Abstract Class Vs Interface in C#.Net
| Abstract Class Vs Interface in C#.Net | ||
| Memebers Allowed | Abstract as well as non abstact allowed. | Only abstract members are Allowed. |
| Implementation of methods in derived classes | Not necessary to implement all the methods of base (abstract) class for derived classes. | The derived class must implement all the methods of interface. |
| Fields | Can be defined. | Can not be defined. |
| Access Modifier | Can contain access modifiers for the functions, properties. | Cannot have access modifiers for the functions, properties all members of interface is assumed as public. |
| Advantage of Interface over Abstract class | A class may inherit only one abstract class. | A class may inherit several interfaces. |
| Advantage of Abstract class over Interface | Abstract classes can add more functionality without destroying the child classes that were using the old version. | In an interface, creation of additional functions will have an effect on its child classes, due to the necessary implementation of interface methods to classes. |
Now explanation of above points as below,
Members Allowed & Fields
Abstract class with abstract as well as non-abstract members as below,
Abstract Class Vs Interface in C#.Net
Interface allows only abstract members (i.e. methods with declaration only not implementation) as below,
Abstract Class Vs Interface in C#.Net
Access Modifier and Implementation of methods in derived classes
