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Exam 70-483 topic 2 question 61 discussion

Actual exam question from Microsoft's 70-483

Question #: 61
Topic #: 2

You are developing an application.
The application contains the following code:

When you compile the code, you receive the following syntax error message: "A previous catch clause already catches all exceptions of this or a super type
('System.Exception')."
You need to ensure that the code can be compiled. What should you do?

A. Catch the ArgumentException exception instead of the ArgumentNullException exception.
B. Throw a new exception in the second catch block.
C. Catch the ArgumentNullException exception first.
D. Re-throw the exception caught by the second catch block.

Show Suggested Answer

Suggested Answer: A 🗳️

by Nyxius at April 29, 2019, 9:38 p.m.

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banshee

Highly Voted 5 years, 7 months ago

The code in question is wrong. The code can have this syntax error message only when order of catch blocks is: catch(Exception e) and then catch(ArgumentNullException e). And in that case, correct answer is C (Catch the ArgumentNullException exception first).

upvoted 20 times

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andresdatacom

Highly Voted 5 years, 7 months ago

Yo creo que la pregunta esta al contrario y es como el codigo de abajo, asumiendo esto la respuesta es la A public void metodh() { try { } catch (Exception e) { throw e; } catch (ArgumentNullException e) { throw e; } }

upvoted 10 times

RaggedHagrid

4 years, 6 months ago

Si, pregunta es malo.

upvoted 1 times

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KT1978

Most Recent 4 years, 10 months ago

I think this should be Answer C and in the snippet the 2 catch blocks are the wrong way around

upvoted 2 times

noussa

4 years, 5 months ago

Indeed They gave us the solution instead of the problem :D The answer is C and the code snippet is wrong based on the exception the code is returning

upvoted 1 times

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lh2607

4 years, 11 months ago

catch(Exception e) should be the first catch block in this code for this question to be right. Then C would be the correct answer as catch(Exception e) should always be last when using multiple exception types since it is the least specific.

upvoted 1 times

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Shema

5 years, 5 months ago

So yeah, Code is OK. And 'A' can't be true bcz ArgumentNullException inherited from ArgumentException

upvoted 2 times

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AntChekalin

5 years, 7 months ago

Just try this code. Everything works fine without any changes.

upvoted 7 times

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supersunny

5 years, 11 months ago

A. is the answer. Catch the ArgumentException instead of the ArgumentNullException

upvoted 2 times

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Nyxius

6 years, 1 month ago

Question is wrong, you're probably lacking another exception catch phrase

upvoted 9 times

thiemamd

4 years, 10 months ago

I agree with you. I compiled the code but the behaviour is different than described. For the question to be correct they should reverse the order between the two exceptions

upvoted 3 times

noussa

4 years, 5 months ago

True; Exception needs to be the first catch for this to give the described exception. This is the proof: https://dotnetfiddle.net/

upvoted 2 times

noussa

4 years, 5 months ago

Sorry wrong link: https://dotnetfiddle.net/5zdHsl

upvoted 1 times

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