[Solved] Identify the error in this code:class Base { public virtual void Run() { } } class Derived : Base { public sealed override void Run() { } } class MoreDerived :... | C Sharp (C#)

C Sharp (C#) - Inheritance

Identify the error in this code:

class Base {
    public virtual void Run() { }
}
class Derived : Base {
    public sealed override void Run() { }
}
class MoreDerived : Derived {
    public sealed override void Run() { }
}

ADerived must not override Run as sealed.

BMoreDerived cannot seal an already sealed method.

CBase class method must be sealed first.

DNo error; code is valid.

Step-by-Step Solution

Solution:

Step 1: Check sealing rules on overrides
Once a method is sealed in Derived, it cannot be overridden or sealed again in MoreDerived.
Step 2: Identify error location
MoreDerived tries to override and seal Run, causing a compilation error.
Final Answer:
MoreDerived cannot seal an already sealed method. -> Option B
Quick Check:
Sealed override cannot be overridden again [OK]

Quick Trick: Sealed methods cannot be overridden or sealed again [OK]

Common Mistakes:

MISTAKES

Thinking sealing twice is allowed
Believing base method must be sealed first
Assuming no error in multiple sealing

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More C Sharp (C#) Quizzes

Identify the error in this code:

Step 1: Check sealing rules on overrides

Step 2: Identify error location

Final Answer:

Quick Check:

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