Simple examples of C # abstract classes and interfaces

1. Personality is more than common.

2. Different personalities have some of the same behavior.

3. There is a greater difference in the way the same behavior is implemented.

Give you three objects, carp, carp, goldfish, and still let you design the base class to summarize the relationship between them, then you first realize that they are all fish, followed by their way of swimming may be slightly different, then should use the abstract base class instead of the interface, compared with the above example, for three reasons:

 interface iswim
 {     
 void Swim (); 
 } 
Public   class Person:iswim  
{  public void Swim ()
{ //swimming in person ' s style.
}
}
public class Frog:iswim
{public void Swim ()
{  //swimming in frog ' s style.
}
}
public class Fish:iswim
{public void Swim ()
{
   // swimming in fish ' s style.
}
}  

1. Generality is greater than individuality 2. Individuals with the same characteristics must have the same attribute and behavior 3. There are certain differences in the way the same behavior is implemented

Abstract  Public classFish {Abstract  Public voidSwim (); }      Public classCrucian Carp: Fish { Public Override voidSwim () {//Swim like a crucian carp }   }       Public classCarp: Fish { Public Override voidSwim () {//Swim like a carp  }    }    Public classGoldfish: Fish { Public Override voidSwim () {//Swim like a goldfish }   }    

The third reason for observing the use of interfaces or the use of abstract base classes is the same, which describes the concept of multi-state in an object-oriented way, which is implemented by overriding the parent class, and invoking the corresponding method at run time based on the object reference being passed. The second reason begins to diverge, and the interface emphasizes the same behavior among the inherited objects, while the abstract class also emphasizes the same attributes among the inherited objects.      and the actual interface and the abstract base class is the reason one, summed up as follows: When the difference between the larger objects to seek functional commonality, the use of interfaces. Use abstract base classes when looking for functional differences among more common objects.

Simple examples of C # abstract classes and interfaces