Basic _ C # general program structure

C # general program structure

C # A program may consist of one or more files. Each file can contain zero or more namespaces. In addition to other namespaces, a namespace can also contain classes, structures, interfaces, enumerations, delegates, and other types. The following is the backbone of the C # program, which contains all these elements.

 

// Reference other namespaces
Using system;
// Current namespace
Namespace yournamespace
{
// Class
Class yourclass
{
}

// Structure
Struct yourstruct
{
}

// Interface
Interface iyourinterface
{
}

// Delegate
Delegate int yourdelegate ();

// Enumeration
Enum yourenum
{
}

// Subnamespace
Namespace yournestednamespace
{
Struct yourstruct
{
}
}

// Main class
Class yourmainclass
{
// Main method
Static void main (string [] ARGs)
{
// Your program starts here
System. Console. writeline ("Hello world! ");
System. Console. Readline ();
}
}
}

 

 

Main Method

C # the program must containMainMethod, and the program control starts and ends in this method. InMainCreate an object and execute other methods.

MainA method is a static method residing in a class or structure. In front of "Hello world !" In the example, it resides inYourMainClass . Declare using either of the following methodsMainMethod:

• This method returns void:
  Static void main ()
  {
  //
  }
• It can also return INT: static int main ()
  {
  //
  Return 0;
  }
• Because there are two return types, it can contain the parameter: static void main (string [] ARGs)
  {
  //
  }

  Or

  Static int main (string [] ARGs)
  {
  //
  Return 0;
  }

  MainThe method parameter isstringArray, which indicates the command line parameters used to activate the program. Note that, unlike C ++, this array does not contain executable (exe) file names.

  • The main method is the entry point of the program. The program control starts and ends in the method.

  • This method is declared inside the class or structure. It must be a static method, rather than a public method. (In the above example, it accepts the default access level private .)

  • It can have the void or Int return type.

  • When declaring the main method, either the parameter or the parameter can be used.

  • The parameter can be read as a command line parameter that starts from scratch.

  • Unlike C and C ++, the program name is not treated as the first command line parameter.

• For more information about using command line parameters, see main () and command line parameters (C # Programming Guide) and how to: create and use C # DLL (C # programming guide).

Input and Output

C # programs generally use the input/output service provided by the. NET Framework Runtime Library. StatementSystem.Console.WriteLine("Hello World!");The writeline method is used.ConsoleClass output method. It displays the string parameters used by the standard output stream, followed by a new line. Other console methods are used for different inputs.Console. Readline ()And OutputConsole. writeline ("Hello world! ")Operation. If the program containsusing System;Command, you do not need to fully limit the System Classes and methods to use them directly. For example, you can callConsole.WriteLineWithout specifyingSystem.Console.Writeline: