Re: Major problem with uknown exceptions!
From: Ignacio Machin \( .NET/ C# MVP \) ("Ignacio)
Date: 12/06/04
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Date: Mon, 6 Dec 2004 08:55:02 -0500
Hi,
NullReferenceException occur when you access a method,property, etc from an
instance that is null , if you find the instance that is null and either
prevent it or handle it you solve it.
As you are using a third party component it may be possible that it's that
code and not yours where the problem is.
I assume that what you posted below is Exception.StackTrace as it does not
has line numbers it may comes from the third party control, unless you are
compiling it in release and not in debug.
Have you try to contact Infragistics about this?
Cheers,
-- Ignacio Machin, ignacio.machin AT dot.state.fl.us Florida Department Of Transportation "pnp" <pnp.@.softlab.ntua.gr> wrote in message news:egEQGc52EHA.3452@TK2MSFTNGP14.phx.gbl... > Hi all, > I have developed an app in C# and I have used some of the Infragistics > components in it. The problem is that while one is playing with the > windows within the mdi container exceptions occur that are not being > handled by any Exception handler. I have also placed one after the > application run method so if any exception occurs this "sink" will catch > it. But instead an error occurs from an unhandled exception and the > application closes. Any Ideas? The problem is very large since in about 10 > minutes of use such an exception occurs. The problem uses a SQL Server > database and stores information about ones contacts. > > > The errors that occur are: > > ***************************************************** > > System.NullReferenceException: Object reference not set to an instance of > an object. > at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd, > Int32 nCmdShow) > at System.Windows.Forms.Control.SetVisibleCore(Boolean value) > at System.Windows.Forms.Form.SetVisibleCore(Boolean value) > at System.Windows.Forms.Form.ShowDialog(IWin32Window owner) > at System.Windows.Forms.Form.ShowDialog() > at FE.BasicElements.MsgBox..ctor(String Title, String Description, > MsgBoxButtons Buttons, MsgBoxIcon DisplayIcon) in ... > ----------------------------------------------------- > > System.NullReferenceException: Object reference not set to an instance of > an object. > at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) > at > System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 > dwComponentID, Int32 reason, Int32 pvLoopData) > at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, > ApplicationContext context) > at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, > ApplicationContext context) > at System.Windows.Forms.Application.RunDialog(Form form) > at System.Windows.Forms.Form.ShowDialog(IWin32Window owner) > at System.Windows.Forms.Form.ShowDialog() > at System.Windows.Forms.ThreadContext.OnThreadException(Exception t) > at System.Windows.Forms.Control.WndProcException(Exception e) > at System.Windows.Forms.ControlNativeWindow.OnThreadException(Exception > e) > at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, > IntPtr wparam, IntPtr lparam) > at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) > at > System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 > dwComponentID, Int32 reason, Int32 pvLoopData) > at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, > ApplicationContext context) > at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, > ApplicationContext context) > at System.Windows.Forms.Application.Run(Form mainForm) > at FE.MainFrame.LoginScreen.Main()) > ----------------------------------------------------- > > How can I handle these errors so that my app won't close abruptly? > > Thanks in advance, > Peter > >
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