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Friday, June 24, 2011

Abstract Class in c#.net

Abstract Class:
Now we will discuss about abstract class in c#.net.
·         Abstract class is class we cannot create object. We only use inherit
·         We are only use base class. If u r use abstract method u must implement derived class
Abstract Class Declaration
abstract class devenvexe
{
}
A abstract class can contain  abstract method or non-abstract method .abstract method not have implementation in abstract class .but same its have derived class
Abstract Method/Non Abstract Method:
abstract class devenvexe
{ 
public abstract void abstractMethod();
public void NonAbstractMethod()
    {
        Console.WriteLine("NonAbstract Method");
    }

}
Rules:
·         Abstract class not have sealed class
·         Abstract class only contain abstract method
·         Abstract class cannot be private
·         Abstract method cant have virtual keyword.because its  explicit virtuval method
·         Abstract class cannot be static
Performance
In our testing, abstract classes with virtual methods have better performance than interface implementation .
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