CAN interface have extension methods?
You can use extension methods to extend a class or interface, but not to override them. An extension method with the same name and signature as an interface or class method will never be called.
How do you extend a method in C#?
In C#, the extension method concept allows you to add new methods in the existing class or in the structure without modifying the source code of the original type and you do not require any kind of special permission from the original type and there is no need to re-compile the original type.
Can we define methods in interface C#?
In C#, an interface can be defined using the interface keyword. An interface can contain declarations of methods, properties, indexers, and events. However, it cannot contain fields, auto-implemented properties.
CAN interface have implementation in C#?
According to the C# Programming Guide, an interface cannot contain an implementation: When a class or struct implements an interface, the class or struct must provide an implementation for all of the members that the interface defines. The fact is, interfaces can have implementations in C# today.
Can we extend sealed class in C#?
Sealed classes are used to restrict the users from inheriting the class. A class can be sealed by using the sealed keyword. The keyword tells the compiler that the class is sealed, and therefore, cannot be extended.
What are extensions in C#?
Extension Methods are a new feature in C# 3.0. An Extension Method enables us to add methods to existing types without creating a new derived type, recompiling, or modify the original types. We can say that it extends the functionality of an existing type in . NET.
What is extension C#?
Files with . cs extension are source code files for C# programming language. Introduced by Microsoft for use with the . NET Framework, the file format provides the low-level programming language for writing code that is compiled to generate the final output file in the form of EXE or a DLL.
Can an interface extend another interface C#?
C# allows the user to inherit one interface into another interface. When a class implements the inherited interface then it must provide the implementation of all the members that are defined within the interface inheritance chain.
CAN interface have virtual methods in C#?
Yes, you can have virtual interface members in C# 8. Any interface member whose declaration includes a body is a virtual member unless the sealed or private modifier is used. So by default, all the default interface methods are virtual unless the sealed or private modifier is used.