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I have created an C# application that installs MSI's by calling Installer.InstallProduct. I have set the application to be the "external UI" by calling Installer.SetExternalUI and passing an ExternalUIHandler. The MSIs are set to install silently.

Here's my code:

    Installer.EnableLog(InstallLogModes.Verbose, "install.log", true, true);

    Installer.SetInternalUI(InstallUIOptions.Silent);

    Installer.SetExternalUI(OnUIUpdate, InstallLogModes.Progress);

    using (Transaction scope = new Transaction("Transaction1", TransactionAttributes.None))
    {
        foreach (string msi in Installers)
        {
            Installer.InstallProduct(msi, "");
        }
    }

Question:

How do I send a "CANCEL" message from an external UI using DTF to cancel the on-going installation?

Ian
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1 Answers1

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Return MessageResult.Cancel from the UI callback.

Bob Arnson
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