[wix-users] Message Box in Wix Control & Custom Action

[Nir Bar]

You can do both ways:

For C# custom action, use session.Message() with InstallMessage.User, InstallMessage.Warning or InstallMessage.Error for first parameter.
The function uses the underlying MsiProcessMessage() API which takes care of UI level.

For the MSI approach, author a dialog to display the message you need and then in the PushButton publish a SpawnDialog event.

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Nir Bar, Independent WiX Expert. Creator of-
JetBA: WiX WPF Bootstrapper User Interface Framework

JetBA++: WiX Native Bootstrapper User Interface Framework