Using Try And Catch In An Application?
May 31, 2011What is the best practice to use Try and catch in an application?Does it make sense to use it for each Sub or Function?
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Catch The Error generated By Application
Sep 8, 2010I have written another windows application A. I then use another application B using process to run the application A. My main problem is to catch the error generated by application A so that application B can then perform some actions.
View 7 RepliesHow To Catch Application Titlebar Change
Apr 1, 2011We are running on a Windows Client Platform (generally WinXP) in niche industry program that runs in a 640x480 window back to an AS/400 server. To reduce errors I want to watch for when the title bar of the program changes. Then I need to capture the keyboard entries to validate. I'll then make sure each of the entries is valid since the archaic program does no validation. I'll can then do a pop-up then warning the end-user if errors occur and to reduce/eliminate the exception reports.how can I capture the event of the application title bar change = 'string' that I need? API call? Aiming to do this in VB unless another would be notable cleaner.
View 2 RepliesPlace A Catch And Try To Intercet Any Possible Ecption In An Application?
Dec 30, 2011where do i have to put the Final single Catch and Try in my application to make sure that any possible errors is intercepted (even on other thread) ?
View 8 RepliesTry/catch Unhandled Exception Has Occurred In Your Application?
Jun 12, 2011In my code I am trying to come up with the following messages using a try/catch Unhandled exception has occurred in your application. If you click continue, the application will ignore this error adn attemp to continue. If you click Quit, the application will close immediately.conversion from string """" to type 'integer' is not valid Warning Icon followed by 3 buttons one that saids the DETAILS, another for CONTINUE, and one for QUIT.Here is part of my code. I did use Try/catch correctly, but it doesnt say the message the way i described it above ..
[code]...
Error - Catch Cannot Catch Type 'Microsoft.Office.Interop.Outlook.Exception'
Mar 25, 2011I have a program in VB.Net that receives mails from Outlook, extracts attachments and inserts the attachments into a table through a query. I would like to put the query/queries in a Try/Catch block, but cannot do so as Outlook exceptions cannot be caught, and it gives me an error, and unless I put a very specific exception, I cannot catch it. Is there a workaround?
Edit:
Try
Catch ex As Exception
End Try
Exception is underlined and when I hover on it, it says: "Catch cannot catch type 'Microsoft.Office.Interop.Outlook.Exception' because it is not in 'System.Exception' or a class that inherits from 'System.Exception'". This is affecting all my other code which I'd like to put into a Try/Catch block.
Restructure Try / Catch To Eliminate Error On Myreader.close Command In Catch Part?
Jun 19, 2012The following code causes a "Warning" that Variable is used before value assigned.How do I restructure this Try/catch to eliminate error on the myreader.close command in the Catch part? Code appears to work fine but I dont like Warnings. [code]
View 8 RepliesButton_click Event Will Not Stop Execute After Error Catch Using Try - Catch Statement
Apr 1, 2011i have problem when i click a ADD button, there is one null value in the textbox .. so the try catch statemnt is to catch that null value error but after that the catch is success but the button click never stop excute the statemnt till the end of the button event.
View 6 RepliesNested Try...Catches - If An Exception Occurs In The 2nd Sub's Try...Catch, Which Catch Gets Excecuted?
Mar 4, 2009I have this scenario: in a Sub I have a Try...Catch statement.Within that Try..Catch I call another sub.In that 2nd sub is also a Try...Catch.(see below for example).Now if an exception occurs in the 2nd sub's Try...Catch, which Catch gets excecuted? The 2nd one, the 1st one or both?
Private Sub sub1()
Try
..do stuff[code].....
If Throw An Exception From Within A Catch, Does The Finally (from The Catch) Still Execute
Jun 2, 2009If I throw an exception from within a catch, does the finally (from the catch) still execute? i.e.
Try
..some code with an exception in it...
catch ex as Exception
throw new SpecialException("blah blah" & ex.Message, ex)
[code]....
Catch All Un-handled Exceptions In A .net Assembly (library Type, Not Application)?
Apr 2, 2011I have an assembly containing a number of classes. This is a class library type assembly, not a windows forms application. It's also single threaded.Is there a way to catch all un-handled exceptions so that I can log them?
View 2 RepliesC# - Catch Events In Multi-threaded Application That Can Be Watched By Main Thread?
Dec 4, 2009I have a console application (VB.NET). When it is started, it spawns worker threads to find work in the database and do the task, then look for the next task (A workflow basically).
