Chapter 11: Improving Productivity with Named and Optional Parameters

In This Chapter

check.png Distinguishing between named and optional parameters

check.png Using optional parameters

check.png Implementing reference types

check.png Declaring Output parameters

Parameters, as you probably remember, are the inputs to methods. They’re the values that you put in so that you get a return value. Sometimes, the return values are parameters, too, which confuses things.

In the world of C# and most C-derived languages, parameters can’t be optional. Instead of making parameters optional, you are just expected to make a separate overload for every version of the method that you expect your users to need.

This pattern works fairly well, but there are still a lot of problems. Many VB programmers point to the flexible parameterization as a strong reason to use VB over C#.

C# 4.0 has optional parameters. Optional parameters are parameters that have a default value right in the method signature — just like the VB.NET implementation. This is one more step toward language parity, and again in the name of COM programming.

It’s the same ...

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