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Properties
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few months ago, writing some code, we came up with a situation where one of the fields in a class (Filename) could be derived from another (Name). We therefore decided to use the property idiom (or design pattern) in C++ and wrote a getFilename() function for the field that was derived from the other. We then had to walk through all the code and replace the reference to the field with calls to getFilename(). This took a while, since the project was fairly big. We also had to remember that when we wanted to get the filename, we had to call the getFilename() member function, rather than merely referring to the Filename member of the class. This made the model a bit tougher to grasp; instead of Filename just being a field, we had to remember that we were really calling a function whenever we needed to access it. Similarly, we needed to call a setFilename() function to set the value of filename. That getFilename() and setFilename() are logically related to a single virtual field isn t obvious when looking at a class, especially when class members are listed alphabetically, as they usually are. The property pattern is good for the author of a class but a bit clunky for the user of the class. C# adds properties as first-class citizens of the language. Properties appear to be fields to the user of a class, but they use a block of code (known as an accessor) to get the current value and set a new value. You can separate the user model (a field) from the implementation model (a member function), which reduces the amount of coupling between a class and the users of a class, leaving more flexibility in design and maintenance. In the .NET runtime, properties are implemented using a naming pattern and a little bit of extra metadata linking the member functions to the property name. This allows properties to appear as properties in some languages and merely as member functions in other languages. Properties are used heavily throughout the .NET Framework; in fact, there are few (if any) public fields.
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A property consists of a property declaration and either one or two blocks of code known as accessors1 that handle getting or setting the property. Here s a simple example:
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1. In some languages/idioms, a set accessor is also known as a mutator. 169
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C H A P T E R 1 9 PROPERTIES
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class Test { private string name; public string Name { get { return name; } set { name = value; } } } This class declares a property called Name and defines both a getter and a setter for that property. The getter merely returns the value of the private variable, and the setter updates the internal variable through a special parameter named value. Whenever the setter is called, the variable value contains the value to which the property should be set. The type of value is the same as the type of the property. Properties can have a getter, a setter, or both. A property that has only a getter is called a read-only property, and a property that has only a setter is called a write-only property.
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Properties and Inheritance
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Like member functions, properties can also be declared using the virtual, override, or abstract modifiers. These modifiers are placed on the property and affect both accessors. When a derived class declares a property with the same name as in the base class, it hides the entire property; it isn t possible to hide only a getter or setter.
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Use of Properties
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Properties separate the interface of a class from the implementation of a class. This is useful when the property is derived from other fields and when you want to do lazy initialization and fetch a value only if the user really needs it. Suppose that a carmaker wanted to be able to produce a report that listed some current information about the production of cars:
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