Hi all
I want to be able to throw a custom error up the call stack. I have looked
around and it seems as though it's possible, but I can't get it to work
:o( Below is some sample code.
------------------------------------------------------------
Public Class MainForm
Public Sub Show Form
Try
Dim f As New Form1
f.Show
Catch Ex As MyCustomException
'// Handle the custom exception
Finally
'// Clean-up
End Try
End Sub
End Class
Public Class Form1
Public Sub New()
MyBase.New
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
Try
'// Perform some stuff that might encounter an error
Catch Ex As Exception
Throw New MyCustomException '// I want to throw my exception up to
MainForm
End Try
End Sub
End Class
--------------------------------------------------------------
In the Sub New I will be getting information from a database and also doing
other things, these could result in an Exception. I want to be able to trap
the exception, and then create a new custom exception and have that thrown
up the call stack to the MainForm which would deal with it. If I try to
Throw my custom exception at the moment, the Catch Ex As MyCustomException
does not execute, if I put in a Catch Ex As Exception, then that will
execute.
How do I throw my custom object (which inherits from Exception) and then
catch that object up the call stack.
Regards,
Steve. 6 1557
Hiya
I have just noticed that my Custom Exception is being added in to an
Exception Object as the Inner Exception. Eg. Ex.InnerException =
MyCustomException
How woud I get my Exception to be the top most Exception? So Ex =
MyCustomException.
Regards,
Steve.
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message
news:eg**************@TK2MSFTNGP14.phx.gbl... Hi all
I want to be able to throw a custom error up the call stack. I have looked around and it seems as though it's possible, but I can't get it to work :o( Below is some sample code.
------------------------------------------------------------ Public Class MainForm Public Sub Show Form Try Dim f As New Form1 f.Show Catch Ex As MyCustomException '// Handle the custom exception Finally '// Clean-up End Try End Sub End Class
Public Class Form1 Public Sub New() MyBase.New 'This call is required by the Windows Form Designer. InitializeComponent() 'Add any initialization after the InitializeComponent() call Try '// Perform some stuff that might encounter an error Catch Ex As Exception Throw New MyCustomException '// I want to throw my exception up to MainForm End Try End Sub End Class --------------------------------------------------------------
In the Sub New I will be getting information from a database and also
doing other things, these could result in an Exception. I want to be able to
trap the exception, and then create a new custom exception and have that thrown up the call stack to the MainForm which would deal with it. If I try to Throw my custom exception at the moment, the Catch Ex As MyCustomException does not execute, if I put in a Catch Ex As Exception, then that will execute.
How do I throw my custom object (which inherits from Exception) and then catch that object up the call stack.
Regards, Steve.
Steve,
Which version of VS.NET? With VS.NET 2003 I am not able to reproduce your
problem.
What exception are you seeing instead of MyCustomException?
I would recommend including the exception you caught as an inner exception
when you throw a new MyCustomException.
Hope this helps
Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message
news:eg**************@TK2MSFTNGP14.phx.gbl... Hi all
I want to be able to throw a custom error up the call stack. I have looked around and it seems as though it's possible, but I can't get it to work :o( Below is some sample code.
------------------------------------------------------------ Public Class MainForm Public Sub Show Form Try Dim f As New Form1 f.Show Catch Ex As MyCustomException '// Handle the custom exception Finally '// Clean-up End Try End Sub End Class
Public Class Form1 Public Sub New() MyBase.New 'This call is required by the Windows Form Designer. InitializeComponent() 'Add any initialization after the InitializeComponent() call Try '// Perform some stuff that might encounter an error Catch Ex As Exception Throw New MyCustomException '// I want to throw my exception up to MainForm End Try End Sub End Class --------------------------------------------------------------
In the Sub New I will be getting information from a database and also doing other things, these could result in an Exception. I want to be able to trap the exception, and then create a new custom exception and have that thrown up the call stack to the MainForm which would deal with it. If I try to Throw my custom exception at the moment, the Catch Ex As MyCustomException does not execute, if I put in a Catch Ex As Exception, then that will execute.
