What is the use of Base keyword

pawan kumar

13y4.1kVisual Basic .NET

hi friends please tell me the use of Base keyword

4 Replies

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Jignesh Trivedi13y ago
hi,
The "base" keyword is used to access members of the base class from the derived class in c#.
please refer
http://msdn.microsoft.com/en-us/library/hfw7t1ce(v=vs.71).aspx
hope this will help you.
13y ago
See this wbsite

http://www.dotnetperls.com/base
Vulpes13y ago
The base keyword has two uses:

1. To call a base class constructor from a derived class constructor.

2. To call a base class method which is overridden in the derived class.

This simple program illustrates both uses:

using System;

class Parent
{
string message;

public virtual void MyMethod()
{
Console.WriteLine(message);
}

public Parent (string message)
{
this.message = message;
}
}

class Child : Parent
{
public override void MyMethod()
{
Console.WriteLine("Hello from child class");
}

public void YourMethod()
{
base.MyMethod();
}

public Child (string message) : base (message)
{
}
}

class Test
{
static void Main()
{
Child c = new Child("Hello from base class");
c.MyMethod();
c.YourMethod();
Console.ReadKey();
}
}

The output is:

Hello from child class
Hello from base class
Sanjeeb Lenka13y ago
C# base keyword is used to call the base class constructor and base class field.
First the values are received by the derived class constructor and then passed to the base class constructor.

See The Code class A
{
int i;
A(int n, int m)
{
x = n;
y = m
Console.WriteLine("n="+x+"m="+y);
}
}
class B:A
{
int i;
B(int a, int b):base(a,b)//calling base class constructor and passing value
{
base.i = a;//passing value to base class field
i = b;
}
public void Show()
{
Console.WriteLine("Derived class i="+i);
Console.WriteLine("Base class i="+base.i);
}
}
class MainClass
{
static void Main(string args[])
{
B b=new B(7,8);//passing value to derive class constructor
b.Show();
}
}

OUTPUT

n=7 m= 8
Derived class i=8
Base class i=7