Catch Log4net Exceptions / Use Try / Catch Approach

Jan 23, 2012

I 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.

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Try/Catch - "Don't Catch Exceptions That You're Not Willing To Deal With"

Apr 20, 2010

A 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]

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Uses Of Try Catch For Exceptions?

Jun 10, 2009

When you use Try Catch for Exceptions, will
Catch ex As Exception
Catch any possible error that could occur or do you have to catch each exception separately?

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Way To Catch These Exceptions

Feb 4, 2011

Is there a way to catch these Exceptions? (I am not looking for "just put try/catch or on error goto around them"). I am trying to find out if these errors can be caught by something outside of them.[code]...

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Catch All SQL Exceptions In A Project?

Aug 17, 2010

Is there a way to catch all SQL exceptions in a project? I have several gridviews and multiple sqldatasources and most of the errors are going to occur when a user enters something incorrectly or in the wrong column. So how do I stop the Server Error in /Project page from showing up?

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Try / Catch Not Trapping Exceptions

Mar 25, 2011

I am working on an app that uses a third-party charting component.It is a .Net component. There have been some occasions when exceptions have occurred inside the third-party component code, but my try/catch is not trapping them.Should they get trapped?My code is structured roughly like this:[code]I have since found and fixed what was causing the exceptions, but I would have thought that this should trap them. What happens when I run in the IDE is that it crashes and Visual Studio throws up a page telling me there is no code available to debug, and no disassembly available.Fair enough, but I repeat - why doesn't the exception get trapped?

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Catch Exceptions In Finally Block?

Oct 13, 2010

Is there some special way to catch exceptions in finally block ?

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How To Catch Unhandled Exceptions In Custom Controls

Jan 5, 2012

Is there anything similar to the MyApplication_UnhandledException for an user control in VB?
I would like to have a central point where to catch all unhandled exceptions of a user control, without propagating the exception to the application that uses the user control. I made some test raising an exception in a method of my user control where there is no try/catch code (of course in the true project all methods have a try/catch block). The exception was caught by MyApplication_UnhandledException event of the application using the user control. But this is too "far" from the point where the exception happens and in worst case the user should restart the application.

I would like to realize a behaviour for the user control in order that if the user control fails, the exception is not propagated till the application, but just caught at user control level.

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Trap Any Exceptions With Try Catch Finally If The Reader?

Apr 8, 2011

I have a SqlDataReader and I want to trap any exceptions with Try Catch Finally if the reader =cmd.ExecuteReader() statement fails. If this statement throws an exception do I need to close the reader? If so, where. Wherever I place the reader.close() statement I get an error that the reader has not been assigned a value yet.

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Catch Exceptions Without Defining A Local Exception Variable?

Apr 6, 2011

[Code]...

Notice the catch (Type) instead of catch (Type myVariable). Is this possible with VB.NET, or do you always have to declare a variable when you catch exception types, like so:

[Code]...

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Thread Safe To Throw And Catch Shared Exceptions?

Jan 25, 2010

so i have a Method that is going to made Thread Safe. can i have something like this in the Method:

Public Class Q Private Shared ASD As New MyException("") Public Sub W Throw ASD if multiple threads attempt to throw the Shared exception ASD, will there be an error in the catching part? The alternative of course is to: Throw New ASD but i'm just checking to see if the first way is thread safe

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Catch All Un-handled Exceptions In A .net Assembly (library Type, Not Application)?

Apr 2, 2011

I 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?

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Is Try / Catch / Finally Required With Using Statement In Order To Handle Exceptions

Jan 31, 2012

I wonder how to use statement handles exceptions?Do I need to wrap the using statements with a Try/Cath/Finally clause in order to be sure that the SqlConnection object is closed and disposed even if the containing code throws an exception? [code]

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Possible In .Net To Catch All Unhandled Exceptions From Any Method In A Class Before Its Passed Up The Call Stack?

Oct 19, 2011

I would like to catch any exceptions from any method in a class so that I may record class specific data to the exception for logging before it is passed up the stack. I know that I can put a try-catch in every method of the class, but there are many methods and It seems there should be a more efficient way. Example of what I am currently doing:

public class ClassA
{
private int x;

[code].....

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Error - Catch Cannot Catch Type 'Microsoft.Office.Interop.Outlook.Exception'

Mar 25, 2011

I 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.

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Restructure Try / Catch To Eliminate Error On Myreader.close Command In Catch Part?

Jun 19, 2012

The 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]

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Button_click Event Will Not Stop Execute After Error Catch Using Try - Catch Statement

Apr 1, 2011

i 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.

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Nested Try...Catches - If An Exception Occurs In The 2nd Sub's Try...Catch, Which Catch Gets Excecuted?

Mar 4, 2009

I 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].....

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If Throw An Exception From Within A Catch, Does The Finally (from The Catch) Still Execute

Jun 2, 2009

If 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]....

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Error 68 'Catch' Cannot Catch Type 'Microsoft.Office.Interop.Outlook.Exception' Because It Is Not 'System.Exception'

Feb 12, 2010

I 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]....

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Catch' Cannot Catch Type 'Object' Because It Is Not 'System.Exception' Or A Class That Inherits From 'System.Exception'

Aug 10, 2010

I'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]....

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Exceptions - Can The "Throw" Statement Exist In A Block With No Try/catch Statement

Oct 5, 2009

how to use them then before, but am still a little confused with a few aspects. Here goes:

1.) Lets say you have a method that checks for a certain condition(s) and if it fails Throws an exception. Does it have to be in a try/catch block? Meaning can the "Throw" statement exist in a block with no try/catch statement?

2.) Now lets say we have a method that has a try catch block and in it there is a throw statement. When the throw statement is executed does it first try to find an appropriate catch block in the same method or does it immediately go back to the calling method without looking at the catch statements in the current method where the exception was thrown?

3.) I created a custom exception class that inherits from ApplicationException. Next I created a method which has a catch block that catches this type of exception and does some action. Is the System(i.e CLR) smart enough to throw an exception of this type, or does it only throw exceptions from SystemException?

4.) I know that some people are more liberal in their use of exceptions and others use it more sparingly when truly strange stuff happen like the DB going down. I am writing code where I am getting some info back from the database, converting it and then storing it. Sometimes there might be data that comes back from the database and other times the field is empty and the Null value comes back. Therefore in the instances where Null comes back from the database I should not convert the value to anything, since I will get an error. What should I do in this situation? Should I let the CLR throw the exception when it goes to convert the Null value or should I check for the Null value and if it exists not convert?

5.) In general when I throw exceptions, is it sensible to only throw exceptions of the type Application Exception or are there instances where the programmer throws exceptions of the type SystemException?

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'Catch' Cannot Catch Type 'exception' Because It Is Not 'System.Exception'?

Apr 16, 2012

I 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?

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C# - Use Case For Try-catch-finally With Both Catch And Finally

Feb 17, 2010

I 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.

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How To Catch 'fn+' Key

Dec 11, 2011

I 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.

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.net - Try Catch Within While Loop?

Feb 14, 2011

I 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.

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.net Print Out Try And Catch?

Apr 20, 2011

I still looking for the answer, while I'm still trying this Visual Studio to develop some web app using VB.net language.

[Code]...

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C# - How To Catch TypeInitializationException

Feb 14, 2011

How 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.

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Catch Error On Msg ID #?

Apr 19, 2012

With 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.

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Catch Inner Exception In NET?

Oct 13, 2009

How 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]...

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