Can interface be abstract in C#?
An abstract class is a way to achieve the abstraction in C#. An Abstract class is never intended to be instantiated directly….Difference between Abstract Class and Interface.
| Abstract Class | Interface |
|---|---|
| Abstract class can contain methods, fields, constants, etc. | Interface can only contains methods, properties, indexers, events. |
What is the use of abstract class and interface in C#?
The short answer: An abstract class allows you to create functionality that subclasses can implement or override. An interface only allows you to define functionality, not implement it.
Which is better interface or abstract class in C#?
An interface is better than an abstract class when multiple classes need to implement the interface. The member of the interface cannot be static. The only complete member of an abstract class can be static. C# does not support multiple inheritances; interfaces are mainly used to implement the multiple inheritances.
Can we replace interface with abstract class in C#?
No, abstract classes still have their place.
How do you achieve abstraction in C#?
In C# abstraction is achieved with the help of Abstract classes. An abstract class is declared with the help of abstract keyword. In C#, you are not allowed to create objects of the abstract class. Or in other words, you cannot use the abstract class directly with the new operator.
What is the difference between abstract and interface in C#?
In C#, an Interface provides only those public services declared in the interface, whereas an abstract class provides the public services defined in an abstract class and those members that are inherited from the abstract class’s base class.
Can interface inherit abstract class in C#?
As we all know that an interface can inherit another interface, and interface can only contain method signature. Now the class which implement interface B need to provide body of two functions. So why can’t be a interface can inherit a abstract class or a normal class.
When should I use abstract class and interface?
Abstract classes should be used primarily for objects that are closely related, whereas interfaces are best suited for providing a common functionality to unrelated classes. Interfaces are a good choice when we think that the API will not change for a while.