public WmErrorGer(WmErrorMsg errorMsg)
{
ErrorMsg = errorMsg;
}
/// <summary>
/// Display an error message to the user and exit the application if
/// required.
/// </summary>
public static void HandleError(String errorMessage, bool fatalFlag)
{
string msg = "An error has been detected." +
Environment.NewLine + Environment.NewLine +
errorMessage +
Environment.NewLine + Environment.NewLine;
if (fatalFlag)
{
msg += "Please restart your " + KwmStrings.Kwm;
}
else
{
msg += "Please contact your technical support for further information.";
}
// Transient error. Queue the message to be displayed.
if (!fatalFlag)
{
WmErrorMsg em = new WmErrorMsg();
em.Ex = new Exception(errorMessage);
WmErrorGer ger = new WmErrorGer(em);
ger.Queue();
return;
}
// The .Net framework is critically brain damaged when it comes to
// handling fatal errors. There are basically two choices: exit
// the process right away or try to get the application to display
// the error and quit.
//
// The former choice is sane; there is no risk of further data
// corruption if the process exits right away. The lack of any
// error message is problematic however. We work around this by
// spawning an external program, if possible, to report the error
// before exiting the process.
//
// The second choice cannot be done sanely. If a MessageBox()
// call is made immediately when the error is detected, then
// the UI will be reentered and the damage may spread further.
// Typically this causes multiple fatal error messages to
// appear. After some investigation, I believe this is impossible
// to prevent. The best available thing is ThreadAbortException,
// which has weird semantics and is considered deprecated and
// doesn't do the right thing in worker threads.
// Exit right away.
if (!FatalErrorMsgOKFlag || m_fatalErrorCaughtFlag)
Environment.Exit(1);
// We have caught a fatal error. Prevent the other threads from
// spawning a fatal error. There is an inherent race condition
// here which is best left alone; mutexes have no business here.
m_fatalErrorCaughtFlag = true;
// Bad error handling.
MessageBox.Show(errorMessage);
// Get out.
Environment.Exit(1);
}
