C# Syntax Fundamentals in C#.NET

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Listing 12: Basic Class Declaration
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class HelloWorld { }
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The name used for the type (in this case, HelloWorld) can vary, but by convention, it should begin with a capital letter If the name contains multiple words appended together, then each additional word should also begin with a capital letter For this particular example, therefore, other possible names are Greetings, HelloInigoMontoya, and simply Hello The CLI creators called this type of casing Pascal casing because of its popularity in the Pascal programming language The alternative, camel casing, follows the same convention, except that the first letter is lowercase Examples include quotient, firstName, and theDreadPirateRoberts Generally, programs contain multiple types, each containing multiple methods
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Main BEGINNER TOPIC What Is a Method Syntactically, a method in C# is a named block of code introduced by a method declaration (for example, static void Main()) and followed by zero or more statements within curly braces Methods perform computations and/or actions Similar to paragraphs in written languages, methods provide a means of structuring and organizing code so that it is more readable More importantly, methods avoid the need to duplicate code The method declaration introduces the method and defines the method name along with the data passed to and from the method In Listing 13, Main() followed by { } is an example of a C# method
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The location where C# programs begin execution is the Main method, which begins with static void Main() When you execute the program by typing HelloWorldexe at the command console, the program starts up,
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1: Introducing C#
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resolves the location of Main, and begins executing the first statement within Listing 13
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Listing 13: Breaking Apart HelloWorld
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class HelloWorld { Method Declaration static void Main() { Main SystemConsoleWriteLine("Hello, My name is Inigo Montoya"); } Statement }
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Class Definition
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Although the Main method declaration can vary to some degree, static and the method name, Main, are always required
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ADVANCED TOPIC Declaration of the Main Method Although it is possible to declare the Main method without parameters or a return type, C# supports specifying either one Listing 14 shows the full declaration of the Main method
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Listing 14: The Main Method, with Parameters and a Return
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static int Main(string[] args) { }
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The args parameter is an array of strings corresponding to the command-line parameters However, the first element of the array is not the program name but the first command-line parameter to appear after the executable name, unlike in C and C++ To retrieve the full command used to execute the program, use SystemEnvironmentCommandLine The int return from Main is the status code and indicates the success of the program s execution A return of a nonzero value generally indicates an error
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C# Syntax Fundamentals
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Language Contrast: C++/Java main() Is All Lowercase
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Unlike its C-style predecessors, C# uses an uppercase M for the Main method in order to be consistent with the Pascal-based naming conventions of C#
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The designation of the Main method as static indicates that other methods may call it directly off the class definition Without the static designation, the command console that started the program would need to perform additional work (known as instantiation) before calling the method ( 5 contains an entire section devoted to the topic of static members) Placing void prior to Main() indicates that this method does not return any data (explained further in 2) One distinctive C/C++ style characteristic followed by C# is the use of curly braces for the body of a construct, such as the class or the method For example, the Main method contains curly braces that surround its implementation; in this case, only one statement appears in the method
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Statements and Statement Delimiters The Main method includes a single statement, SystemConsoleWriteLine(), which is used to write a line of text to the console C# generally uses a semicolon to indicate the end of a statement, where a statement comprises one or more actions that the code will perform Declaring a variable, controlling the program flow, and calling a method are examples of statements