在除修复之外的所有情况下，如何在InstallShield中执行某些操作？

I've configured an InstallShield setup to delete certain VDs from IIS right before the InstallFiles action. The code is being called within the "OnInstallFilesActionBefore" event. This works fine, except that I don't want the VDs to be removed if the setup is repairing.I've configured an InstallShield setup to delet