C# Discussion Boards - CodeProject

Re: Silly Qustion About try catch finally blocks!!!!!

10-Aug-08 22:47

mrcooll wrote:
can i handle an exception without using try catch blocks,

Yes, there's an event that gets fired at the top level of an app if an uncaught exception hits that level. But, that's not really a great way to handle exceptions, because it's so far from the source, that it's hard to recover.

Christian Graus

No longer a Microsoft MVP, but still happy to answer your questions.

mrcooll10-Aug-08 23:01

mrcooll

10-Aug-08 23:01

did u mean the

void Application_Error(object sender, EventArgs e)
{ // Code that runs when an unhandled error occurs Server.Transfer("HandleError.aspx");
}
in web application ?
becouse i dont know what r u talking about in windows app!!

Re: Silly Qustion About try catch finally blocks!!!!!

Christian Graus10-Aug-08 23:02

Re: Silly Qustion About try catch finally blocks!!!!!

10-Aug-08 23:02

No, there's an event in a windows app. I forget the details, but I know I implemented it in my windows app for any uncaught exceptions.

Christian Graus

No longer a Microsoft MVP, but still happy to answer your questions.

Manas Bhardwaj10-Aug-08 23:22

Manas Bhardwaj

10-Aug-08 23:22

In windows application you can hook up to AppDomain.UnhandledException and Application.ThreadException events.
Using this any handled exception can be handled centrally. Rose | [Rose]

Re: Silly Qustion About try catch finally blocks!!!!!

Simon P Stevens10-Aug-08 23:24

Simon P Stevens

10-Aug-08 23:24

Beat me to it.

Simon

Re: Silly Qustion About try catch finally blocks!!!!!

Manas Bhardwaj10-Aug-08 23:40

Manas Bhardwaj

10-Aug-08 23:40

Re: Silly Qustion About try catch finally blocks!!!!!

Christian Graus10-Aug-08 23:47

Re: Silly Qustion About try catch finally blocks!!!!!

10-Aug-08 23:47

Cool - two people who could be bothered to look it up Smile | :)

Christian Graus

No longer a Microsoft MVP, but still happy to answer your questions.

Simon P Stevens10-Aug-08 23:23

Simon P Stevens

10-Aug-08 23:23

Application.ThreadException or AppDomain.UnhandledException

http://www.codeproject.com/KB/dotnet/unhandledexceptions.aspx[^]

Simon

Re: Silly Qustion About try catch finally blocks!!!!!

Zoltan Balazs10-Aug-08 23:21

Zoltan Balazs

10-Aug-08 23:21

Look up AppDomain.UnhandledException event.

Work @ Network integrated solutions | Flickr | A practical use of the MVC pattern

Re: Silly Qustion About try catch finally blocks!!!!!

bhadeliaimran10-Aug-08 23:22

bhadeliaimran

10-Aug-08 23:22

yes you can do it at Page level as well as Applcation level with out using try catch.
@PAge: protected override void OnError(EventArgs e)
@Application level: void Application_Error(object sender, EventArgs e)

Imran
[MCTS]
Few have audacity to speak truth

Re: Silly Qustion About try catch finally blocks!!!!!

mrcooll11-Aug-08 1:16

mrcooll

11-Aug-08 1:16

Thanks for all....
that was helpfull Tips
Big Grin | :-D

Re: Silly Qustion About try catch finally blocks!!!!!

Mark Salsbery11-Aug-08 6:42

Mark Salsbery

11-Aug-08 6:42

Don't use up all the smilies! Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Interaction between Requirements and Features

Tomerland10-Aug-08 22:27

Re: Interaction between Requirements and Features

10-Aug-08 22:27

Dear readers,

I'm confused about the interaction between the terms "requirements" and "features".

I read a lot about that but I didn't really get the point.

There are a lot of statements, as:

1.
A feature is built from a group of requirements

2.
Traceability (between requirments and implementation) is possible only for features and not for requirements.

...and a lot more...

Can somebody provide me some information?

Thank's ! !

Christian Graus10-Aug-08 22:48

Re: Interaction between Requirements and Features

10-Aug-08 22:48

Requirements are 'the app needs to do x'
Features are 'we added y to the app, and this deals with requirement x'

It's probably largely semantic, but I'm sure it keeps some consultants in a job.

Christian Graus

No longer a Microsoft MVP, but still happy to answer your questions.

Tomerland10-Aug-08 23:25

10-Aug-08 23:25

Thanks's for your answer,

but I still are unable to catch the point probably Smile | :)

))

As I understand you, Requirements are from the user and Features are from the implementation. Am I right?

Let me try an example:

We have 3 user requirements:
R1: Read configdata from file after startup
R2: Store configdata to file at closing

I have the following implementation (-features)
I1: Search file from directory-tree
I2: Read config-file
I3: Interpret config-file
I4: Write config-file

This means:
R1 is implemented by I1 and I2 and I3
R2 is implemented by I1 and I4.

For getting traceability now, I have to check which requirement is implemented by which feature.

Is my thinking right in some way?

With kind regards

Grammars and Parsers

Tomerland10-Aug-08 22:24

10-Aug-08 22:24

Dear experts,

may be I have a stupid question for the experts.

During my complete sw-career, if I had to parse some information from a text-file, I wrote some hand-crafted functions/classes which were full of (stringcompare, if-then-else-constructs, nested "for"-loops, ....). Finally this code was always totally unmaintainable and unreusable.

An example: Getting the include-structure of a c++ - based program can easily get complicated, because the active include-files get constrained on nested defines.

Now I read something on grammars and parsers which are used for compiler-construction. This seems to be very interesting to a lot of practical problems (not only to my include-structure-parsing-problem).

Due to my beginners level of knowhow I have some questions:

1.
Which links/books are available for beginners?

2.
Is there a way to automatically create a parser solely from a grammar?

3.
Is there any C# - Example available anywhere (e.b. at Codeproject)

Kind Regards

Simon P Stevens10-Aug-08 23:41

Simon P Stevens

10-Aug-08 23:41

Tomerland wrote:
1.
Which links/books are available for beginners?

I did a module on compilers at uni, and the text book[^] was quite useful. It's the only book I've ever read on the subject though, so I don't know how it compares. It has several chapters on grammars, parsers and syntax trees.

Tomerland wrote:

2.
Is there a way to automatically create a parser solely from a grammar?

The classic tool is Yacc[^]. It generates parsers (in C) from grammars. I'm sure if you look around there will be ports for whatever languages you use.

Check out here for some other compiler related tools.
http://dinosaur.compilertools.net/[^]
http://catalog.compilertools.net/lexparse.html[^]

There's Irony[^] for .net. It generates compilers for domain specific languages, when given a grammar. (There's also a CP article on it's use here[^]). I haven't tried this out yet, but it's been on my list of interesting things to look at for at least 6 months Laugh | :laugh:

There's also an article on a tiny parser generator[^] app posted only a few days ago.

Simon

Tomerland10-Aug-08 23:45

10-Aug-08 23:45

Thank you very much for your help,

a very nice overview

With very kind Regards Wink | ;)

c242311-Aug-08 1:04

c2423

11-Aug-08 1:04

You might like to look at COCO/R (type into Google and will be the first hit) for generating from grammars. Its my tool of choice because the syntax is easy to learn and its ported to lots of languages (i.e. it can generate C#, Java......)

Chris

Tomerland11-Aug-08 1:34