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Default values must be constant values known at compile time This means that you can set default values for parameters of types that C# considers to be primitive types, as shown in Table 5-1 in 5, Primitive, Reference, and Value Types This also includes enumerated types, and any reference type can be set to null For a parameter of an arbitrary value type, you can set the default value to be an instance of the value type, with all its fields containing zeroes You can use the default keyword or the new keyword to express this; both syntaxes produce identical Intermediate Language (IL) code Examples of both syntaxes are used by my M method for setting the default value for the dt parameter and guid parameter, respectively Be careful not to rename parameter variables because any callers who are passing arguments by parameter name will have to modify their code .

What s the reason for the bizarre formatting of the Else clauses at the end of the example They re consistently indented under the corresponding keywords, but it s hard to argue that their indentations clarify the logical structure. And if the code were modified so that the length of the first line changed, the endline style would require that the indentation of corresponding statements be changed. This

Table 2.1 lists several popular source control systems; you can use it as a reference for your decision making.

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For example, in the declaration of my M method, if I rename the dt variable to dateTime, then my third call to M in the earlier code will cause the compiler to produce the following message: "error CS1739: The best overload for 'M' does not have a parameter named 'dt'" Be aware that changing a parameter s default value is potentially dangerous if the method is called from outside the module A call site embeds the default value into its call If you later change the parameter s default value and do not recompile the code containing the call site, then it will call your method passing the old default value You might want to consider using a default value of 0/null as a sentinel to indicate default behavior; this allows you to change your default without having to recompile all the code with call sites .

poses a maintenance problem that pure block, pure-block emulation, and using begin-end to designate block boundaries do not. You might think that these examples are contrived just to make a point, but this style has been persistent despite its drawbacks. Numerous textbooks and programming references have recommended this style. The earliest book I saw that recommended this style was published in the mid-1970s and the most recent was published in 2003. Overall, endline layout is inaccurate, hard to apply consistently, and hard to maintain. You ll see other problems with endline layout throughout the chapter.

Here is an example:.

// Don t do this: private static String MakePath(String filename = "Untitled") { return String.Format(@"C:\{0}.txt", filename); } // Do this instead: private static String MakePath(String filename = null) { // I am using the null-coalescing operator ( ) here; see 19 return String.Format(@"C:\{0}.txt", filename "Untitled"); }

If you re working in Visual Basic, use pure-block indentation. (The Visual Basic IDE makes it hard not to use this style anyway.) In Java, standard practice is to use pure-block indentation. In C++, you might simply choose the style you like or the one that is preferred by the majority of people on your team. Either pure-block emulation or beginend block boundaries work equally well. The only study that has compared the two styles found no statistically significant difference between the two as far as understandability is concerned (Hansen and Yim 1987). Neither of the styles is foolproof, and each requires an occasional reasonable and obvious compromise. You might prefer one or the other for aesthetic reasons. This book uses pure block style in its code examples, so you can see many more illustrations of how that style works just by skimming through the examples. Once you ve chosen a style, you reap the most benefit from good layout when you apply it consistently.

You cannot set default values for parameters marked with either the ref or out keywords because there is no way to pass a meaningful default value for these parameters .

For details on documenting control structures, see Commenting Control Structures in Section 32.5. For a discussion of other aspects of control structures, see s 14 through 19.

Table 2.1 Important source control aspects of several different tools Subversion Free vs. paid Centralized vs. distributed Transactional vs. nontransactional File blocking vs. non file blocking Free Centralized TFS Version Control $ Centralized $ Centralized Visual SourceSafe Free Distributed Git $ Centralized Vault

There are some additional rules and guidelines that you should know about when calling a method using optional or named parameters:

The layout of some program elements is primarily a matter of aesthetics. Layout of control structures, however, affects readability and comprehensibility and is therefore a practical priority.

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