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Questions
13 of 13
1What is an Abstract Class? When is it used?
2What is an Interface? When is it used?
3Compare Abstract Classes and Interfaces. When would you choose one over the other?
4Can an Interface have fields? Why or why not?
5Can an Interface have a Constructor?
6What are Default Methods in Interfaces (Java 8+ / C# 8+)? Why were they introduced?
7Can an Interface inherit from another Interface?
8Can an Abstract Class implement an Interface and not define all methods?
9What are Marker Interfaces (e.g., Serializable)? Are they an anti-pattern?
10How do you achieve Loose Coupling using Interfaces? (Dependency Injection basics)
11What is 'Programming to an Interface, not an Implementation'?
12Why can't you instantiate an Interface or Abstract Class?
13Explain "Explicit Interface Implementation" (C#) and when it's needed.
OOPSOOPS
Basics
Inheritance and Composition
Polymorphism
Interfaces and Abstract Classes
Access Modifiers and Scope
Advanced Concepts and Design Principles
Trees
Real-World Design and Architecture Scenarios
13 / 13

Explain "Explicit Interface Implementation" (C#) and when it's needed.

Difficulty: 4/10

Explicit Interface Implementation in C#

Explicit interface implementation in C# allows a class to implement an interface member so that the member is accessible through the interface reference rather than directly through the class instance. It is particularly useful when two interfaces define members with the same signature but require different behavior, or when an interface member should not form part of the class's normal public API. This provides precise control over interface-specific behavior and avoids naming conflicts.

javascript
  1. 1

    Used when multiple interfaces contain conflicting member signatures.

  2. 2

    Allows different implementations for the same interface member name.

  3. 3

    The explicitly implemented member is normally accessed through the interface reference.

  4. 4

    Keeps interface-specific behavior out of the class's ordinary public surface.

  5. 5

    Useful for API compatibility when implementing multiple contracts.

  6. 6

    Should be used intentionally because it can make members less discoverable to callers holding the concrete type.

Follow-up Questions

  • What is implicit interface implementation in C#?
  • Why would explicit implementation hide a member from the concrete class API?
  • Can explicit interface implementations be public?
  • How do you resolve two interfaces with the same method name?
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