Parameters in Visual C#

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Parameters
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Listing 411: Passing Variables by Value
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class Program { static void Main() { // string fullName; string driveLetter = "C:"; string folderPath = "Data"; string fileName = "indexhtml"; fullName = Combine(driveLetter, folderPath, fileName); ConsoleWriteLine(fullName); // } static string Combine( string driveLetter, string folderPath, string fileName) { string path; path = stringFormat("{1}{0}{2}{0}{3}", SystemIOPathDirectorySeparatorChar, driveLetter, folderPath, fileName); return path; } }
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OUTPUT 45:
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C:\Data\indexhtml
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Even if the Combine() method assigns null to driveLetter, folderPath, and fileName before returning, the corresponding variables within Main() will maintain their original values because the variables are copied when calling a method When the call stack unwinds at the end of a call, the copy is thrown away
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ADVANCED TOPIC Reference Types versus Value Types For the purposes of this section, it is inconsequential whether the parameter passed is a value type or a reference type The issue is whether the
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4: Methods and Parameters
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target method can assign the caller s original variable a new value Since a copy is made, the caller s copy cannot be reassigned In more detail, a reference type variable contains an address of the memory location where the data is stored If a reference type variable is passed by value, the address is copied from the caller to the method parameter As a result, the target method cannot update the caller variable s address value but it may update the data within the reference type Alternatively, if the method parameter is a value type, the value itself is copied into the parameter, and changing the parameter will not affect the original caller s variable
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Reference Parameters (ref) Consider Listing 412, which calls a function to swap two values, and Output 46, which shows the results
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Listing 412: Passing Variables by Reference
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class Program { static void Main() { // string first = "first"; string second = "second"; Swap(ref first, ref second); SystemConsoleWriteLine( @"first = ""{0}"", second = ""{1}""", first, second); // } static void Swap(ref string first, ref string second) { string temp = first; first = second; second = temp; } }
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OUTPUT 46:
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first = "second", second = "first"
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Parameters
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The values assigned to first and second are successfully switched, even though there is no return from the Swap() method To do this, the variables are passed by reference The obvious difference between the call to Swap() and Listing 411 s call to Combine() is the use of the keyword ref in front of the parameter s data type This keyword changes the call type to be by reference, so the called method can update the original caller s variable with a new value When the called method specifies a parameter as ref, the caller is required to place ref in front of the variables passed In so doing, the caller explicitly recognizes that the target method could reassign any ref parameters it receives Furthermore, it is necessary to initialize variables passed as ref because target methods could read data from ref parameters without first assigning them In Listing 412, for example, temp is assigned the value of first, assuming that the variable passed in first was initialized by the caller Effectively, a ref parameter is an alias for the variable passed In other words, it is essentially giving a parameter name to an existing variable
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Output Parameters (out) In addition to passing parameters into a method only (by value) and passing them in and back out (by reference), it is possible to pass data out only To achieve this, code needs to decorate parameter types with the keyword out, as shown in the GetPhoneButton() method in Listing 413 that returns the phone button corresponding to a character
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Listing 413: Passing Variables Out Only
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class ConvertToPhoneNumber { static int Main(string[] args) { char button; if(argsLength == 0) { ConsoleWriteLine( "ConvertToPhoneNumberexe <phrase>"); ConsoleWriteLine( "'_' indicates no standard phone button"); return 1;
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