Which approach is more robust?

Question

BlackTom AI · Accepted Answer

TryParse combined with explicit validation is more robust because it prevents exceptions from malformed input and enforces business rules before accepting values. 1) Relevant knowledge points and concepts - Input validation: verifying format, type, and business constraints (range, required precision). - Exception-safe parsing: TryParse-style APIs return a success flag instead of throwing on bad input. - Fail-fast and defensive programming: detect and handle invalid input immediately to avoid corrupt state or downstream errors. 2) Step-by-step reasoning process - External input can be null, empty, non-numeric, or numeric but out of allowed range. Any robust solution must handle all of these cases. - Use TryParse to attempt conversion; it returns false for non-parsable data instead of throwing an exception. This avoids costly try/catch and unexpected crashes. - If TryParse succeeds, perform validation checks (e.g., value >= min && value <= max, not NaN, cultural/format considerations). If validation fails, return a clear error or default value. - If TryParse fails, handle gracefully (log, inform user, use fallback), not ignore silently. 3) Example flow (intermediate steps) - Input: "123abc" - TryParse("123abc") -> false -> handle invalid input (show error). - Input: "500" - TryParse("500") -> true -> validate: 500 <= maxAllowed? If no -> reject with error. 4) Why the correct answer is correct TryParse + validation covers both parsing safety and semantic correctness. It prevents exceptions, handles malformed input, and ensures the parsed value meets all application rules—making it the most robust approach. 5) Why other options are incorrect - a. No validation: accepts invalid/malicious input, leading to incorrect behavior or security issues. - b. Parse only: Parse throws exceptions on bad input; relying solely on Parse is brittle and error-prone. - d. Ignore errors: Hides problems, causes silent failures and unpredictable behavior. 6) Conclusion Therefore, the most robust approach is c. TryParse + validation, which matches the provided correct answer.

Which approach is more robust?单项选择题

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