When Catching A General Exception, How To Determine The Original Exception Type
Jan 11, 2010
When catching an exception in .net, you can have as many type-specific exception blocks as needed. But I usually try to have at least one "general" exception catch block. But is there a way to get the type of the "real" exception thrown that is caught by the generic exception handler, perhaps using reflection?For example, if I have
Catch ex As System.ServiceModel.FaultException(Of InvalidUser)
ProcessModuleLoadException(Me, ex)
Catch ex As System.ServiceModel.FaultException(Of SQLExceptions)
[code].....
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Sep 2, 2009
I have a large project where we have 2-3 dll projects that are converted from VB6 to VB.NET. We have fixed all the issues that caused compilation errors, and most of obvious issues in running, so now we have basically a program up and running. The exe is created from scratch in VB.NET, using a lot of functionality from the converted dll's (including GUI forms). What I wonder is when I run the program in debug mode, I get a bunch of warnings in the "Immediate Window" saying:
A first chance exception of type 'System.Exception' occurred in Microsoft.VisualBasic.dll
...and some of other type (but most of them in Microsoft.VisualBasic.dll).I was wondering if this is common in projects converted from VB6, or if it is caused by bad design in our code...
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Apr 14, 2011
I'm trying to catch a user defined permission exception - i.e. a user does something their level of system access won't allow, permission exception is thrown. My problem is, the exception is caught and then rethrown as a genertic System.Exception.Is there any way I can deduce the original exception type, without resorting to string comparisons, like if ex.ToString.Contains("Permission denied"
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Mar 14, 2011
I am trying to catch an exception but occasionally get an inner exception. I want to output both into a label. I often get Object reference not set to instance of an object if there is no inner exception.
Catch ex As Exception
exError = ex.Message.ToString
If Not ex.InnerException.Message Is Nothing Then
[Code]....
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Nov 10, 2010
I have a method as follows:
Public Sub Send()
Dim caughtException As Exception = Nothing
Try
//Attempt action.
Catch ex As Exception //Custom exceptions which can be thrown all inherit from Exception.
//Instantiate error object to be logged.
caughtException = ex
End Try
//Log action and if there is an error log this too.
If caughtException IsNot Nothing Then Throw caughtException
End Sub
It is essential that I log the error for reports, which after research, rethrowing the exception is the right thing to do. What I am concerned about is preservation of stack information. In order to keep the code DRY I am logging the action in one place - after the exception has been caught. This functionality is ultimately exposed via WCF.
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Mar 21, 2012
I was wondering if there was a way to catch all unhandled exceptions in a visual studio project. My project does not have any files named global or global.asax so I was wondering if there was some other way to catch any and all unhandled exceptions? So far I've tried to put exception handling around specific blocks of code, but it doesn't have any effect.
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May 8, 2009
It is possible to catch an exception and throw a new exception which wraps the first exception as an inner exception: [URL] Also, if I call a function and it throws a certain error, but I catch it, will the calling code's catch handler execute? If so, and it is of a higher exception type, is this not wrapping the exception? eg I can throw exception ex of type IndexOutOfRange, log it but rethrow, catch a higher up exception and do something, or I can throw a new exception and wrap an inner exception like:
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Jan 22, 2009
I want to make some exception catching code a little cleaner, if possible.I currently have the below:
Catch ex As System.Exception
If ex.Message.Contains("opened exclusively by another user") And errCnt < 30 Then
sender.ReportProgress(0, "Waiting for database to become available")
[code]....
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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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Nov 9, 2009
What is going on with my code. To .NET and handling SQL connections. I am trying to catch an error where lets say someone puts in something that violates the rules of the field (i.e. they put data in a field that doesn't matched what is on the other table.) Please find teh code I ahve put on the save button to try to catch the error. Instead of popping a message box up the program just closes itself.
Private Sub Job_tableBindingNavigatorSaveItem_Click_2(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Job_tableBindingNavigatorSaveItem.Click
Try
[CODE]...
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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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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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Jul 2, 2010
When I try to create a instance of a COM class it throws an exception as Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))
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Sep 30, 2009
When I try to create a instance of a COM class it throws an exception as Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))
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Jun 19, 2012
i have about 20 possible exception messages that i want thrown when an error occurs.i need somthng like this when catching the exception
Try
' do domthing
Catch ex As CustomInvalidArgumentException
'do domthing
[code]....
do i have to create a class that inherits from Exception for each type of exception?
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Jul 28, 2011
I have the following code :
Imports System.Data.OleDb
Private Sub getData()
Dim connStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:
[Code].....
Exception Text : Can-not find installable ISAM.
