[Solved] Which of the following is the correct syntax to declare a default interface method in C#? - Ans: void Show() => Console.WriteLine("Hello"); | C Sharp (C#)

C Sharp (C#) - Interfaces

Which of the following is the correct syntax to declare a default interface method in C#?

Aabstract void Show() { Console.WriteLine("Hello"); }

Bvoid Show();

Cdefault void Show() { Console.WriteLine("Hello"); }

Dvoid Show() => Console.WriteLine("Hello");

Step-by-Step Solution

Solution:

Step 1: Recall default method syntax in interfaces
Default interface methods can have bodies using either block or expression-bodied syntax.
Step 2: Identify correct syntax among options
void Show() => Console.WriteLine("Hello"); uses expression-bodied syntax correctly inside interface method declaration.
Final Answer:
void Show() => Console.WriteLine("Hello"); -> Option D
Quick Check:
Default method syntax = method with body in interface [OK]

Quick Trick: Default methods have bodies, unlike abstract declarations [OK]

Common Mistakes:

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Which of the following is the correct syntax to declare a default interface method in C#?