try catch in C#

jojoba2011

How can i get : the value or Parameter that cause error in try block? Simple example : try { int i=0; int j=2; int k=j/i; } catch(Exception e) { messagebox.show(e.Message); } now i wanna to have these : in line 5 the exception occurred and i=0 made the exception;

Nematjon Rahmanov

you mean ,

try
{
int i=0;
int j=2;
if(i==0)
{
throw new ArgumentNullException();// or your exception class
}
int k=j/i;
}
catch(Exception e)
{
messagebox.show(e.Message);
}

We are haven't bug,just temporarily undecided problems.

Dave Kreskowiak

jojoba2011 wrote:

the value or Parameter that cause error in try block?

If you're asking what I think you are, you can't get that detailed of a message.

A guide to posting questions on CodeProject[^]
Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

jojoba2011

I exactly want this message :

line 5 exception occured
i=0 made this error

N a v a n e e t h

Stack trace will have these details. You have to parse the stack trace and extract this information.

Best wishes, Navaneeth

Lost User

Move i outside the try/catch block so it is visible in all sections, something like:

int i;
try
{
i=0;
int j=2;
int k=j/i;
}
catch(Exception e)
{
string msg = "i = " + i + " " + e.Message;
messagebox.show(msg);
}

txtspeak is the realm of 9 year old children, not developers. Christian Graus

PIEBALDconsult

i=0 didn't cause the Exception; it's j/i. You could put the three statements each in its own try/catch. You could keep track of where you were in the process:

int x;

try
{
x=0;
int i=0;

x=1;
int j=2;

x=2;
int k=j/i;

x=3;
}
catch(Exception e)
{
string err="";

switch(x)
{
case 0: err = " caused by i=0" ; break ;
case 1: err = " caused by j=2" ; break ;
case 2: err = " caused by k=j/i" ; break ;
}

messagebox.show(e.Message + err );
}

carlecomm

"i=0 made the exception" can be thrown by catch(DevideByZeroException) { } but I don't know how to throw "in line 5 the exception occurred" until now.