SqlException constraint violation
Hi there I', working on an asp.net app. Is there a way to, when catching a SqlException, to now which constraint was violated? tks ...
exception-handling
C++ catch blocks - catch exception by value or reference?
I always catch exceptions by value. e.g try{ ... } catch(CustomException e){ ... } But I came across some code that instead had catch(CustomException &e) instead. Is this a)fine b)wrong c)a grey area? ...
C# - WinForms - Exception Handling for Events
Hi all, I apologize if this is a simple question (my Google-Fu may be bad today). Imagine this WinForms application, that has this type of design: Main application -> shows one dialog -> that 1st dialog can show another dialog. Both of the dialogs have OK/Cancel buttons (data entry). I'm trying to figure out some type of global excep...
Should I throw my own ArgumentOutOfRangeException or let one bubble up from below?
I have a class that wraps List<> I have GetValue by index method: public RenderedImageInfo GetValue(int index) { list[index].LastRetrieved = DateTime.Now; return list[index]; } If the user requests an index that is out of range, this will throw an ArgumentOutOfRangeException . Should I just let this happe...
Communication between layers in an application
Hi guys! Let's assume we have the following method in the business layer. What's the best practice to tell the UI layer that something went wrong and give also the error message? Should the method return an empty String when it was OK, otherwise the error message, or should it throw another exception in the catch code wrapping the caugh...
Multiple Exception Handlers for one exception type
I am using Enterprise Library 4.1. I have created a custom exception handler called CustomHandler. This is how the configuration section looks: <exceptionHandling> <exceptionPolicies> <add name="Exception Policy"> <exceptionTypes> <add type="System.Exception, mscorlib, Version=2.0.0.0, Culture=neutral, Public...
Exception Handling in google app engine
i am raising exception using if UserId == '' and Password == '': raise Exception.MyException , "wrong userId or password" but i want print the error message on same page class MyException(Exception): def __init__(self,msg): Exception.__init__(self,msg) ...
Spring MVC Best Practice Handling Unrecoverable Exceptions In Controller
When you have a controller that does logic with services and DAO's that may throw an unrecoverable exception, what is the best practice in dealing with those method calls? Currently an app I'm working on has very lengthy try catch methods that simply err.out exception messages, this doesn't seem very robust and I think that this code sm...
ThreadAbortException (WebClient using DownloadFile to grab file from server)
Hi Everyone, Referencing my Earlier Question, regarding downloading a file from a server and handling exceptions properly. I am positive that I had this solved, then in classic programming fashion, returned days later to frustratingly find it broken :-( Updated code: private static void GoGetIt(HttpContext context) { var...
Returning Meaningful Exceptions from a WCF Project
I am pretty new to WCF in general. What little experience I have comes from using fairly simple .SVC services in ASP.NET web applications. I tried experimenting with using a WCF Project for the first time, and ran into a major show-stopper. As I’m sure most are aware, for some strange reason, in a web application in which the customErr...
Call a non static methode in a static SQLiteDatabase class
i want to display a msg to the user (msg box or Toast) when exception happend in a static SQLite Database class that i use. the problem is that i cant call a non static method in a static class , how can i handle this. this is the class private static SQLiteDatabase getDatabase(Context aContext) { and i want to add something like ...
Servlet/JSP Flow Control: Enums, Exceptions, or Something Else?
I recently inherited an application developed with bare servlets and JSPs (i.e.: no frameworks). I've been tasked with cleaning up the error-handling workflow. Currently, each <form> in the workflow submits to a servlet, and based on the result of the form submission, the servlet does one of two things: If everything is OK, the servlet...
"Randomly" occurring errors...
Hi, My website has a setup whereby when the application starts a module called SiteContent is "created". This runs a clearup function which basically deletes any irrelevant data from the database, in case any has been left in there from previously run functions. The module has instances of Manager classes - namely RangeManager, Collect...
Android: handle unexpected internet disconnect while downloading data
Hi, I have here a function that downloads data from a remote server to file. I am still not confident with my code. My question is, what if while reading the stream and saving the data to a file and suddenly I was disconnected in the internet, will these catch exceptions below can really catch that kind of incident? If not, can you sugge...
Handling Exceptions for ThreadPoolExecutor
I have the following code snippet that basically scans through the list of task that needs to be executed and each task is then given to the executor for execution. The JobExecutor intern creates another executor (for doing db stuff...reading and writing data to queue) and completes the task. JobExecutor returns a Future for the tasks ...
Java: I have try,catch and finally in a java code and I want after try or catch block finally does not execute.
I have following code public class TEST { public static void main(String arg[]){ try { System.out.println("execute try"); //what should I write hear that finally does not run. } catch (Exception e){ System.out.println(e); } finally{ System.out.println("execute finally"); } } } wh...
IncludeExceptionDetailInFaults not behaving as thought
I have this simple test project just to test the IncludeExceptionDetailInFaults behavior. public class Service1 : IService1 { public string GetData(int value) { throw new InvalidCastException("test"); return string.Format("You entered: {0}", value); } } [ServiceContract] ...
.net Attributes that handle exceptions - usage on a property accessor
Hi, well I know from my asp.net mvc experience that you can have attributes that handle exceptions (HandleErrorAttribute). As far as I can tell the Controller class has some OnException event which may be integral to this behaviour. However, I want to do something similar in my own code: dream example: public String MyProperty { ...
Exception Handling in ASP.NET MVC and Ajax - [HandleException] filter
All, I'm learning MVC and using it for a business app (MVC 1.0). I'm really struggling to get my head around exception handling. I've spent a lot of time on the web but not found anything along the lines of what I'm after. We currently use a filter attribute that implements IExceptionFilter. We decorate a base controller class with th...
When to log exception?
try { // Code } catch (Exception ex) { Logger.Log("Message", ex); throw; } In the case of a library, should I even log the exception? Should I just throw it and allow the application to log it? My concern is that if I log the exception in the library, there will be many duplicates (because the library layer will log it, the ...