How do I throw my custom object (which inherits from Exception) and then catch that object up the call stack.
Regards, Steve.
Hi Jay
I am using 2003, but it appears to be working now! I've lost count the
amount of times something doesn't work but suddenly does the next day :o)
I am having 1 more difficulty though, when I populate my custom exception I
set the properties such as Message, InnerException etc... but when the
exception is shown the message simply reads 'Error in the application'. When
I step through the code I set the properties, and I can see the module level
variables change, but the property doesn't. The Properties have to be
declared as Shadows, is this the reason the Message is not being displayed
correctly?
Here is the code for my Class:
-----------------------------------------------
Public Class MyCustomException
Inherits ApplicationException
Public Sub New(ByVal Ex As Exception)
With Me
..InnerException = Ex
..Message = Ex.Message.ToString
..Source = Ex.Source.ToString
..StackTrace = Ex.StackTrace.ToString
..TargetSite = Ex.TargetSite
..HelpLink = Ex.HelpLink
End With
End Sub
Public Sub New(ByVal Ex As Exception, ByVal dataSet As DataSet)
With Me
..InnerException = Ex
..Message = Ex.Message.ToString
..Source = Ex.Source.ToString
..StackTrace = Ex.StackTrace.ToString
..TargetSite = Ex.TargetSite
..HelpLink = Ex.HelpLink
..DataSet = dataSet
End With
End Sub
Public Shadows Property InnerException() As Exception
Get
Return m_InnerException
End Get
Set(ByVal Value As Exception)
m_InnerException = Value
End Set
End Property
Public Overrides Property Source() As String
Get
Return m_Source
End Get
Set(ByVal Value As String)
m_Source = Value
End Set
End Property
Public Shadows Property Message() As String
Get
Return m_Message
End Get
Set(ByVal Value As String)
m_Message = Value
End Set
End Property
Public Shadows Property TargetSite() As Reflection.MethodBase
Get
Return m_TargetSite
End Get
Set(ByVal Value As Reflection.MethodBase)
m_TargetSite = Value
End Set
End Property
Public Shadows Property StackTrace() As String
Get
Return m_StackTrace
End Get
Set(ByVal Value As String)
m_StackTrace = Value
End Set
End Property
Public Shadows Property HelpLink() As String
Get
Return m_HelpLink
End Get
Set(ByVal Value As String)
m_HelpLink = Value
End Set
End Property
Public Property DataSet() As DataSet
Get
Return m_oDataSet
End Get
Set(ByVal Value As DataSet)
m_oDataSet = Value
End Set
End Property
End Class
-----------------------------------------------------
So when I read the MyCustomException.Message property, it doesn't return the
value in m_Message but returns the text I described above.
Regards,
Steve
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message
news:eS**************@TK2MSFTNGP14.phx.gbl... Steve, Which version of VS.NET? With VS.NET 2003 I am not able to reproduce your problem.
What exception are you seeing instead of MyCustomException?
I would recommend including the exception you caught as an inner exception when you throw a new MyCustomException.
Hope this helps Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message news:eg**************@TK2MSFTNGP14.phx.gbl... Hi all
I want to be able to throw a custom error up the call stack. I have
looked around and it seems as though it's possible, but I can't get it to work :o( Below is some sample code.
------------------------------------------------------------ Public Class MainForm Public Sub Show Form Try Dim f As New Form1 f.Show Catch Ex As MyCustomException '// Handle the custom exception Finally '// Clean-up End Try End Sub End Class
Public Class Form1 Public Sub New() MyBase.New 'This call is required by the Windows Form Designer. InitializeComponent() 'Add any initialization after the InitializeComponent() call Try '// Perform some stuff that might encounter an error Catch Ex As Exception Throw New MyCustomException '// I want to throw my exception up to MainForm End Try End Sub End Class --------------------------------------------------------------
In the Sub New I will be getting information from a database and also doing other things, these could result in an Exception. I want to be able to trap the exception, and then create a new custom exception and have that
thrown up the call stack to the MainForm which would deal with it. If I try to Throw my custom exception at the moment, the Catch Ex As
MyCustomException does not execute, if I put in a Catch Ex As Exception, then that will execute.
