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POLaunching a CustomAction UI written with WPF from a WIX installer: Fail on STAThread issue
 

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  1. POLaunching a CustomAction UI written with WPF from a WIX installer: Fail on STAThread issue
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    <p>My WIX installer launches an immediate custom action. The custom action starts a WPF dialog prompting the user for a BD connection parameters (I basically wrote the 'new connection' DB prompter dialog in WPF, to get me a connection string that the custom action can inject in the installed application's configuration file). The WIX code is fairly simple to figure out, and I know I execute the custom action just fine - I put there a MessageBox and a MmsiBreak on the call to my custom action method. I get there without a problem. When the custom action instantiates my WPF dialog window, I get an InvaliOperationException: "The calling thread must be STA, because many UI components require this". </p> <p>The same code runs fine when I put it in a standard WPF application, because VisualStudio generates boiler plate code with Main() that has a STAThreadAttribute on it. I can't tack that attribute on the msiexec caller, and if I try to set the thread apartment state in my custom action, it fails:</p> <pre><code>Thread.CurrentThread.SetApartmentState(ApartmentState.STA); </code></pre> <p>Is not supposed to work for framework past 2.0.</p> <p>Is there any way to do what I'm trying to do here? I'd appreciate some pointers.</p> <hr> <h2>EDIT</h2> <p>I even tried to run the dialog in its own thread, e.g. the code is like this:</p> <pre><code>// Static class members static ManualResetEvent _done = new ManualResetEvent(false); static ActionResult _caResult; static Session _session; static Thread _worker; [CustomAction] static public ActionResult PromptForDB(Session session) { _session = session; _worker = new Thread(WorkerThread); _worker.Start(); _done.WaitOne(); return _caResult; } [STAThread] static void WorkerThread() { try { Prompter wnd = new Prompter(); if (!(bool)wnd.ShowDialog()) { _caResult = ActionResult.SkipRemainingActions; } else { // Harvest our properties (omitted from this post) _caResult = ActionResult.Success; } catch (Exception ex) { _caResult = ActionResult.Failure; _session.Log("Error: " + ex.Message); } finally { _done.Set(); } } </code></pre> <p>That does not work either.</p>
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