C # collection series (3): Constructor

 

1. Demonstrate the inheritance of Constructors

• Declare an empty constructor to Prevent Automatic Generation of default constructor.
• If you do not use an access modifier for the constructor, it is still a private constructor by default.
• The private modifier is explicitly used to explicitly indicate that the class cannot be instantiated.

 

2. Static Constructor

• Static constructors have the following features:
• The static constructor neither has an access modifier nor a parameter.
• Before creating the first instance or referencing any static member, the class is automatically initialized by calling the static constructor.
• Static constructor cannot be called directly.
• InProgramThe user cannot control when to execute the static constructor.
• A typical use of a static constructor is to use this constructor to write entries to a log file when the class uses a log file.
• Static constructors are not hostedCodeIt is also useful when creating a packaging class.

3. Example:

 

UsingSystem;

UsingSystem. Collections. Generic;

UsingSystem. LINQ;

UsingSystem. text;

 

// Description: test the constructor.

 

NamespaceNettest

{

Public Class Father

{

 

PublicFather ()

{

Console. Out. writeline ("Father say");

}

Public static father ()

{}

*/

 

PublicFather (StringS)

{

Console. Out. writeline (S +": Father say");

}

}

 

Public Class Son:Father

{

/*

// Call the class constructor of the parent constructor without Parameters

Public son ()

{

Console. Out. writeline ("son say ");

}

*/

PublicSon (StringS)

{

Console. Out. writeline ("Good son say :");

}

 

/* Base display calls to the parent class Constructor

Public son ()

: Base ("Jack ")

{

Console. Out. writeline ("son say ");

}

*/

 

/* The subclass implicitly calls the non-argument constructor of the parent class */

/* This calls its own overloaded constructor */

PublicSon ()

:This("Call myself another constructor")

{

Console. Out. writeline ("Above sentence calling myself");

}

}

 

Public Class Testconstructor

{

 

Public VoidTest ()

{

New Son();

}

}

}