How do I throw my custom object (which inherits from Exception) and then catch that object up the call stack.
Regards, Steve.
Steve, The Properties have to be declared as Shadows, is this the reason the Message is not being displayed correctly?
Correct.
You should not Shadow base class members! Shadows is used primarily for
version control. For example: You release version one of your
MyCustomException with a specific method, MS release .NET 2.0 with the same
method in System.ApplicationException, Shadows is used in this case to allow
you to continue using your method, while the base class can use its own
version of the method.
I was suggesting you pass the exception you caught to the base constructor:
Optionally I would allow users of the exception to specify a Message, and
not specify the innerException, something like:
Public Class MyCustomException
Inherits ApplicationException
Private ReadOnly m_dataSet As DataSet
Public Sub New()
MyClass.New(Nothing, Nothing, Nothing)
End Sub
Public Sub New(ByVal message As String)
MyClass.New(message, Nothing, Nothing)
End Sub
Public Sub New(ByVal innerException As Exception)
MyClass.New(Nothing, innerException, Nothing)
End Sub
Public Sub New(ByVal dataSet As DataSet)
MyClass.New(Nothing, Nothing, dataSet)
End Sub
Public Sub New(ByVal message As String, ByVal innerException As
Exception)
MyClass.New(message, innerException, Nothing)
End Sub
Public Sub New(ByVal message As String, ByVal dataSet As DataSet)
MyClass.New(message, Nothing, dataSet)
End Sub
Public Sub New(ByVal innerException As Exception, ByVal dataSet As
DataSet)
MyClass.New(Nothing, innerException, dataSet)
End Sub
Public Sub New(ByVal message As String, ByVal innerException As
Exception, ByVal dataSet As DataSet)
MyBase.New(message, innerException)
m_dataSet = dataSet
End Sub
Public ReadOnly Property DataSet() As DataSet
Get
Return m_dataSet
End Get
End Property
End Class
NOTE: The MyClass.New allows you to call another constructor on the same
class, while MyBase.New allows you to call a base constructor. I chain all
the constructors into one common constructor, then this common constructor
calls the base constructor. I do not show the special constructor required
for serialization.
The following article provides some good information on creating custom
Exception classes. http://msdn.microsoft.com/library/de...rp08162001.asp
The example are in C#, however they should be easy enough to convert to
VB.NET.
Hope this helps
Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl... Hi Jay
I am using 2003, but it appears to be working now! I've lost count the amount of times something doesn't work but suddenly does the next day :o)
I am having 1 more difficulty though, when I populate my custom exception I set the properties such as Message, InnerException etc... but when the exception is shown the message simply reads 'Error in the application'. When I step through the code I set the properties, and I can see the module level variables change, but the property doesn't. The Properties have to be declared as Shadows, is this the reason the Message is not being displayed correctly?
