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!

Timwi · Accepted Answer · 2010-08-24 02:25:02Z

5

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]);
    }
}

edited Aug 24, 2010 at 2:25

answered Aug 24, 2010 at 0:06

Timwi

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6 Comments

Steven Sudit Over a year ago

This won't compile, as args is not defined. More deeply, isn't args[0] going to be the name of the executable, not the first parameter?

NVM Over a year ago

@Steven StartupEventArgs.Args is different from args in Main(). Timwi's sample will work just fine (overlooking the fact that args[0] is a copy paste oversight).

Steven Sudit Over a year ago

@NVM: I'm guessing that what you're suggesting here is that, instead of args[0], they should be looking the value up in e.InitParams. If so, I'm not clear on what the key would be.

NVM Over a year ago

args[0] should be e.Args[0] is what I meant.

Timwi Over a year ago

@Steven: As NVM has pointed out, I accidentally left args where I meant to change it to e.Args. More “deeply”, no, e.Args[0] (and args[0] in Main) is the first command-line argument. e.InitParams is only relevant for Silverlight plugins, not for desktop applications, and has nothing to do with the command line.

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