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The compiler automatically generates names for these methods by prepending get_ or set_ to the property name specified by the developer . C# has built-in support for properties . When the C# compiler sees code that s trying to get or set a property, the compiler actually emits a call to one of these methods . If you re using a programming language that doesn t directly support properties, you can still access properties by calling the desired accessor method . The effect is exactly the same; it s just that the source code doesn t look as pretty . In addition to emitting the accessor methods, compilers also emit a property definition entry into the managed assembly s metadata for each property defined in the source code . This entry contains some flags and the type of the property, and it refers to the get and set accessor methods . This information exists simply to draw an association between the abstract concept of a property and its accessor methods . Compilers and other tools can use this metadata, which can be obtained by using the System.Reflection.PropertyInfo class . The CLR doesn t use this metadata information and requires only the accessor methods at runtime .

In each of the cases in Figure 13-1, the pointer points to the location containing the hex value 0x0A. The number of bytes used beyond the 0A depends on how the memory is interpreted. The way memory contents are used also depends on how the memory is interpreted. (It also depends on what processor you re using, so keep that in mind if you try to duplicate these results on your desktopCRAY.) The same raw memory contents can be interpreted as a string, an integer, a floating point, or anything else it all depends on the base type of the pointer that points to the memory.

If you are creating a property to simply encapsulate a backing field, then C# offers a simplified syntax known as automatically implemented properties (AIPs), as shown here for the Name property:

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With many types of defects, locating the error is the easiest part of correcting the error. Correcting it is the hard part. Pointer errors are different. A pointer error is usually the result of a pointer s pointing somewhere it shouldn t. When you assign a value to a bad pointer variable, you write data into an area of memory you shouldn t. This is called memory corruption. Sometimes memory corruption produces horrible, fiery system crashes; sometimes it alters the results of a calculation in another part of the program; sometimes it causes your program to skip routines unpredictably; sometimes it doesn t do anything at all. In the last case, the pointer error is a ticking time bomb, waiting to ruin your program five minutes before you show it to your most important customer. In short, symptoms of pointer errors tend to be unrelated to causes of pointer errors. Thus, most of the work in correcting a pointer error is locating the cause. Working with pointers successfully requires a two-pronged strategy. First, avoid installing pointer errors in the first place. Pointer errors are so difficult to find that extra preventive measures are justified. Second, detect pointer errors as soon after they are coded as possible. Symptoms of pointer errors are so erratic that extra measures to make the symptoms more predictable are justified. Here s how to achieve these key goals:

public sealed class Employee { // This property is an automatically implemented property public String Name { get; set; } private Int32 m_Age;

Isolate pointer operations in routines or classes Suppose you use a linked list in several places in a program. Rather than traversing the list manually each place it s used, write access routines such as NextLink(), PreviousLink(), InsertLink(), and DeleteLink(). By minimizing the number of places in which pointers are accessed, you minimize the possibility of making careless mistakes that spread throughout your program and take forever to find. Because the code is then relatively independent of data-implementation details, you also improve the chance that you can reuse it in other programs. Writing routines for pointer allocation is another way to centralize control over your data. Declare and define pointers at the same time Assigning a variable its initial value close to where it is declared is generally good programming practice, and it s all the more valuable when working with pointers. Here is an example of what not to do:

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