make it the default.