C# Basics

Now that you understand a little more about what C# can do, you will want to learn how to use it.
This chapter on the basics of C# will give you a good start in that direction by providing you with a basic knowledge of the fundamentals of C# programming, which we will build on in subsequent chapters. The main topics we will be covering are:
❑ Declaring variables
❑ Initialization and scope of variables
❑ Predefined C# data types
❑ Dictating the flow of execution within a C# program using loops and conditional
❑ Enumerations
❑ Namespaces
❑ The Main() method
❑ Basic command line C# compiler options
❑ Using System.Console to perform console I/O
❑ Using documentation features in C# and Visual Studio .NET
❑ C# identifiers and keywords
❑ Recommended guidelines and conventions for good programming in C#.

By the end of this chapter you will know enough C# to write simple programs, though without using inheritance or other object-oriented features, which are covered in the following chapters.

Before We Start

As we have already mentioned, C# is an object-oriented language. As we get you up to speed in the fundamentals
of the C# language, we will be assuming that you have a good grasp of the concepts behind
object-oriented (OO) programming. In other words, we will expect you to understand what we mean
by classes, objects, interfaces, and inheritance. If you have programmed in C++ or Java before, you should
have a pretty good grounding in object-oriented programming (OOP). However, if you do not have a
background in OOP, there are plenty of good sources of information on this subject. You can start with
Appendix A, which presents a detailed introduction to OOP concepts and is posted at www.wrox.com.
We also recommend Beginning Visual C#, the revised edition of Beginning C# for .NET v1.0 (ISBN
0-7645-4382-2) which teaches both object-oriented programming and C# from scratch.
If you are an experienced developer in Visual Basic 6, C++, or Java, you should note that we will make
many comparisons between C#, C++, Java, and Visual Basic 6 as we walk you through the basics of C#.
However, you might prefer to learn C# initially by reading a comparison between C# and your selected
language. If so, we have also made available separate documents for download on the Wrox Press Web
site (www.wrox.com) that give introductions to C# from the point of view of each of those languages.

Our First C# Program
Let’s start in the traditional way by compiling and running the simplest possible C# program—a simple
class consisting of a console application that writes a message to the screen.

The Code
Type the following into a text editor (such as Notepad), and save it with a .cs extension (for example,
using System;
namespace Wrox.ProCSharp.Basics
class MyFirstCSharpClass
static void Main()
Console.WriteLine(“This isn’t at all like Java!”);
The following chapters present a number of code samples. The most common technique for writing C#
programs is to use Visual Studio .NET to generate a basic project and add your own code to it. However,
since the aim of these early chapters is to teach the C# language, we are going to keep things simple and
avoid relying on Visual Studio .NET until Chapter 12. Instead, we will present the code as simple files
that you can type in using any text editor and compile from the command line.

2007-07-14 20:04:00


Ultimele 25 posturi adăugate

09:58:56Wascheschrank Weiss —» Andrei Fornea
09:00:21Sewing Table Ikea —» Andrei Fornea
07:56:36Știri ironice: Puiul de koala, celulele de creier uman și filmele „mizerabile” Marvel —» Andrei Curararu
07:43:14Beniamin Vozan – misionar prin fotbal —» Moldova Creștină
07:09:21Săptămâna Internaţională a Accesului Deschis 2019 —» BiblioCity
01:11:42Moldovenii sunt Campioni Mondiali la Arte Marțiale! Aur pentru moldoveni la Karate, Taekwon-Do, Judo, Greco-romane —» plop andrei
21:21:23Primele rezultate ale alegerilor în diaspora, circumscripiția 50 —» Elena Robu
20:04:20Ce scor obține candidatul Blocului ACUM, Gheorghe Petic la Ungheni —» Elena Robu
19:58:53Nereguli electorale la Lipcani —» Curaj.TV | Media alternativă
17:22:59Conferință despre lifestyle și business pentru tătici și mămici cu pici —» Andrei Albu - omul alb cu gînduri negre
15:51:51Am protestat împotriva creării dosarelor penale false —» Curaj.TV | Media alternativă
14:30:14PROMISIUNE* —» Andrei LANGA. Blogul personal
12:52:15Ce vârstă are pământul? | Creația Uimitoare a lui Dumnezeu —» Moldova Creștină
11:52:04BAU! Frica de întuneric și soluția unei basarabence din Paris! —» Corina Cojocaru
11:52:02Best Living Room Interior —» Andrei Fornea
11:31:20Taylor Digital Scale Reviews —» Andrei Fornea
11:02:07Ziua de judecată —» adevaruri biblice
10:58:34Fabric Sofa Cleaner —» Andrei Fornea
10:58:18Breakfast Table And Chairs —» Andrei Fornea
09:29:48Emoții și oameni dragi la „Offline-ul Aniversar – 4 ani de blogging” —» Planeta Mami
08:43:34A cîntat o piesă de Queen la #WOW2019 —» Curaj.TV | Media alternativă
08:30:04Astăzi, în calitate de locuitor al municipiului Chișinău, mi-am exercitat dreptul la vot —» Igor Dodon
07:35:19Ce semeni aceea vei culege | Editorial de Radu Blendarencu —» Moldova Creștină
07:28:32PROMISIUNE* —» Andrei LANGA. Blogul personal