Catch All Exceptions for Console Based Program

  • Thread starter Thread starter Simon Johnson
  • Start date Start date
S

Simon Johnson

Recently, a thread appeared which asked how to create a "catch all" method
for when
an exception occurs within a program. The solution given only works for
Windows Forms applications, as far as i can tell, is it possible to do the
same with a console application?

Simon.
 
put all code in Main() inside a try/catch(/finally) block.
Main is where your program starts and any exception not caught elsewhere
in your code will end up in main before your program crashes.
 
Morten,

That's not completely true. You can have multiple threads in a console
application, and if an exception is thrown on one of those threads, then you
will not catch it by wrapping the code in a try/catch block. Take for
example the following code:

static void Main(string[] args)
{
try
{
// Create a thread.
Thread pobjThread = new Thread(new ThreadStart(DoSomething));

// Start the thread.
pobjThread.Start();

// Wait five seconds.
Thread.Sleep(5000);
}
catch (Exception e)
{
Console.WriteLine("Exception on Main thread:")
Console.WriteLine(e);
}

// Get out.
return;
}

private static void DoSomething()
{
// Throw an exception.
throw new Exception();
}

This will crash and not be caught by the catch block.

Rather, you need to attach to the UnhandledException event on the
current AppDomain, like this:

static void Main(string[] args)
{
// Wire up an event handler for unhandled exceptions.
AppDomain.CurrentDomain.UnhandledException += new
UnhandledExceptionEventHandler(UnhandledException);

try
{
// Create a thread.
Thread pobjThread = new Thread(new ThreadStart(DoSomething));

// Start the thread.
pobjThread.Start();

// Wait five seconds.
Thread.Sleep(5000);
}
catch (Exception e)
{
Console.WriteLine(e);
}

// Get out.
return;
}

private static void UnhandledException(object sender,
UnhandledExceptionEventArgs e)
{
// Write the exception.
Console.WriteLine("AppDomain Unhandled Exception Event Handler:");
Console.WriteLine(e.ExceptionObject);
}

private static void DoSomething()
{
// Throw an exception.
throw new Exception();
}
}

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

put all code in Main() inside a try/catch(/finally) block.
Main is where your program starts and any exception not caught elsewhere
in your code will end up in main before your program crashes.
 
-----Original Message-----
Recently, a thread appeared which asked how to create a "catch all" method
for when
an exception occurs within a program. The solution given only works for
Windows Forms applications, as far as i can tell, is it possible to do the
same with a console application?

Simon.


.
Click to expand...

Vectored Exception Handling is a new exception mechanism
introduced in windows XP that allows you to catch
exceptions in a "Thread Independent" manner. See:

http://msdn.microsoft.com/msdnmag/issues/01/09/hood/default
..aspx
for more information. You can also add your own "backstop"
to your application with by calling
SetUnhandledExceptionFilter on your process which will
allow you place a handler at the bottom of the exception
stack to execute when any exception propagates out far
enough. See:
http://msdn.microsoft.com/library/default.asp?
url=/library/en-
us/debug/base/setunhandledexceptionfilter.asp for more
information.

Jackson Davis [MSFT]
--

This posting is provided "AS IS" with no warranties, and
confers no rights.
Use of included script samples are subject to the terms
specified at
http://www.microsoft.com/info/cpyright.htm

Note: For the benefit of the community-at-large, all
responses to this
message are best directed to the newsgroup/thread from
which they
originated.
 
Or the simple way could be to use the AppDomain.UnhandledException event?
;-)

--
Eric Newton
C#/ASP Application Developer
http://ensoft-software.com/
(e-mail address removed)-software.com [remove the first "CC."]

Jackson Davis said:
-----Original Message-----
Recently, a thread appeared which asked how to create a "catch all" method
for when
an exception occurs within a program. The solution given only works for
Windows Forms applications, as far as i can tell, is it possible to do the
same with a console application?

Simon.


.
Click to expand...

Vectored Exception Handling is a new exception mechanism
introduced in windows XP that allows you to catch
exceptions in a "Thread Independent" manner. See:

http://msdn.microsoft.com/msdnmag/issues/01/09/hood/default
.aspx
for more information. You can also add your own "backstop"
to your application with by calling
SetUnhandledExceptionFilter on your process which will
allow you place a handler at the bottom of the exception
stack to execute when any exception propagates out far
enough. See:
http://msdn.microsoft.com/library/default.asp?
url=/library/en-
us/debug/base/setunhandledexceptionfilter.asp for more
information.

Jackson Davis [MSFT]
--

This posting is provided "AS IS" with no warranties, and
confers no rights.
Use of included script samples are subject to the terms
specified at
http://www.microsoft.com/info/cpyright.htm

Note: For the benefit of the community-at-large, all
responses to this
message are best directed to the newsgroup/thread from
which they
originated.
Click to expand...
 
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