/// <include file='doc\EventLogInstaller.uex' path='docs/doc[@for="EventLogInstaller.Uninstall"]/*' />
/// <devdoc>
/// Called to remove the event log source from the machine.
/// </devdoc>
public override void Uninstall(IDictionary savedState)
{
base.Uninstall(savedState);
if (UninstallAction == UninstallAction.Remove)
{
Context.LogMessage(Res.GetString(Res.RemovingEventLog, Source));
if (EventLog.SourceExists(Source, "."))
{
if (string.Compare(Log, Source, true, CultureInfo.InvariantCulture) != 0) // If log has the same name, don't delete the source.
{
EventLog.DeleteEventSource(Source, ".");
}
}
else
{
Context.LogMessage(Res.GetString(Res.LocalSourceNotRegisteredWarning, Source));
}
// now test to see if the log has any more sources in it. If not, we
// should remove the log entirely.
// we have to do this by inspecting the registry.
RegistryKey key = Registry.LocalMachine;
if (key != null)
{
key = key.OpenSubKey("SYSTEM\\CurrentControlSet\\Services\\EventLog\\" + Log, false);
}
if (key != null)
{
string[] keyNames = key.GetSubKeyNames();
if (keyNames == null || keyNames.Length == 0 ||
(keyNames.Length == 1 && string.Compare(keyNames[0], Log, true, CultureInfo.InvariantCulture) == 0) // the only key has the same name as log
)
{
Context.LogMessage(Res.GetString(Res.DeletingEventLog, Log));
// there are no sources in this log. Delete the log.
EventLog.Delete(Log, ".");
}
}
}
// otherwise it's UninstallAction.NoAction, so we shouldn't do anything.
}
/// <summary>Restores the computer to the state it was in before the installation by rolling back the event log information that the installation procedure wrote to the registry.</summary>
/// <param name="savedState">An <see cref="T:System.Collections.IDictionary" /> that contains the pre-installation state of the computer. </param>
public override void Rollback(IDictionary savedState)
{
base.Rollback(savedState);
base.Context.LogMessage(Res.GetString("RestoringEventLog", this.Source));
if (savedState["baseInstalledAndPlatformOK"] != null)
{
if (!(bool)savedState["logExists"])
{
EventLog.Delete(this.Log, ".");
}
else
{
object obj = savedState["alreadyRegistered"];
bool flag = obj != null && (bool)obj;
if (!flag && EventLog.SourceExists(this.Source, "."))
{
EventLog.DeleteEventSource(this.Source, ".");
}
}
}
}
/// <include file='doc\EventLogInstaller.uex' path='docs/doc[@for="EventLogInstaller.Rollback"]/*' />
/// <devdoc>
/// Called when this or another component in the installation has failed.
/// </devdoc>
public override void Rollback(IDictionary savedState)
{
base.Rollback(savedState);
Context.LogMessage(Res.GetString(Res.RestoringEventLog, Source));
if (savedState["baseInstalledAndPlatformOK"] != null)
{
bool logExists = (bool)savedState["logExists"];
if (!logExists)
{
EventLog.Delete(Log, ".");
}
else
{
bool alreadyRegistered;
object alreadyRegisteredObj = savedState["alreadyRegistered"];
if (alreadyRegisteredObj == null)
{
alreadyRegistered = false;
}
else
{
alreadyRegistered = (bool)alreadyRegisteredObj;
}
if (!alreadyRegistered)
{
// delete the source we installed, assuming it succeeded. Then put back whatever used to be there.
if (EventLog.SourceExists(Source, "."))
{
EventLog.DeleteEventSource(Source, ".");
}
}
}
}
}
