Prevent uninstall in setup project with OnBeforeUninstall

I overrode OnBeforeUninstall to stop my application's setup project from uninstalling it under certain circumstances, but it seems like it is just not being called and has no effect.

protected override开发者_开发知识库 void OnBeforeUninstall(IDictionary savedState)
{
    if (ApplicationIsBusy())
        throw new ApplicationException("Prevent uninstall while application busy.");
}

I am able to cancel uninstall by overriding the Uninstall method, but by then the setup project has already closed my application. How do I "fail" an uninstall attempt when my application is busy before the setup project tries to close it when it is running and interrupts my worker process?

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Make sure that in the setup project you chose the custom action for uninstalling, that s probably your case.

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Before calling your custom code, call the base.OnBeforeUninstall(savedState) so that registered delegates receive the event thereby allowing your custom code to execute before the uninstall.

protected override void OnBeforeUninstall(IDictionary savedState)
{
    // Add this
    base.OnBeforeUninstall(savedState);

    if (ApplicationIsBusy())
        throw new ApplicationException("Prevent uninstall while application busy.");
}