Gallbladder Skin Itching

Fundamentals of Programming - Virtual methods - Examples

Virtual methods - a method that in the base class is declared as virtual , while in the derived class have been covered (blocked) as override, using the same function names and parameters according to the number and type (parameter names may be different).

Example 1 - the base class level

class level

{

public virtual void Method ()

{

Console.WriteLine ("The method was called with the class level");

}}

Program 1

class Program {

static void Main (string [] args)

{

Pa. = new Level ();

pA.Metoda ();

}}

Result 1

Example 2 - a class derived from class levels PoziomB. The method has been replaced with the keyword override .

class level
{
public virtual void Method () {

Console.WriteLine ("The method was called with the class level");
;}}

PoziomB class: Level

{public override void Method () {

; Console.WriteLine ("The method was called from class PoziomB");

}}

Program 2

class Program {

static void Main (string [] args)

{

Level PoziomB pB = new ();

pB.Metoda ();

}}

Result 2

Example 3 - a class derived from class PoziomB PoziomC. An appeal to the obscured methods using the keyword base.

class level

{public virtual void Method () {

Console.WriteLine ("The method was called with the class level");

}}
PoziomB class: Level
{
public override void Method () {

Console.WriteLine ("Method has been called PoziomB class ");
    }
}
class PoziomC : PoziomB
{
    public override void Metoda()
    {
        base.Metoda();
    }
}

Program 3

class Program

{

   static void Main (string [] args) {

PoziomA PoziomC pc = new ();

pC.Metoda ();}

}

Results 3

Przykład 4 - Class wyprowadzona PoziomD z klasy Level. It is not required to override virtual methods in classes parents.

class level

{public virtual void Method () {

Console.WriteLine ( "The method was called from the class level");

}}
PoziomD class: Level

{}

Program 4

class Program {

static void Main (string [] args) {

pd = new PoziomA PoziomD ();

pD.Metoda ();}

}

Results 4

Example 5 - The level class derived from class levels. Potential error - not in the method override keyword ; method from the class level will not be called, passing as the type of base level. Only use the var keyword, or give as a base level will cause a call to the class level.

class level

{public virtual void Method () {

Console.WriteLine ("The method was called with the class level");

}}
Class Level: Level
{
public void method () {

Console.WriteLine ("The method was called with the class level");
}
}

Program 5

class Program

{

    static void Main(string[] args)

    {

        PoziomA pE = new PoziomE();

        pE.Metoda();

    }

}

Result 5