Here is the code for my Class: ----------------------------------------------- Public Class MyCustomException Inherits ApplicationException
Public Sub New(ByVal Ex As Exception) With Me .InnerException = Ex .Message = Ex.Message.ToString .Source = Ex.Source.ToString .StackTrace = Ex.StackTrace.ToString .TargetSite = Ex.TargetSite .HelpLink = Ex.HelpLink End With End Sub
Public Sub New(ByVal Ex As Exception, ByVal dataSet As DataSet) With Me .InnerException = Ex .Message = Ex.Message.ToString .Source = Ex.Source.ToString .StackTrace = Ex.StackTrace.ToString .TargetSite = Ex.TargetSite .HelpLink = Ex.HelpLink .DataSet = dataSet End With End Sub
Public Shadows Property InnerException() As Exception Get Return m_InnerException End Get Set(ByVal Value As Exception) m_InnerException = Value End Set End Property
Public Overrides Property Source() As String Get Return m_Source End Get Set(ByVal Value As String) m_Source = Value End Set End Property
Public Shadows Property Message() As String Get Return m_Message End Get Set(ByVal Value As String) m_Message = Value End Set End Property
Public Shadows Property TargetSite() As Reflection.MethodBase Get Return m_TargetSite End Get Set(ByVal Value As Reflection.MethodBase) m_TargetSite = Value End Set End Property
Public Shadows Property StackTrace() As String Get Return m_StackTrace End Get Set(ByVal Value As String) m_StackTrace = Value End Set End Property
Public Shadows Property HelpLink() As String Get Return m_HelpLink End Get Set(ByVal Value As String) m_HelpLink = Value End Set End Property
Public Property DataSet() As DataSet Get Return m_oDataSet End Get Set(ByVal Value As DataSet) m_oDataSet = Value End Set End Property
End Class -----------------------------------------------------
So when I read the MyCustomException.Message property, it doesn't return the value in m_Message but returns the text I described above.
Regards, Steve
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message news:eS**************@TK2MSFTNGP14.phx.gbl... Steve, Which version of VS.NET? With VS.NET 2003 I am not able to reproduce your problem.
What exception are you seeing instead of MyCustomException?
I would recommend including the exception you caught as an inner exception when you throw a new MyCustomException.
Hope this helps Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message news:eg**************@TK2MSFTNGP14.phx.gbl... > Hi all > > I want to be able to throw a custom error up the call stack. I have looked > around and it seems as though it's possible, but I can't get it to work > :o( Below is some sample code. > > ------------------------------------------------------------ > Public Class MainForm > Public Sub Show Form > Try > Dim f As New Form1 > f.Show > Catch Ex As MyCustomException > '// Handle the custom exception > Finally > '// Clean-up > End Try > End Sub > End Class > > Public Class Form1 > Public Sub New() > MyBase.New > 'This call is required by the Windows Form Designer. > InitializeComponent() > 'Add any initialization after the InitializeComponent() call > Try > '// Perform some stuff that might encounter an error > Catch Ex As Exception > Throw New MyCustomException '// I want to throw my exception up to > MainForm > End Try > End Sub > End Class > -------------------------------------------------------------- > > In the Sub New I will be getting information from a database and also > doing > other things, these could result in an Exception. I want to be able to > trap > the exception, and then create a new custom exception and have that thrown > up the call stack to the MainForm which would deal with it. If I try to > Throw my custom exception at the moment, the Catch Ex As MyCustomException > does not execute, if I put in a Catch Ex As Exception, then that will > execute. > > How do I throw my custom object (which inherits from Exception) and > then > catch that object up the call stack. > > Regards, > Steve. > >
Steve,
I should add, you can override either (or both) the Exception.Message
property & Exception.ToString, if you want to include details from the
dataset, when Exception.Message is displayed or Exception.ToString is used.
Normally I use Exception.Message when I am displaying the exception to the
user, while I use Exception.ToString when I am logging the exception in my
Global Exception Handler.
Hope this helps
Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message
news:%2****************@TK2MSFTNGP12.phx.gbl... Hi Jay
I am using 2003, but it appears to be working now! I've lost count the amount of times something doesn't work but suddenly does the next day :o)
I am having 1 more difficulty though, when I populate my custom exception I set the properties such as Message, InnerException etc... but when the exception is shown the message simply reads 'Error in the application'. When I step through the code I set the properties, and I can see the module level variables change, but the property doesn't. The Properties have to be declared as Shadows, is this the reason the Message is not being displayed correctly?
