Passing a Variable Parameter List in Visual C#

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Listing 414 Passing a Variable Parameter List
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using SystemIO; class PathEx { static void Main() { string fullName; // // Call Combine() with four parameters fullName = Combine( DirectoryGetCurrentDirectory(), "bin", "config", "indexhtml"); ConsoleWriteLine(fullName); // // Call Combine() with only three parameters fullName = Combine( EnvironmentSystemDirectory, "Temp", "indexhtml"); ConsoleWriteLine(fullName); // // Call Combine() with an array fullName = Combine( new string[] { "C:\", "Data", "HomeDir", "indexhtml"} ); ConsoleWriteLine(fullName); // } static string Combine(params string[] paths) { string result = stringEmpty; foreach (string path in paths) { result = SystemIOPathCombine(result, path); } return result; } }
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Output 48 shows the results of Listing 414
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Output 48
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C:\Data\mark\bin\config\indexhtml C:\WINDOWS\system32\Temp\indexhtml C:\Data\HomeDir\indexhtml
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In the first call to Combine(), four parameters are specified The second call contains only three parameters In the final call, parameters are passed using an array In other words, the Combine() method takes a variable number of parameters, whether separated by a comma or as a single array To allow this, the Combine() method
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1 Places params immediately before the last parameter in the method declaration 2 Declares the last parameter as an array With a parameter array declaration, it is possible to access each parameter as a member of the params array In the Combine() method implementation, you iterate over the elements of the paths array and call SystemIOPathCombine() This method automatically combines the parts of the path, appropriately using the platform-specific directory-separator-character (PathExCombine() is identical to PathCombine(), except that PathExCombine() handles a variable number of parameters rather than simply two) There are a few notable characteristics of the parameter array The parameter array is not necessarily the only parameter on a method However, the parameter array must be the last parameter in the method declaration Since only the last parameter may be a parameter array, a method cannot have more than one parameter array The caller can specify zero parameters for the parameter array, which will result in an array of zero items Parameter arrays are type safethe type must match the type identified by the array The caller can use an explicit array rather than a comma-separated list of parameters The resulting CIL code is identical If the target method implementation requires a minimum number of parameters, then those parameters should appear explicitly within the method declaration, forcing a compile error instead of relying on runtime error handling if required parameters are missing For example, use int Max(int first, params int[] operads) rather than int Max(params int[] operads) so that at least one value is passed to Max() Using a parameter array, you can pass a variable number of parameters of the same type into a method The section Method Overloading, later in this chapter, discusses a means of supporting a variable number of parameters that are not necessarily of the same type
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Recursion
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Calling a method recursively or implementing the method using recursion refers to the fact that the method calls back on itself This is sometimes the simplest way to implement a method Listing 415 counts the lines of all the C# source files (*cs) in a directory and its subdirectory
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Listing 415 Returning All the Filenames, Given a Directory
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using SystemIO; public static class LineCounter { // Use the first argument as the directory // to search, or default to the current directory public static void Main(string[] args) { int totalLineCount = 0; string directory; if (argsLength > 0) { directory = args[0]; } else { directory = DirectoryGetCurrentDirectory(); } totalLineCount = DirectoryCountLines(directory); SystemConsoleWriteLine(totalLineCount); } static int DirectoryCountLines(string directory) { int lineCount = 0; foreach (string file in DirectoryGetFiles(directory, "*cs")) { lineCount += CountLines(file); } foreach (string subdirectory in DirectoryGetDirectories(directory)) { lineCount += DirectoryCountLines(subdirectory); } return lineCount; } private static int CountLines(string file) { string line; int lineCount = 0;
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FileStream stream = new FileStream(file, FileModeOpen); StreamReader reader = new StreamReader(stream); line = readerReadLine(); while(line != null) { if (lineTrim() != "") { lineCount++; } line = readerReadLine(); } readerClose(); streamClose(); return lineCount; } }
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