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The final parameter modifier is the params modifier, which allows you to create a method that may be sent to a set of identically typed arguments as a single logical parameter. Yes, this can be confusing. To clear the air, assume a method that returns the average of any number of doubles: // Return average of 'some number' of doubles. static double CalculateAverage(params double[] values) { double sum = 0; for (int i = 0; i < values.Length; i++) sum += values[i]; return (sum / values.Length); } This method has been defined to take a parameter array of doubles. What this method is in fact saying is, Send me any number of doubles and I ll compute the average. Given this, you can call CalculateAverage() in any of the following ways (if you did not make use of the params modifier in the definition of CalculateAverage(), the first invocation of this method would result in a compiler error): static void Main(string[] args) { // Pass in a comma-delimited list of doubles... double average; average = CalculateAverage(4.0, 3.2, 5.7); Console.WriteLine("Average of 4.0, 3.2, 5.7 is: {0}", average);

sData = ActiveSheet.PivotTables("PivotTable1").SourceData iWhere = InStr(1, sData, "!") sData = Left(sData, iWhere) Set rngData = ActiveWorkbook.Sheets(Left(sData, iWhere - 1)).Cells(1, 1).CurrentRegion ActiveSheet.PivotTables("PivotTable1").SourceData = sData & rngData.Address(, , xlR1C1) End Sub Let s take a look at what this code is doing. We have three variables declared. sData will hold the value of the current range for the PivotTable s source data. We want to find the bang character (!) so we can retrieve the name of the worksheet the data came from. We ll store that in the iWhere variable. And finally, we have a variable of type Range, rngData, that will be assigned the CurrentRegion of cell A1 on the data worksheet. With this information, we have the tools to refresh our pivot data any time detail data is added on the data worksheet. The first step is to get the current data source for the PivotTable: sData = ActiveSheet.PivotTables("PivotTable1").SourceData Next we ll find the ! character: iWhere = InStr(1, sData, "!") Now we want the worksheet name including the !: sData = Left(sData, iWhere)

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Note Though the term hack is used in this chapter, workaround is equally interchangeable. Anything that

// ...or pass an array of doubles. double[] data = { 4.0, 3.2, 5.7 }; average = CalculateAverage(data); Console.WriteLine("Average of data is: {0}", average); Console.ReadLine(); } That wraps up our initial look at parameter modifiers. We ll revisit this topic later in the chapter when we examine the distinction between value types and reference types. Next up, let s check out the iteration and decision constructions of the C# programming language.

All programming languages provide ways to repeat blocks of code until a terminating condition has been met. Regardless of which language you have used in the past, the C# iteration statements should not raise too many eyebrows and should require little explanation. C# provides the following four iteration constructs: for loop foreach/in loop while loop do/while loop Let s quickly examine each looping construct in turn.

When you need to iterate over a block of code a fixed number of times, the for statement is the construct of champions. In essence, you are able to specify how many times a block of code repeats itself, as well as the terminating condition. Without belaboring the point, here is a sample of the syntax: // A basic for loop. static void Main(string[] args) { // Note! 'i' is only visible within the scope of the for loop. for(int i = 0; i < 10; i++) { Console.WriteLine("Number is: {0} ", i); } // 'i' is not visible here. } All of your old C, C++, and Java tricks still hold when building a C# for statement. You can create complex terminating conditions, build endless loops, and make use of the goto, continue, and break keywords. I ll assume that you will bend this iteration construct as you see fit. Consult the .NET Framework 2.0 SDK documentation if you require further details on the C# for keyword.

All in all, this wide array of distributed technologies makes it difficult to pick the right tool for the job This is further complicated by the fact that several of these technologies overlap in the services they provide Even when a NET developer has selected what appear to be the correct technologies for the task at hand, building, maintaining, and configuring such an application is complex at best WCF provides a very clean solution to these problems At its core, WCF builds on top of the success of service-oriented architectures (SOAs) In fact, many terms and concepts used within the WCF programming API map directly (or very closely) to those of XML web services (such as WSDL and SOAP messages) Given this, interoperability between NET, J2EE, and COM applications (on a variety of operating systems) can be quite straightforward.

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