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// Do all the static initializations.
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Other important things you should know about static constructors are the following: A class can have both static and instance constructors. As with static methods, a static constructor cannot access non-static members of its class, and therefore cannot use the this accessor. Static constructors cannot be called by your program. They are called automatically by the system Before any instance of the class is created Before any static member of the class is referenced
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CHAPTER 6 MORE ABOUT CLASSES
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Example of a Static Constructor
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The following code uses a static constructor to initialize a private static field named RandomKey of type Random. Random is a class provided by the BCL to produce random numbers. It is in the System namespace. class RandomNumberClass { private static Random RandomKey; static RandomNumberClass() { RandomKey = new Random(); } public int GetRandomNumber() { return RandomKey.Next(); } } class Program { static void Main() { RandomNumberClass a = new RandomNumberClass(); RandomNumberClass b = new RandomNumberClass(); Console.WriteLine("Next Random #: {0}", a.GetRandomNumber()); Console.WriteLine("Next Random #: {0}", b.GetRandomNumber()); } } One execution of the preceding code produced the following output: Next Random #: 47857058 Next Random #: 1124842041
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// Private static field // Static constructor // Initialize RandomKey
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Accessibility of Constructors
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Access modifiers can be assigned to constructors just as they can to other members. Notice that in the examples, the constructors have been declared public so that you can create instances from outside the class. You can also create private constructors, which cannot be called from outside the class, but can be used from within the class, as you shall see in the next chapter (which covers inheritance).
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CHAPTER 6 MORE ABOUT CLASSES
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Finalizers
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Finalizers perform actions required to clean up or release unmanaged resources before an instance of a class is destroyed. The important things to know about finalizers are the following: You can only have a single finalizer per class. A finalizer cannot have parameters. A finalizer cannot have accessibility modifiers. A finalizer has the same name as the class, but is preceded by a tilde character (pronounced TIL-duh). A finalizer only acts on instances of classes. Hence, there are no static finalizers. A finalizer cannot be called explicitly by your code. It is called in the garbage collection process, when your class is no longer accessible. For example, the following code illustrates the syntax for a finalizer of a class called Class1: Class1 { ~Class1() { CleanupCode } ... } Some important guidelines for using finalizers are the following: Don t implement a finalizer if you don t need one. They can incur performance costs. A finalizer should only release external resources that the object owns. It should not access other objects. Since it cannot be called explicitly, make it less visible by not declaring it with public access.
// The finalizer
CHAPTER 6 MORE ABOUT CLASSES
Calling the Finalizer
Unlike the C++ destructor, a C# finalizer is not called immediately when an instance goes out of scope. In fact, there is no way of knowing when the finalizer will be called. Furthermore, as mentioned, you cannot explicitly call a finalizer. If your code needs one, you just provide it for the system, which will call it at some point before the object is destroyed. If your code contains unmanaged resources that should be released in a timely manner, you should not leave that for the finalizer, since there is no guarantee that the finalizer will run anytime soon. Instead, you should adopt the convention of encapsulating the cleanup code for these resources in a void, parameterless method. By convention, you should call it Dispose. When you re done with the resources and want them released, call Dispose. Notice that you need to invoke Dispose it is not the finalizer, and the system will not call it for you automatically. Some guidelines for your Dispose method are the following: Implement the code in Dispose in such a way that it is all right if the method is called more than once. It should not cause an exception to be raised, and it should not do any additional work on subsequent calls. Don t assume that Dispose will get called. Make sure that the finalizer will release the resources if, for some reason, Dispose isn t called.
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