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Dec 26, 2009
Is there anyway to create a Custom Exception without inheriting System.Exception?
my reason is that they have a lot of methods which i do not wish my Class to have.
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Feb 10, 2010
I have written a program which uses a SQL exception class and then use it show custom messages for the primary key violation. Also i want the primary key value that caused the violation. How can i get all the primary keys which generated the exception from the sqlexception object.[code]
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Nov 27, 2009
I am getting below exception when i am going to enter record in a table through StoredProceduer of sqlserver i have a field which i need u update immediately after insert of new record in table. for that i created a sotredprocedure in which i wrote insert command first and after that i wrote a update command for same recored but it gave me below error SQlException: Transaction count after EXECUTE indicates a mismatching number of BEGIN and COMMIT statements. Previous count = 1, current count = 2. Uncommittable transaction is detected at the end of the batch. The transaction is rolled back. Some Error in stored procedure execution
[Code]...
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Jan 28, 2012
I have a VB.net application and I have a function with this signature:[code]DebugPackage is a type and can not be used as exception.
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Nov 18, 2011
Exception Message happens when my splash screen shows: The type initializer for 'App_Name.GlobalThings' threw an exception GlobalThings is not a class, but just a module name (Module Globalthings). I get the error above at run time (.exe) but not during debug.Because I am brand new not only to visual studio and to visual basic, but also to programming, I have no how to figure out what is actually throwing this error since it occurs only at run time.
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Oct 5, 2011
I've got a visual basic 2008 application that is giving me a type initializer exception when I run it in debug. The application is running on windows server 2008.There are some .dll files that are added as references and I have some global declarations files.When I run this on my PC (XP) the application runs. When I run it in the server environment, I get the exception.The details are: -[code].....Do I need to install something additonally to the server to get this running?
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Aug 15, 2011
We have just converted a large VB6 desktop app to VB.NET 2008. First via the VB 2005 (open project), then days of fixing errors, etc. Then opened the VB 2005 in VB 2008 so now it is a 2008 solution.The more we try to test the worse it gets. It did start and crash with typical errors but now it does not even get off the ground.[code]The more we try to fix the earlier it crashes. The 1st form load does not even start (break point not stopped on but it did before and failed on AppFrameWorkOn = True where AppFramWorkOn is just a boolean in another module.Except same code works in other programs.We have written several dozen other VB.Net 2005 programs but this one just doesn't make sense.There is also no Configuration Manager in the Build menu.
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Feb 25, 2011
[Code]...
What happens when a user wants to alocate "" as Item(DurationColumn) to integer? I get an exception. clean solution to avoid this and set 0 for ""?
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Apr 15, 2012
i know this may seam odd but I'm getting an error navigating through a datagrid of an invalid cast. The trouble is it is of the same types!! I working on customising some Sage code and in the form there is a datagrid that is populated by a series of Sage.Accounting.Stock.TraceableSOPAllocationItems (a batched stock item allocated to an SOP).
I want to give the user some further information on each item so they can decide which batch and bin to use. I want to go through each item in the grid and then go find this extra information for it. the trouble is when I go to navigate through, My VB.Net code throws the error.InvalidCastException was unhandled by user code, Unable to cast object of type 'Sage.Accounting.Stock.TraceableSOPAllocationItem' to type 'Sage.Accounting.Stock.TraceableSOPAllocationItem'.
[Code]...
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Sep 20, 2011
We have just converted a large VB6 desktop app to VB.NET 2008. First via the VB 2005 (opened the project), then days of fixing errors, etc. Then opened the VB 2005 in VB 2008 so now it is a 2008 solution. There are about 30 forms with code behind and about 40 other modules.
Message InvalidOperationException was unhandled.
... The type initializer for .... threw an error.
on
[code].....
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Feb 15, 2012
i have this code in my btnsave..it can detect conflicts but after that a dialog box saying: An unhandled exception of type 'System.NullReferenceException' occurred in AppointmentSchedulingClient.exe
Additional information: Object reference not set to an instance of an object. and it points to the green one below.
If Val(cbostart.Text) > Val(cboend.Text) Or Val(cbostart.Text) = Val(cboend.Text) Then
MsgBox("Error in time.", MsgBoxStyle.Information, "MESSAGE")
[Code].....
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Feb 1, 2010
i tried getting rid of a few "dim msearch as new" etc. which is what the error msg comes up with. but it just keeps making it worse.[code...]
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Jul 19, 2010
The Type Initializer for <Module> threw an exception?What does this error mean.
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Jun 4, 2009
We have a VB .Net windows application developed with VS 2005, framework 2.0.
The executable when run on a different machine throws the above error. It cannot be caught with the IDE due none of the developers experiencing it.
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