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To remove the extra debug code, we simply compile the release version without the /define:DEBUG option.
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A.15
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ATTRIBUTES
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C# provides a mechanism to specify extra declarative information for various program entities through the use of attributes. This information can be retrieved and used at run time. There are many built-in attributes provided in the .NET Framework, and we make use of many throughout this book. Examples are the AssemblyVersion attribute for specifying the version of an assembly, the Serializable attribute to declare that a type is serializable, RunInstallerAttribute to denote an installable type, and the WebService and WebMethod attributes for Web services. Attributes can be applied to almost all application elements including assemblies, types, methods, parameters. The information declared is stored with the compiled code. At run time it can be extracted using a technique called reflection. (We examine reflection in 2.)
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APPENDIX A
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INTRODUCTION TO C#
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The following example illustrates the use of the Conditional attribute to achieve the same effect as the #if directive:
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using System; using System.Diagnostics; class Go { public static void Main() { Console.Write("Hello. What's your name "); string nm = Console.ReadLine(); debug("user entered " + nm); if (nm.Equals("")) nm = "Stranger"; Console.WriteLine("Hello, " + nm + "!"); } [Conditional("DEBUG")] private static void debug(string msg) { Console.WriteLine("DEBUG: " + msg); } }
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In this case, we include a debug method which is prefixed with the conditional attribute, [Conditional("DEBUG")]. This causes the debug method, and any calls to it, to be compiled into the program only if DEBUG is defined. You can create custom attribute classes to support the insertion and use of specialized declarative information in your own applications.
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A.16
THREADING
Using multiple threads in a program creates the effect of several tasks executing at the same time. C# supports the use of threads and provides several types to support the creation of multi-threaded applications. Listing A.9 provides another example of a ticking clock. This example uses a separate thread for the clock.
Listing A.9 Using threads
using System; using System.Threading; public class ThreadClock { public static void Main() { // create thread start delegate... ThreadStart clockThread = new ThreadStart(startClock); // create thread... Thread t = new Thread(clockThread); Console.WriteLine("starting new thread..."); // start the thread... t.Start();
THREADING
// wait for thread to finish... t.Join(); Console.WriteLine("thread stopped."); } private static void startClock() { Console.WriteLine("running on new thread..."); for (int i = 0; i < 5; i++) { Thread.Sleep(1000); // tick every second Console.WriteLine("Tick!"); } } }
Note the use of the delegate, ThreadStart, to provide a reference to the method to be run by the thread. To start the thread, we call its Start method, while a call to its Join method causes the program to wait for the thread to complete.
A.17
FURTHER RESOURCES
In this appendix, we explored the C# programming language. In addition to the material presented here, you ll find supplementary discussion and many more sample programs throughout the book, as well as a complete case study. You ll also find a complete C# reference and several tutorials in the help documentation provided with both Visual Studio .NET and the .NET SDK, as seen in figure A.1. You ll also find many helpful tutorials and samples at the Microsoft sites: http://msdn.microsoft.com/net, and at http://www.gotdotnet.com.
Figure A.1
.NET SDK C# programmer s reference
APPENDIX A
INTRODUCTION TO C#
The poker engine listings
All the different versions of the video poker machine case study use a common game "engine" implemented as the assembly, poker.dll. This appendix contains the source code for the engine classes, together with a makefile to build the assembly.
THE MAKEFILE
Run nmake from the command line to run the makefile.
poker.dll: bank.cs \ bet.cs \ card.cs \ hand.cs \ machine.cs \ msglog.cs \ simplemachine.cs csc /t:library /out:poker.dll \ bank.cs \ bet.cs \ card.cs \ hand.cs \ machine.cs \ msglog.cs \ simplemachine.cs
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