C#.NET — During the lifetime of a single object, how many times can its constructor run?
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AAs many times as we call it.
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BOnly once.
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CDepends on a Visual Studio project setting.
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DAny number of times before the object is garbage collected.
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EAny number of times before the object is deleted.
Answer
Correct Answer: Only once.
Explanation
Introduction / Context:A constructor initializes a new object immediately after memory is allocated. The semantics guarantee predictable, one-time setup for that instance.
Given Data / Assumptions:
- An object is created with
new, which allocates memory and then calls the constructor. - We are talking about one specific instance's lifetime.
Concept / Approach:The constructor executes exactly once per instance, at construction time. You cannot re-run the constructor on an already created object. Re-initialization requires a separate method or creating a new instance.
Step-by-Step Solution:
Allocation → constructor runs exactly once → object becomes usable.There is no supported way to re-invoke the constructor on the same instance.Verification / Alternative check:Experiment by trying to call the constructor like an ordinary method on an existing instance; this is not allowed.
Why Other Options Are Wrong:
- A/D/E: Misunderstand life-cycle; constructor is not a repeatable routine on the same object.
- C: No such project setting changes constructor semantics.
Common Pitfalls:Assuming a constructor can serve as a reset method; write an explicit Reset() if needed.
Final Answer:Only once.