getting string from c# command line and passing it to wpf window

Question

Very newbie question.

I want to overwrite the Main in my WPF app so if I double-click on a file, it will be loaded. My main function is:

    [STAThread]
    static void Main(string[] args)
    {
        FileConvert.App app = new FileConvert.App();
        app.InitializeComponent();

        if (args.Length > 0)
        {
            Window1 wnd1 = (Window1)(app.MainWindow);
            wnd1.SetProjectFile(args[0]);
        }

        app.Run();

My problem is that wnd1 is null. How do I get access to this window so I can pass it the filename to load?

Thanks!

Answer 1

Instead of overwriting the Main method, try overriding the OnStartup method in App.xaml.cs:

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        if (e.Args.Length > 0)
            ((Window1) MainWindow).SetProjectFile(e.Args[0]);
    }
}