[Solved] Which of the following shows the correct way to write a catch block with a when clause in C#? - Ans: catch (Exception ex) when (ex.Message == "Error") { /* handle */ } | C Sharp (C#)

C Sharp (C#) - Exception Handling

Which of the following shows the correct way to write a catch block with a when clause in C#?

Acatch (Exception ex) where (ex.Message == "Error") { /* handle */ }

Bcatch (Exception ex) when (ex.Message == "Error") { /* handle */ }

Ccatch (Exception ex) if (ex.Message == "Error") { /* handle */ }

Dcatch (Exception ex) filter (ex.Message == "Error") { /* handle */ }

Step-by-Step Solution

Solution:

Step 1: Recall correct syntax
The when keyword is used with parentheses for the condition.
Step 2: Evaluate options
catch (Exception ex) when (ex.Message == "Error") { /* handle */ } uses correct syntax: catch (Exception ex) when (condition). Options B, C, and D use invalid keywords.
Final Answer:
catch (Exception ex) when (ex.Message == "Error") { /* handle */ } -> Option B
Quick Check:
Only when is valid for conditional catch filters [OK]

Quick Trick: Use 'when' keyword with parentheses in catch [OK]

Common Mistakes:

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Which of the following shows the correct way to write a catch block with a when clause in C#?