Try-Catch unknown behaviour

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Hi, my name is Alex.
I'm currently learning after a book about how to convert xaml code into objects during runtime.

I have the following code:

C#

try
           {
               ctrl = XamlReader.Load(xaml) as UserControl;
           }
           catch (Exception exc)
           {
               OnXamlResult(new XamlCruncherEventArgs(exc.Message)); return;
           }

The code is not mine, I took it from the book.

The problem is that try-catch does not work properly, or at least as I know till now.
During debugging the program stops when it reaches the line :

ctrl = XamlReader.Load(xaml) as UserControl;

without catching the exception.

What am I doing wrong or how can I solve this problem?

Thanks in advance!

Sorry for missing some things.
xaml is a string. It is taken form a textbox and if the xaml is correctly typed by the user the program should convert the xaml code into object otherwise it should display the corresponding error.

About how the program reacts, i can say that debug stops and it is not behaving like going into a infinite cycle.

Posted 19-Aug-11 1:53am

Andu92

Updated 19-Aug-11 2:31am

v2

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#realJSOP · Answer 1 · 2011-08-19T02:06:00

Solution 1

0) We don't know what the xaml variable represents. Show us how it was initialized.

1) If your xaml (XmlReader) parameter isn't null, you won't get an exception.

Posted 19-Aug-11 2:06am

#realJSOP

Comments

Anil Honey 206 19-Aug-11 8:24am

Its Correct.

CPallini · Answer 2 · 2011-08-19T02:11:00

Solution 2

What do you mean with 'program stops'? Does it really stop?
If the program just hangs then it has nothing to do with the try/catch block: probably the Load operation causes it (without throwing).

Posted 19-Aug-11 2:11am

CPallini

Anil Honey 206 · Answer 3 · 2011-08-19T02:26:00

Solution 3

With Out Any Error Try Catch Block Will Not Catch the Expection.In your Code there is No Error.

Posted 19-Aug-11 2:26am

Anil Honey 206

Oludayo Alli · Answer 4 · 2011-08-19T05:42:00

Solution 4

I will suggest that you set a break point to see if

ctrl = XamlReader.Load(xaml) as UserControl;

really perform its function. With this I think you can see if there is any exception to catch and if the try-catch block is/is not performing its function.

Posted 19-Aug-11 5:42am

Oludayo Alli

Updated 19-Aug-11 5:50am

v2

VallarasuS · Answer 5 · 2011-08-19T06:00:00

You have to check the parameter, have nothing else to do with the code, and as the documentation reads the 'xaml' parameter should be a stream containing the actual xaml.

http://msdn.microsoft.com/en-us/library/ms590398.aspx

for your code to work save the xaml string in a file, then read the contents or the text to a stream then pass it on to Load(), may be you should check with a different xaml file for testing!

Regards
Vallarasu S.