SSWMS_2230395/SSWMS.Server/App.xaml.cs

using Microsoft.VisualBasic.ApplicationServices;
using System;
using System.Windows;

namespace SSWMS.Server
{
    public partial class App : Application
    {
    }

    public class StartupObject : WindowsFormsApplicationBase
    {
        [STAThread]
        public static void Main(string[] args)
        {
            new StartupObject().Run(args);
        }

        private App app = null;
        private StartupObject()
        {
            this.IsSingleInstance = true;
        }

        protected override bool OnStartup(Microsoft.VisualBasic.ApplicationServices.StartupEventArgs eventArgs)
        {
            app = new App
            {
                StartupUri = new Uri("MainWindow.xaml", UriKind.RelativeOrAbsolute)
            };
            app.Run();
            return false;
        }

        protected override void OnStartupNextInstance(StartupNextInstanceEventArgs eventArgs)
        {
            try
            {
                app.MainWindow.Show();
                app.MainWindow.WindowState = WindowState.Maximized;
                app.MainWindow.Topmost = true;
                app.MainWindow.Activate();
                app.MainWindow.Topmost = false;
            }
            catch
            {
            }
            base.OnStartupNextInstance(eventArgs);
        }
    }
}