The problem that I have is that I have my Event Handler in the main thread that spawns the worker threads. Those workers, if they error, raise an event to a public delegate. However my main thread is not detecting these events, and I cannot figure out how to make it. My intention is to do all logging (text/database), email alerts, and restarting the worker to find another task that is not errored. (This will be expanded in the LogErrorMessage routine and such, for now I am just keeping it a simple Console.Writeline so that I can see if the method is being fired or not)
Here is the code around what I am trying to do:
Logger Class:
Public Delegate Sub LogDelegateError(ByVal Ex As Exception)
Public Class EventLogger
Public Event EventError As LogDelegateError
[Code].....
Catch Log4net Exceptions / Use Try / Catch Approach
Jan 23, 2012I need to catch log4net exceptions (its own exceptions not app exceptions logged by it). I wish there's a way of doing it this way: [code] I have this code implemented and there's no errors in compilation but i force log4net to have an error (pointing to a non existing database in the config file) and nothing is threw.I've tried the listener aproach: [code] and it's writing the errors to log4net.txt, the forced ones i mean.This last aproach has a couple of drawbacks: it won't append every error to the file, if the error is the same it doesn't write it, i can't get the listener to write every error to that file, only one (I don't know how to fully configure the trace listener, it might be that). Thus it won't append the date and hour to every line wich is a necesity for me. Finally i can't give structure to it (xml). Even if the listener work i need to use the try/catch aproach, since i'm using ExceptionHandling from Enterprise library to log the errors in my app.
View 1 RepliesError 68 'Catch' Cannot Catch Type 'Microsoft.Office.Interop.Outlook.Exception' Because It Is Not 'System.Exception'
Feb 12, 2010I am using VB.NET 2005 to create a Windows forms application. I have a procedure named SendMail that creates an instance of Outlook.Application, to send an email from my application. I found the code on this forum, I think.The procedure works fine, but I can't use error handling with it.I call the procedure from a button click event. I put the procedure call in a try/catch block, and the application won't build, with the following error.
Error 68 'Catch' cannot catch type 'Microsoft.Office.Interop.Outlook.Exception' because it is not 'System.Exception' or a class that inherits from 'System.Exception'. C:datadevdmtiQTSQTSv7_1_20100212wQTSQTSReportsCriteria
pt_frmReportViewer.vb 43 21 QTS
Here is the code:
Sub SendMail(ByVal sFile As String)
' Create an Outlook application.
Dim oApp As Outlook._Application
[code]....
Can Uninstall Functionality Be Modified To Catch Other Instances Of Application / Also Uninstall Them?
Jun 23, 2011Have a VB.net application that installs initially from CD and then when the user gets into the internet the application updates. In order to better support problems with this application is has been suggested in the past to uninstall it and do a fresh re-install. However, in investigation it was determined that the uninstall does not consider all installed objects and does not uninstall the CD install.Can the uninstall functionality be modified to catch the other instances of this application and also uninstall them?
View 11 RepliesCatch' Cannot Catch Type 'Object' Because It Is Not 'System.Exception' Or A Class That Inherits From 'System.Exception'
Aug 10, 2010I'm getting 'Catch' cannot catch type 'Object' because it is not 'System.Exception' or a class that inherits from 'System.Exception'. and 'Expression detected' Code underlined in blue: Catch obj1 As Object When (?)
Private Sub OpenJAMem()
Dim num3 As Integer
Try
[code]....
'Catch' Cannot Catch Type 'exception' Because It Is Not 'System.Exception'?
Apr 16, 2012I have a project converted from Visual Studio 2005 to Visual Studio 2010. It compiles and runs.
When I prune "unused references's from this project as listed by Visual Studio, the project fails to compile with the subject error message.
In particular one of the "unused refererences" is to "Microsoft.VisualBasic.dll". The IDE does not allow me to add back this particular reference.
What do I need to add back as a referenceto get this items?
Try/Catch - "Don't Catch Exceptions That You're Not Willing To Deal With"
Apr 20, 2010A few weeks back in reply to a thread, I said then that it's sometimes worse to use a Try/Catch when there's nothing in the Catch!There are exceptions to that I'm sure, but too often the Try/Catch is used with a blank Catch that makes even the developer scratch their heads when the program crashes because they have nothing to go on (by their own doing).DevExpress (and I'm a big fan of their stuff) has a little three minute video that encapsulates that concept well and I thought that you all might enjoy watching it:[URL]
View 1 RepliesC# - Use Case For Try-catch-finally With Both Catch And Finally
Feb 17, 2010I understand how try-catch works and how try-finally works, but I find myself using those (usually) in two completely different scenarios:
try-finally (or using in C# and VB) is mostly used around some medium-sized code block that uses some resource that needs to be disposed properly.
try-catch is mostly used either
around a single statement that can fail in a very specific way or (as a catch-all) at a very high level of the application, usually directly below some user interface action.
