Abstract class
An abstract class is a special kind of class that cannot be instantiated. So the question is why we need a class that cannot be instantiated? An abstract class is only to be sub-classed (inherited from). In other words, it only allows other classes to inherit from it but cannot be instantiated.
The advantage is that it enforces certain hierarchies for all the subclasses. In simple words, it is a kind of contract that forces all the subclasses to carry on the same hierarchies or standards.
2. If your base functionality will be useful for a wide disparate or unrelated range of classes then create interface, because abstract classes should be created for something closely related classes.
3. If you have requirement of common, implemented base functionality then create abstract class because abstract class allow implementation also of members while in interface you can not implement any member.
If you need to have some code, data, access modifiers in functionality then use abstract class, in interface all members are public by default.
4. If you are designing small base functionality then create interface for large base functionality use abstract class.
An abstract class is a special kind of class that cannot be instantiated. So the question is why we need a class that cannot be instantiated? An abstract class is only to be sub-classed (inherited from). In other words, it only allows other classes to inherit from it but cannot be instantiated.
The advantage is that it enforces certain hierarchies for all the subclasses. In simple words, it is a kind of contract that forces all the subclasses to carry on the same hierarchies or standards.
Interface
An interface is not a class. It is an entity that is defined by the word Interface. An interface has no implementation; it only has the signature or in other words, just the declaration of methods.
As one of the similarities to Abstract class, it is a contract that is used to define hierarchies for all subclasses or it defines specific set of methods and their arguments. The main difference between them is that a class can implement more than one interface but can only inherit from one abstract class. Since C# doesn’t support multiple inheritance, interfaces are used to implement multiple inheritance.
As one of the similarities to Abstract class, it is a contract that is used to define hierarchies for all subclasses or it defines specific set of methods and their arguments. The main difference between them is that a class can implement more than one interface but can only inherit from one abstract class. Since C# doesn’t support multiple inheritance, interfaces are used to implement multiple inheritance.
Using Scenario - Abstract Class Vs Interface
1. If you want to create multiple versions of your component, means need to create some new version in future then use abstract class because you can update abstract class and all classes derived from it updated automatically. While If you need to update interface it's not allowed, you will have to create whole new interface.
1. If you want to create multiple versions of your component, means need to create some new version in future then use abstract class because you can update abstract class and all classes derived from it updated automatically. While If you need to update interface it's not allowed, you will have to create whole new interface.
2. If your base functionality will be useful for a wide disparate or unrelated range of classes then create interface, because abstract classes should be created for something closely related classes.
3. If you have requirement of common, implemented base functionality then create abstract class because abstract class allow implementation also of members while in interface you can not implement any member.
If you need to have some code, data, access modifiers in functionality then use abstract class, in interface all members are public by default.
4. If you are designing small base functionality then create interface for large base functionality use abstract class.
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