C#.NET — Is it possible to explicitly invoke the Garbage Collector (GC)?

Difficulty: Easy

Correct Answer: Yes

Explanation:


Introduction / Context:
The .NET runtime manages memory automatically via a garbage collector. Developers sometimes wonder whether they can force a collection for testing or diagnostics, and what the implications are.



Given Data / Assumptions:

  • We are considering explicit APIs versus automatic behavior.
  • We focus on what is possible, not necessarily recommended.


Concept / Approach:
.NET exposes APIs such as GC.Collect(), GC.GetTotalMemory(...), and GC.WaitForPendingFinalizers(). Calling GC.Collect() requests that the runtime perform a collection across generations, though the GC retains ultimate control. Explicit collection is generally discouraged in production because it can hurt performance and disrupt generational heuristics.



Step-by-Step Solution:

1) Recognize that GC.Collect() exists and is callable.2) Understand that it is a request; timing and exact impact are runtime-managed.3) Prefer letting the GC run automatically unless you have a measured scenario (e.g., large object graph release before going idle).


Verification / Alternative check:
Create a small test harness, allocate objects, call GC.Collect(), and observe memory/free lists via diagnostic tools.



Why Other Options Are Wrong:

  • No: Incorrect — the API is present and callable.


Common Pitfalls:
Misusing explicit collections can increase pause times and degrade throughput; rely on profiling before forcing collections.



Final Answer:
Yes

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