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9 Parameters
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in which you want to leave yourself some flexibility to change what your method returns, choose a weaker return type . For example:
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// Flexible: This method uses a weaker return type public IList<String> GetStringCollection() { ... } // Inflexible: This method uses a stronger return type public List<String> GetStringCollection() { ... }
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In this example, even though the GetStringCollection method uses a List<String> object internally and returns it, it is better to prototype the method as returning an IList<String> instead . In the future, the GetStringCollection method could change its internal collection to use a String[], and callers of the method won t be required to change any of their source code . In fact, they won t even have to recompile their code . Notice in this example that I m using the strongest of the weakest types . For instance, I m not using an IEnumerable<String> or even ICollection<String> .
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Const-ness
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In some languages, such as unmanaged C++, it is possible to declare methods or parameters as a constant that forbids the code in an instance method from changing any of the object s fields or prevents the code from modifying any of the objects passed into the method . The CLR does not provide for this, and many programmers have been lamenting this missing feature . Since the CLR doesn t offer this feature, no language (including C#) can offer this feature . First, you should note that in unmanaged C++, marking an instance method or parameter as const ensured only that the programmer could not write normal code that would modify the object or parameter . Inside the method, it was always possible to write code that could mutate the object/parameter by either casting away the const-ness or by getting the address of the object/argument and then writing to the address . In a sense, unmanaged C++ lied to programmers, making them believe that their constant objects/arguments couldn t be written to even though they could . When designing a type s implementation, the developer can just avoid writing code that manipulates the object/arguments . For example, strings are immutable because the String class doesn t offer any methods that can change a string object . Also, it would be very difficult for Microsoft to endow the CLR with the ability to verify that a constant object/argument isn t being mutated . The CLR would have to verify at each write that the write was not occurring to a constant object, and this would hurt performance significantly . Of course, a detected violation would result in the CLR throwing an exception . Furthermore, constant support adds a lot of complexity for developers . For example, if a type is immutable, all derived types would have to respect this . In addition, an immutable type would probably have to consist of fields that are also of immutable types . These are just some of the reasons why the CLR does not support constant objects/arguments .
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10
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Properties
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In this chapter: Parameterless Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parameterful Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Performance of Calling Property Accessor Methods . . . . . . . . . . . . . . . . . . Property Accessor Accessibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generic Property Accessor Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 252 257 258 258
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In this chapter, I ll talk about properties . Properties allow source code to call a method by using a simplified syntax . The common language runtime (CLR) offers two kinds of properties: parameterless properties, which are simply called properties, and parameterful properties, which are called different names by different programming languages . For example, C# calls parameterful properties indexers, and Microsoft Visual Basic calls them default properties . I ll also talk about initializing properties using object and collection initializers as well as ways to package a bunch of properties together using C# s anonymous types and the System.Tuple type .
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