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CHAPTER 6 MORE ABOUT CLASSES
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Automatically Implemented Properties
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Because properties are so often associated with backing fields, C# 3.0 has added automatically implemented properties, or auto-implemented properties, which allow you to just declare the property, without declaring a backing field. The important points about auto-implemented properties are the following: You do not declare the backing field the compiler allocates the storage for you, based on the type of the property. You cannot supply the bodies of the accessors they must be declared simply as semicolons. The get acts as a simple read of the memory, and the set as a simple write. You cannot access the backing field other than through the accessors. Since you can t access it any other way, it wouldn t make sense to have read-only or write-only autoimplemented properties so they re not allowed. The following code shows an example of an automatically implemented property: class C1 { No declared backing field public int MyValue // Allocates memory { set; get; } } The bodies of the accessors are declared as semicolons. class Program { static void Main() { Use auto-implemented properties as regular properties. C1 c = new C1(); Console.WriteLine("MyValue: {0}", c.MyValue); c.MyValue = 20; Console.WriteLine("MyValue: } } This code produces the following output: MyValue: MyValue: 0 20
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{0}", c.MyValue);
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CHAPTER 6 MORE ABOUT CLASSES
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Besides being convenient, auto-implemented properties allow you to easily insert a property where you might be tempted to declare a public field. Public fields are generally discouraged because they don t allow you to process the input and output the way you can with accessors. You might, however, be tempted to release a version of the code with a public field, and then in a later release change the field to a property. However, the semantics of a compiled variable and a compiled property are different. If, in a later release, you were to switch from a field to a property, any assemblies accessing that field in the first release would have to be recompiled to use the property. If you use a property in the first place, the client doesn t have to be recompiled.
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CHAPTER 6 MORE ABOUT CLASSES
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Properties can also be declared static. Accessors of static properties, like all static members Cannot access instance members of a class although they can be accessed by them Exist regardless of whether there are instances of the class Must be referenced by the class name, rather than an instance name, when being accessed from outside the class For example, the following code shows a class with a static property called MyValue that is associated with a static field called myValue. In the first three lines of Main, the property is accessed, even though there are no instances of the class. The last line of Main calls an instance method that accesses the property from inside the class. class Trivial { static int myValue; public static int MyValue { set { myValue = value; } get { return myValue; } } public void PrintValue() Accessed from inside the class { Console.WriteLine("Value from inside: {0}", MyValue); } } class Program { static void Main() Accessed from outside the class { Console.WriteLine("Init Value: {0}", Trivial.MyValue); Trivial.MyValue = 10; Accessed from outside the class Console.WriteLine("New Value : {0}", Trivial.MyValue); Trivial tr = new Trivial(); tr.PrintValue(); } }
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Init Value: 0 New Value : 10 Value from inside: 10
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CHAPTER 6 MORE ABOUT CLASSES
Instance Constructors
An instance constructor is a special method that is executed whenever a new instance of a class is created. A constructor is used to initialize the state of the class instance. If you want to be able to create instances of your class from outside the class, you need to declare the constructor public. Figure 6-12 shows the syntax of a constructor. A constructor looks like the other methods in a class declaration, with the following exceptions: The name of the constructor is the same as the name of the class. A constructor cannot have a return value.
Figure 6-12. Constructor declaration For example, the following class uses its constructor to initialize its fields. In this case, it has a field called TimeOfInstantiation that is initialized with the current date and time. class MyClass { DateTime TimeOfInstantiation; ... public MyClass() { TimeOfInstantiation = DateTime.Now; } ... }
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