[Solved] Find the problem in this code:try { // code } catch (Exception ex) when (ex.Message == null) { Console.WriteLine("Null message"); } catch { Console.WriteLine("General catch"); } | C Sharp (C#)

C Sharp (C#) - Exception Handling

Find the problem in this code:

try {
    // code
} catch (Exception ex) when (ex.Message == null) {
    Console.WriteLine("Null message");
} catch {
    Console.WriteLine("General catch");
}

AThe try block is empty

BThe when clause can cause a NullReferenceException

CCannot use Console.WriteLine in catch blocks

DThe catch without exception type is invalid after a catch with when

Step-by-Step Solution

Solution:

Step 1: Analyze the when condition
The condition ex.Message == null accesses ex.Message, which is never null but could be empty. However, if ex was null (which it cannot be), it would cause an error.
Step 2: Consider possible runtime issues
In this case, ex.Message is safe, but if the condition was more complex and accessed properties without null checks, it could cause NullReferenceException.
Final Answer:
The when clause can cause a NullReferenceException -> Option B
Quick Check:
when condition can throw exceptions if not careful [OK]

Quick Trick: Ensure when condition is safe and null-checked [OK]

Common Mistakes:

MISTAKES

Assuming when condition never throws
Thinking catch without type is invalid here
Believing Console.WriteLine is disallowed

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More C Sharp (C#) Quizzes

Find the problem in this code:

Step 1: Analyze the when condition

Step 2: Consider possible runtime issues

Final Answer:

Quick Check:

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