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WPF app never appears if showing a MessageBox during App constructor!?

Posted By:      Posted Date: September 15, 2010    Points: 0   Category :WPF
My App class' constructor calls a method called initDataStructures. Here I want to load a file with data if it exists. However, as always, it's not guaranteed I can access the file - in my case, the most likely situation (it's a CSV file) is that the file is open in Excel. In this case I would like to show a dialog box, and the user can then choose to ignore the problem (and lose previously saved data) or exit the application (to try again after taking some action, such as closing the file in Excel). This code is in initDataStructures(), called from the App constructor: if (File.Exists(SubmissionsFileName)) { try { using (var reader = new CsvReader(File.OpenRead(SubmissionsFileName), ';')) { ... } } catch (IOException ex) { //string nl = Environment.NewLine; //string msg = "IOException caught while attempting to load previously recorded submissions. " // + "Press OK to ignore (lose previously saved submissions), Cancel to exit. " + nl + nl // + "Message: " + nl + nl + "{0}"; //var response = MessageBox.Show(string.Format(msg, ex.Message), "Loading error", MessageBoxButton.OKCancel, MessageBoxImage.Exclamation); //if (response == MessageBoxResult.Cancel) //{ // submissions = null; // Shutdown(); //} } } If I uncomment the commented li

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