How to send arguments to a running Process in C#?

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What is the correct way to create a single-instance application? 35 answers

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I use this: https://code.msdn.microsoft.com/windowsapps/CSWinFormSingleInstanceApp-d1791628

It's single instance, and supports command line args. My program is started like this:

[STAThread]
static void Main(String [] args) {
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);

    Form1 mf = new Form1(); // your form
    SingleInstanceAppStarter.Start(mf, StartNewInstance);
}

...

private static void StartNewInstance(object sender, StartupNextInstanceEventArgs e) {
    String cmdArg = e.CommandLine[1]; // yes, 1 to get the first.  not zero.
    ...
}

You'll also need this:

class SingleInstanceAppStarter
{
    static SingleInstanceApp app = null;

    public static void Start(Form f, StartupNextInstanceEventHandler handler)
    {
        if (app == null && f != null)
        {
            app = new SingleInstanceApp(f);
        }
        app.StartupNextInstance += handler;
        app.Run(Environment.GetCommandLineArgs());
    }
}

and this:

class SingleInstanceApp : WindowsFormsApplicationBase
{
    public SingleInstanceApp() { }

    public SingleInstanceApp(Form f)
    {
        base.IsSingleInstance = true;
        this.MainForm = f;
    }
}

Note that both of those classes use the Microsoft.VisualBasic.ApplicationServices assembly (You'll have to reference it).

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