Here is the code for my Class: ----------------------------------------------- Public Class MyCustomException Inherits ApplicationException
Public Sub New(ByVal Ex As Exception) With Me .InnerException = Ex .Message = Ex.Message.ToString .Source = Ex.Source.ToString .StackTrace = Ex.StackTrace.ToString .TargetSite = Ex.TargetSite .HelpLink = Ex.HelpLink End With End Sub
Public Sub New(ByVal Ex As Exception, ByVal dataSet As DataSet) With Me .InnerException = Ex .Message = Ex.Message.ToString .Source = Ex.Source.ToString .StackTrace = Ex.StackTrace.ToString .TargetSite = Ex.TargetSite .HelpLink = Ex.HelpLink .DataSet = dataSet End With End Sub
Public Shadows Property InnerException() As Exception Get Return m_InnerException End Get Set(ByVal Value As Exception) m_InnerException = Value End Set End Property
Public Overrides Property Source() As String Get Return m_Source End Get Set(ByVal Value As String) m_Source = Value End Set End Property
Public Shadows Property Message() As String Get Return m_Message End Get Set(ByVal Value As String) m_Message = Value End Set End Property
Public Shadows Property TargetSite() As Reflection.MethodBase Get Return m_TargetSite End Get Set(ByVal Value As Reflection.MethodBase) m_TargetSite = Value End Set End Property
Public Shadows Property StackTrace() As String Get Return m_StackTrace End Get Set(ByVal Value As String) m_StackTrace = Value End Set End Property
Public Shadows Property HelpLink() As String Get Return m_HelpLink End Get Set(ByVal Value As String) m_HelpLink = Value End Set End Property
Public Property DataSet() As DataSet Get Return m_oDataSet End Get Set(ByVal Value As DataSet) m_oDataSet = Value End Set End Property
End Class -----------------------------------------------------
So when I read the MyCustomException.Message property, it doesn't return the value in m_Message but returns the text I described above.
Regards, Steve
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message news:eS**************@TK2MSFTNGP14.phx.gbl... Steve, Which version of VS.NET? With VS.NET 2003 I am not able to reproduce your problem.
What exception are you seeing instead of MyCustomException?
I would recommend including the exception you caught as an inner exception when you throw a new MyCustomException.
Hope this helps Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message news:eg**************@TK2MSFTNGP14.phx.gbl... > Hi all > > I want to be able to throw a custom error up the call stack. I have looked > around and it seems as though it's possible, but I can't get it to work > :o( Below is some sample code. > > ------------------------------------------------------------ > Public Class MainForm > Public Sub Show Form > Try > Dim f As New Form1 > f.Show > Catch Ex As MyCustomException > '// Handle the custom exception > Finally > '// Clean-up > End Try > End Sub > End Class > > Public Class Form1 > Public Sub New() > MyBase.New > 'This call is required by the Windows Form Designer. > InitializeComponent() > 'Add any initialization after the InitializeComponent() call > Try > '// Perform some stuff that might encounter an error > Catch Ex As Exception > Throw New MyCustomException '// I want to throw my exception up to > MainForm > End Try > End Sub > End Class > -------------------------------------------------------------- > > In the Sub New I will be getting information from a database and also > doing > other things, these could result in an Exception. I want to be able to > trap > the exception, and then create a new custom exception and have that thrown > up the call stack to the MainForm which would deal with it. If I try to > Throw my custom exception at the moment, the Catch Ex As MyCustomException > does not execute, if I put in a Catch Ex As Exception, then that will > execute. > > How do I throw my custom object (which inherits from Exception) and > then > catch that object up the call stack. > > Regards, > Steve. > >
Hi Jay
Thank you very much for your help, it's much appreciated!
Kind Regards,
Steve
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message
news:eg*************@TK2MSFTNGP11.phx.gbl... Steve, I should add, you can override either (or both) the Exception.Message property & Exception.ToString, if you want to include details from the dataset, when Exception.Message is displayed or Exception.ToString is
used. Normally I use Exception.Message when I am displaying the exception to the user, while I use Exception.ToString when I am logging the exception in my Global Exception Handler.
Hope this helps Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message news:%2****************@TK2MSFTNGP12.phx.gbl... Hi Jay
I am using 2003, but it appears to be working now! I've lost count the amount of times something doesn't work but suddenly does the next day
:o) I am having 1 more difficulty though, when I populate my custom
exception I set the properties such as Message, InnerException etc... but when the exception is shown the message simply reads 'Error in the application'. When I step through the code I set the properties, and I can see the module level variables change, but the property doesn't. The Properties have to be declared as Shadows, is this the reason the Message is not being
displayed correctly?
