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,
Interface allows only abstract members (i.e. methods with declaration only not implementation) as below,
Access Modifier and Implementation of methods in derived classes
 |
| Interface implementation in Derived classes |
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| Abstract Class implementation in derived classes |
Memebers Allowed for interface only abstract members ,Update The First Item In comparison
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