I test the exceptions interception, so, I don't need that Visual Studio breaks on thinkgs like thrown new NullReferenceException("myVar").
I have the following under Debug=>Exceptions
however, VS breaks on the exceptions. What should I do?
PS.
for the application unhandled exception, I "catch" them using the Application.UnhandledException as in the the following:
''' <summary>Occurs when the application encounters an unhandled exception.</summary> '
Private Sub Application_UnhandledException(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.UnhandledExceptionEventArgs) Handles Me.UnhandledException
Dim message As String = String.Format("An application UnhandledException were thrown.{1}The application will now terminate.{1}'{0}'{1}{1}StackTrace:{1}{2}", e.Exception.Message, Environment.NewLine, e.Exception.StackTrace)
MessageBox.Show(message)
End Sub
I had same problem when I started using VS2010. I have unit tests, which expect exceptions, and I throw exceptions from my functions. These exceptions are supposed to be handled by the user of my library. In Debug->Exceptions dialog, I unchecked check box under User-Unhandled column for Common Language Runtime Exceptions, and VS stopped breaking on these exceptions. By the way, I don't see second column in the dialog you attached here.
If you throw an exception that is not handled anywhere in your code, Visual Studio is going to break. It doesn't have any other choice: there was an unhandled exception. Outside of Visual Studio, the application would show an error message and inform the user that an unhandled exception occurred.
The options you see in the Debug -> Exceptions dialog only allow you to configure whether Visual Studio breaks on all exceptions, including those that are later handled in your code. These are often referred to as "first-chance" exceptions.
Beyond that, you should never throw a NullReferenceException yourself; this is a runtime exception that is reserved for the runtime framework. Instead, you should throw an ArgumentNullException.
The below method works for me in Visual Studio 2015 (a similar process may work for VS2010).
Taken from the Visual Studio documentation on managing exceptions with the debugger:
In the Exception Settings window, open the context menu by right-clicking in window and then selecting Show Columns. (If you have turned off Just My Code, you will not see this command.)
You should see a second column named Additional Actions. This column displays Continue when unhandled by user code on specific exceptions, meaning that the debugger does not break if that exception is not handled in user code but is handled in external code.
You can change this setting either for a particular exception (select the exception, right-click, and select/deselect Continue when Unhandled in User Code) or for an entire category of exceptions (for example, all the Common Language Runtime exceptions).
Related
Microsoft Visual Studio Enterprise 2019
Version 16.5.5
VisualStudio.16.Release/16.5.5+30104.148
Microsoft .NET Framework
Version 4.8.03752
I don't want visual studio to break in debug mode when such as below exceptions happened. The ones that i have handled via try catch. But i could not find a way even though I did extensive internet search
project details : asp.net web forms, .net 4.8 framework
How to not break when user handled exception is thrown in visual
studio 2019
First, thanks to Jazimov for sharing the wonderful suggestion.
Actually, to stop breaking the specific exception(System.NullReferenceException) during Debug mode, you should try Jazimpv's suggestion.
Debug-->Windows-->Exception Settings-->Common Language Runtime Exceptions
uncheck System.Null.ReferenceException
This feature simply prevents exceptions from interrupting debugging, but does not block the occurrence of exceptions. Although it does not appear in the Code Editor, it will also be caught by the output window.
However, you can't get the most straightforward exception directly in the code editor without interrupting the debugging mode.
In order to get more detailed exception information, you can write this to show on Output Window:
try
{
.........
}
catch(Exception ex)
{
Debug.WriteLine("=============================");
Debug.WriteLine(ex.Message);
Debug.WriteLine(ex.Source);
Debug.WriteLine(ex.StackTrace);
Debug.WriteLine("=============================");
}
I had a similar issue and found the fix here: Tell the debugger to continue on user-unhandled exceptions
Basically, in Exception Settings > Addition Actions column on Common Language Runtime Exceptions row, I right clicked and selected "Continue when unhandled in user code". i didn't see it break since.
You should be able to uncheck the checkbox next to "Break when this exception type is thrown" and that particular exception--when thrown--no longer should cause Visual Studio to break. Checking this checkbox does not generically prevent exceptions: You are preventing the debugger from breaking when this specific kind of exception is thrown. Notice that you also can restrict whether the debugger breaks for the particular exception to particular assemblies by checking boxes under the "Except when thrown" heading in the dialog you cited.
To view which exceptions are thrown by the debugger, go to Visual Studio's Debug | Windows | Exception Settings menu and expand the Common Language Runtime Exceptions branch:
I just came across odd behavior with exception handling in .Net. (I'm using C# in MS Visual Studio 2008, but one question I saw here seemed to imply that what I see is true throughout the .Net world.) I am writing a plain WinForm application. I am intentionally causing an unhandled exception to be thrown inside a form_load event handler, outside of any try block. I get no notification. If an unhandled exception occurs in a normal method, a message pops up telling me that the exception happened, and giving me some information about the problem. But in the handler, the code just quietly exits the function without letting anybody know that it happened. If I add a try/catch block, the exception is caught as expected.
