- Interfaces are closely related to abstract classes that have all members abstract.
- For an abstract class, at least one method of the class must be an abstract method that means it may have concrete methods.
- For an interface, all the methods must be abstract
- Class that implements an interface much provide concrete implementation of all the methods definition in an interface or else must be declare an abstract class
- In C#, multiple inheritance is possible only through implementation of multiple interfaces. Abstract class can only be derived once.
- An interface defines a contract and can only contains four entities viz methods, properties, events and indexes. An interface thus cannot contain constants, fields, operators, constructors, destructors, static constructors, or types.
- Also an interface cannot contain static members of any kind. The modifiers abstract, public, protected, internal, private, virtual, override is disallowed, as they make no sense in this context.
- Class members that implement the interface members must be publicly accessible.
By Milan Saxena
Difference between Interface and Abstract Class
Category:
C#,
OOPS
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