Stressed: static Constructors (C # programming guide)

A static constructor is used to initialize any
Static data, or to perform a participates action that needs has med once only. It is called automatically before the first instance is created or any static members are referenced.

 
ClassSimpleclass {// Static ConstructorStaticSimpleclass (){//...}}
 

Static constructors have the following properties:

• A static constructor does not take access modifiers or have parameters.

• A static constructor is called automatically to initialize
  Class before the first instance is created or any static members are referenced.

• A static constructor cannot be called directly.

• The user has no control on when the static constructor is executed in the program.

• A typical use of static constructors is when the class is using a log file and the constructor is used to write entries to this file.

• Static constructors are also useful when creating Wrapper Classes for unmanaged code, when the constructor can callLoadlibraryMethod.

Example

In this example, the classBusHas a static constructor and one static member,Drive (). When
Drive ()Is called, the static constructor is invoked to initialize the class.

  Public   class  bus { // static constructor:   static  bus () {system. console. writeline ( "the static constructor invoked. ") ;}< span style =" color: Blue "> Public   static   void  drive () {system. console. writeline ( "the drive method invoked. ") ;}}< span style =" color: Blue "> class  testbus { static   void  main () {bus. drive () ;}< SPAN class = "lw_collapsiblearea_title"> output 

   
  the static constructor invoked.  
 
  the drive method invoked.  
 
 Ref: 
 
 http://msdn.microsoft.com/en-us/library/k9x6w0hc (vs.80 ). aspx