what is the reason behind the execution of finally block even after using return statement in try or catch block?

Question

0.00/5 (No votes)

See more:

WHY finally will execute even when there is a return in try block?

I know its by design, in finally block i should do resource cleanup - that's why the finally block is always executed no matter what the exception handling code is.

But "WHY" it will execute is my question? This was asked to my friend in an interview, so even i got confused after discussing with him, please clarify, thanks in advance.?

Posted 22-Aug-13 21:10pm

Prathap S V

Updated 22-Aug-13 21:21pm

StM0n

v3

Add a Solution

4 solutions

Solution 3

Hi, please see this thread below.

Why code in finally will execute even it has returned in try block?[^]

Posted 22-Aug-13 21:31pm

berrymaria

Solution 5

Finally is not called after return

Posted 23-Aug-13 0:33am

WaheedFeb1109

Comments

lukeer 23-Aug-13 6:49am

That's plain wrong.
See MSDN[^] on the subject.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2013-08-22T21:25:00

Because if it didn't, resources would not get cleaned up.

That's the blunt answer and it's pretty much all you need. The thing is, whenever you exit a try...finally block, by whatever means, the code in the finally block is always executed. That means if you leave because you:

1) Got to the end of the try code - execute the finally block.
2) Execute a return statement - execute the finally block.
3) Throw an exception using throw - execute the finally block.
4) Cause an exception in a called method, even if it is 100 methods deep, by making a mistake and it isn't handled by a catch anywhere - execute the finally block.
5) Use catch to handle an exception: when you exit the catch block by any means - execute the finally block.

The whole idea is that you code will never continue past the try...finally without executing the code in the finally block and releasing the resources you allocated.

Jitendra Sabat · Accepted Answer · 2013-08-22T21:40:00

Finally block will execute anyway at any circumstance.Finally block is having very important role in real time scenario.
Suppose for example you have an open database connection during execution of certain code block.During execution an error raised,which interrupted your normal flow of execution.Now control will go inside Try block which in turn will throw respective error to catch block.Note here that error is handled,but your connection to database is still open.As database is open for certain user,no other user will be able to do transaction at that time.So you should open your connection as late as possible and should close connection as early as possible.To ensure closing of connection at any circumstance provide your database close connection command inside finally block to ensure closing of open connection.So finally block is very important.

what is the reason behind the execution of finally block even after using return statement in try or catch block?

4 solutions

Solution 1

Solution 3

Solution 4

Solution 5

Add your solution here

Preview 0