Here is the code for my Class: ----------------------------------------------- Public Class MyCustomException Inherits ApplicationException
Public Sub New(ByVal Ex As Exception) With Me .InnerException = Ex .Message = Ex.Message.ToString .Source = Ex.Source.ToString .StackTrace = Ex.StackTrace.ToString .TargetSite = Ex.TargetSite .HelpLink = Ex.HelpLink End With End Sub
Public Sub New(ByVal Ex As Exception, ByVal dataSet As DataSet) With Me .InnerException = Ex .Message = Ex.Message.ToString .Source = Ex.Source.ToString .StackTrace = Ex.StackTrace.ToString .TargetSite = Ex.TargetSite .HelpLink = Ex.HelpLink .DataSet = dataSet End With End Sub
Public Shadows Property InnerException() As Exception Get Return m_InnerException End Get Set(ByVal Value As Exception) m_InnerException = Value End Set End Property
Public Overrides Property Source() As String Get Return m_Source End Get Set(ByVal Value As String) m_Source = Value End Set End Property
Public Shadows Property Message() As String Get Return m_Message End Get Set(ByVal Value As String) m_Message = Value End Set End Property
Public Shadows Property TargetSite() As Reflection.MethodBase Get Return m_TargetSite End Get Set(ByVal Value As Reflection.MethodBase) m_TargetSite = Value End Set End Property
Public Shadows Property StackTrace() As String Get Return m_StackTrace End Get Set(ByVal Value As String) m_StackTrace = Value End Set End Property
Public Shadows Property HelpLink() As String Get Return m_HelpLink End Get Set(ByVal Value As String) m_HelpLink = Value End Set End Property
Public Property DataSet() As DataSet Get Return m_oDataSet End Get Set(ByVal Value As DataSet) m_oDataSet = Value End Set End Property
End Class -----------------------------------------------------
So when I read the MyCustomException.Message property, it doesn't return the value in m_Message but returns the text I described above.
Regards, Steve
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in
message news:eS**************@TK2MSFTNGP14.phx.gbl... Steve, Which version of VS.NET? With VS.NET 2003 I am not able to reproduce
your problem.
What exception are you seeing instead of MyCustomException?
I would recommend including the exception you caught as an inner exception when you throw a new MyCustomException.
Hope this helps Jay
"Steve Amey" <stevea@centurion-ms_RemoveThis_.co.uk> wrote in message news:eg**************@TK2MSFTNGP14.phx.gbl... > Hi all > > I want to be able to throw a custom error up the call stack. I have looked > around and it seems as though it's possible, but I can't get it to
work > :o( Below is some sample code. > > ------------------------------------------------------------ > Public Class MainForm > Public Sub Show Form > Try > Dim f As New Form1 > f.Show > Catch Ex As MyCustomException > '// Handle the custom exception > Finally > '// Clean-up > End Try > End Sub > End Class > > Public Class Form1 > Public Sub New() > MyBase.New > 'This call is required by the Windows Form Designer. > InitializeComponent() > 'Add any initialization after the InitializeComponent() call > Try > '// Perform some stuff that might encounter an error > Catch Ex As Exception > Throw New MyCustomException '// I want to throw my exception up
to > MainForm > End Try > End Sub > End Class > -------------------------------------------------------------- > > In the Sub New I will be getting information from a database and also > doing > other things, these could result in an Exception. I want to be able
to > trap > the exception, and then create a new custom exception and have that thrown > up the call stack to the MainForm which would deal with it. If I try
to > Throw my custom exception at the moment, the Catch Ex As MyCustomException > does not execute, if I put in a Catch Ex As Exception, then that will > execute. > > How do I throw my custom object (which inherits from Exception) and > then > catch that object up the call stack. > > Regards, > Steve. > >
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