In my experience, cases where a try-catch-finally would be appropriate, i.e., where the block in which I want to catch some particular exception is exactly the same block in which I use some disposable resource, are extremely rare. Yet, the language designers of C#, VB and Java seem to consider this to be a highly common scenario; the VB designers even think about adding catch to using.
Or am I just overly pedantic with my restrictive use of try-catch?
EDIT: To clarify: My code usually looks like this (functions unrolled for clarity):
Try
do something
Aquire Resource (e.g. get DB connection)
Try
[Code]....
which just seems to make much more sense than putting any of the two catches on the same level as finally just to avoid indentation.
How To Catch 'fn+' Key
Dec 11, 2011I couldn't find a way to catch the event when fn+ another key is pressed. I could only catch other keys and the alt, ctrl and shift key.
View 2 Replies.net - Try Catch Within While Loop?
Feb 14, 2011I have a SQLite database that I wish to read records from and execute a piece of code against each record.I am using a While loop with a Try Catch INSIDE it...Code is as follows:-
result = slcom.ExecuteReader()
'TODO: There is a problem with this while loop whereby if an ex is caught the connection
' to the database is closed.
While result.Read
[code]....
The problem is, once the Try block is entered and an ex is caught, the next iteration of the while loop fails, as it seems the minute an ex is caught the connection to the SQLite database is closed, eventhough the connection properties state that it is open.
.net Print Out Try And Catch?
Apr 20, 2011I still looking for the answer, while I'm still trying this Visual Studio to develop some web app using VB.net language.
[Code]...
C# - How To Catch TypeInitializationException
Feb 14, 2011How can I catch this TypeInitializationException? Don't really care if it is C# or VB.NET code. Here is some sample code of what I am trying to figure out (this is not real code - just something to show what I am dealing with):
Public Class Test
Public Shared testObj as Object = CreateObj()
Public Shared Function CreateObj() as Object
throw new Exception("Ha!")
[code]....
Suppose I have no control over CreateObj method.
Catch Error On Msg ID #?
Apr 19, 2012With Try/Catch is there a way to catch a MSSQL error by Msg ID? I want to catch a 208 when a table is not found and then create it. I found mockup code in C# but nothing VB.NET wise as to how to grab the Error ID.
View 1 RepliesCatch Inner Exception In NET?
Oct 13, 2009How can I catch an inner exception in .NET? I need to check 2 databases for a record. The database code throws an exception if a record is not found, so then I want to check the second database[code]...
View 5 RepliesCatch Multiple Value From .net?
Apr 8, 2010My Procedure Return a Row Like
Book_Title Book_Price Quantity
I use Function, I need to set it my textbox in vb.net
Combine An If/then/else With A Try/catch?
Apr 7, 2011I need to combine an if/then/else with a try/catch and I can't seem to make it work. Basically I need this:
Try
code that might bomb
Catch ex As Exception
[code]....
I thought I could check Err.Number once I was out of the Try/Catch block but that doesn't work because apparently Err.Number exists within the Catch block after an exception is caught, but outside of the Catch block Err.Number is zero again. How can I do what im trying to do? Im about to NOT use try/catch and resort to On Error Resume Next (aaahhhh the days when things were simple and just worked)
How To Catch All Errors
Sep 5, 2009I want to catch all error handling without using try in each sub, since
View 8 RepliesHow To Catch Exception From DLL
Sep 8, 2011I've written a DLL that contains a bunch of classes. One of my methods validates the contents of a file and throws any necessary exceptions based on invalid content - I'm using a standard "throw new exception." call the thing is, when my code reaches the line where the exception is thrown, my Visual Studio IDE hangs up on that line instead of the external call to my validate method.
[Code]...
So my IDE is actually pulling up the VB file that contains the DLL content and highlights the line in the ValidateFile instead of just hanging on the oFC.ValidateFile method line where the exception is thrown instead of the IDE hanging on the oFC.ValidateFile line in my calling application.
I just want user to have access to the any exceptions that are raised. Here if "C:FileThatDoesntExist.txt" file does not exist then Dll throw exception which should be catch through Application.ThreadException.. How to Catch exception from DLL ?
How To Catch This Exception
May 1, 2012System.Data.OleDbException (0x80004005): The changes you requested to the table were not successful because they would create duplicate values in the index, primary key..."I know how to catch all exceptions. But I want to catch THIS SPECIFIC ONE so I can call one of my subroutines to generate a different ID that will not violate the primary key.
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