Is it true that this behavior happens in all event handlers? And is this expected behavior? And if so, is it because there is too much danger of bad things happening if an event handler unexpectedly stops?
Whether inside or outside VS, this behavior occurs when there is a debugger attached to the process. However, being a debug version makes no difference. If running outside VS without a debugger attached, the unhandled exception will fire up.
You can check
Why the form load can't catch exception? , and
VS2010 does not show unhandled exception message in a WinForms Application on a 64-bit version of Windows , for possible solutions.
EDIT: This behavior is only specific to the form_load event handler, as far as I know.
On my other machines, Visual Studio always broke on errors when there was not a try/catch to handle them, but if there was a try/catch then it didn't break.
For some reason, on this laptop, it doesn't work that way. It didn't break at all at first, but then I found out how to set it to break by going to debug/exceptions. However, configuring it to break there causes it to always break on exceptions even if there is a try/catch block.
How do I make it work like I'm used to?
Make sure you have Just My Code Enabled by going into Tools-->Options-->Debugger-->General--> Enable Just My Code. This will change your Debug--> Exceptions Dialog Box to show a CheckBox for User-unhandled Errors.
I cannot find the dialogue in the accepted answer.
In my experience, in Exception Settings, if you hit "Restore the list to default settings", it will not break on exceptions you handled. If you checked a particular exception in Exception Settings, then it will break regardless of whether you handles this exception in your code or not.
For a more updated answer:
When you go to the exception settings right click on the exception type you want, which for C# would probably be Common Language Runtime Exceptions, and enable the "Continue When Unhandled in User Code" setting.
For me this seemed to not break on exceptions that were handled in a try catch or otherwise, but it did break when an unhandled exception occurred. The naming of the option makes it feel a bit iffy but it seems to work exactly as you and I hoped now.
Exception settings
Enable the required setting
In Visual Studio 2022 in the Exception Settings (Debug > Windows > Exception Settings), there is another column (Additional Actions) that can be viewed. It is written about here in the Microsoft Docs.
Make sure to remove the "Continue when unhandled in user code" setting in order break on any given exception.
I'm working on a project where a lot of bad code is written.
Today I came across a piece of code that caught and exception and just returned an empty string to "handle" it (very difficult to debug).
I was wondering whether there was any way of knowing that an exception has been thrown and caught in visual studio 2010?
VS menu -> Debug -> Exceptions -> Enable CLR Exceptions
(CTRL+ALT+E)
There you can choose from "Thrown" or "user un-handled", obviously you need to break on "Thrown" exceptions
The debugger can break execution of your application immediately when
an exception occurs, giving you a chance to debug the exception before
a handler is invoked.
More details on MSDN: How to: Break When an Exception is Thrown
Important note - this feature is not available on Visual Studio "Web Developer" edition
Go to the 'debug' menu, select 'exceptions' and check 'Thrown' next to Common Language Runtime Exceptions. When debugging, this will break at any point an exception is thrown when debugging.
On the "Debug" menu choose "Exceptions..." and then tick "Thrown" and/or "User-Unhandled" for Common Language Runtime Exceptions.
This is not possible.
Visual Studio has settings for stopping either when unhandled exceptions occur or whenever an exception is thrown (or both).
There is no setting for exceptions that have been caught (as this would be a very common case and would overwhelm the display).
The debugger writes a entry to the output window when an exception is thrown.
http://msdn.microsoft.com/en-us/library/x85tt0dd.aspx
You can break when an exception is thrown.
You can use ReSharper to detect unused parameters (catch(Exception e))
Is there a pragma or debugger attribute which will allow the debugger to not break on the throwing of a specific exception even though under the Debug >> Exceptions menu I've told it to break when any CLR Exceptions are throw?
In general while developing I like to have it break on exceptions while debugging so that I can immediately inspect them. Sometimes there are some isolated cases where it is known that this block of code occasionally throws exceptions and I've handled it in with a try-catch. See the answer to this question where the consensus was that try-catch is the most correct situation.
I'd like to be able to set an attribute on the method (something analogous to System.Diagnostics.DebuggerHiddenAttribute) which just ignores any exceptions thrown in the method.
BTW, I'm currently experiencing this in Visual Studio 2008, but I'm guessing there is either an answer for all versions or none.
The direct answer can be found under Exceptions menu item of the Debug menu. This is a per solution/project setting. (Tools > Option > Debugging is a system-wide setting.) See the help topic Visual Studio Debugger, How to: Break When an Exception is Thrown at http://msdn.microsoft.com/en-us/library/d14azbfh.aspx for details. The Exceptions dialog allows you to set which exceptions are thrown or which exceptions break into the debugger.
I find I get more use out of the DebuggerStepThrough attribute.
In general, I leave throwing exceptions to the default (Debug > Exceptions user-unhandled checked and Thrown unchecked) and add the DebuggerStepThrough attribute for methods where I am not interested in stepping through nor am I interested in any exceptions being thrown within that method. I rarely use DebuggerHidden, and get more use with DebuggerNonUserCode in library code.