CODEWITHSUNDEEP
c#.netwpf
Eric Anastas
Eric Anastas

Reputation: 22233

WPF Window created in Application_Startup method is blank

I have a WPF window in a project with a XAML file and associated C# code behind file. If I set "StartupUri=MainWindow.xaml" in App.xaml to this window the window opens as expected when I start my application.

However, I want my application to to take command line parameters and then decided if it should open the GUI or not. So instead I've set "Startup=Application_Startup" in my App.xaml file which is defined as shown below.

    private void Application_Startup(object sender, StartupEventArgs e)
    {
        if (e.Args.Length > 1)
        {
            //do automated tasks
        }
        else
        {
            //open ui

           MainWindow window = new MainWindow();
            this.MainWindow = window;

            window.Show();
        }
    }

Yet when I run this the window displayed is totally blank.

enter image description here

Upvotes: 8

Views: 7159

Answers (2)

Avram Tudor
Avram Tudor

Reputation: 1526

I created a sample application, and removed the StartupUri and set the Startup to the method you provided. Everything seems to work as expected, the content of the window is displayed, so maybe, as Daniel mentioned, you're missing the call to InitializeComponent method in your MainWindow constructor.

Upvotes: 0

Daniel Gimenez
Daniel Gimenez

Reputation: 20654

Adding window.InitializeComponent() seems to do the trick:

            MainWindow window = new MainWindow();
            Application.Current.MainWindow = window;
            window.InitializeComponent();
            window.Show();

I usually like to have a little explanation on why something does or doesn't work. I have no clue in this case. I can see that the examples online don't include InitializeComponent, and yet I produce the same exact error as you do (event without checking for args).

Upvotes: 10

Related Questions