how does the login form work in WPF?

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I have 2 wpf windows MainWindow.xaml and LoginWindow.xaml. In the file app.g.cs I changed

C#

this.StartupUri = new System.Uri("MainWindow.xaml", System.UriKind.Relative)
this.StartupUri = new System.Uri("LoginWindow.xaml", System.UriKind.Relative)

Now LoginWindow runs at the start up. On log in button click I am using showdialog to show MainWindow and hiding the log in form.

Are there any better ways? because my main program us running as a dialog and I am not sure if it makes any difference?

Posted 17-Apr-13 2:26am

missak boyajian

Updated 17-Apr-13 2:35am

AmitGajjar

v2

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Matej Hlatky · Answer 1 · 2013-04-17T03:20:00

You CANNOT change the app.g.cs file - this file is auto generated by Visual Studio - “Changes to this file may cause incorrect behavior and will be lost if the code is regenerated.”!
Hook to the Application.Startup Event[^] and do your logic there.
Also check the Application.ShutdownMode Property[^].
Sample code used in my WPF project:

C#

private void Application_Startup(object sender, StartupEventArgs e)
{
  // ... init code here...

  // Create new LoginWindow
  var dlg = new LoginWindow();

  // Need to CLEAR MainWindow property
  MainWindow = null;

  // Show LoginWindow as dialog
  if (dlg.ShowDialog() == true) // User is logged-in (dialog returns DialogResult = true)
  {
    // Assign and show MainWindow
    MainWindow = new MainWindow();
    MainWindow.Show();
  }
}

Richard MacCutchan · Answer 2 · 2013-04-17T03:02:00

Solution 1

That does not sound correct. Your main window should always be presented by the normal Show() method, and the login page should use ShowDialog(). In that way the application is paused until the login is completed.

Posted 17-Apr-13 3:02am

Richard MacCutchan