WIn_RustTools/RustTools/App.xaml.cs

using System.Threading;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.UI.Xaml;

using RustTools.Activation;
using RustTools.Contracts.Services;
using RustTools.Core.Contracts.Services;
using RustTools.Core.Services;
using RustTools.Helpers;
using RustTools.Models;
using RustTools.Services;
using RustTools.ViewModels;
using RustTools.Views;
using System.Threading;

namespace RustTools;

// To learn more about WinUI 3, see https://docs.microsoft.com/windows/apps/winui/winui3/.
public partial class App : Application
{
    // The .NET Generic Host provides dependency injection, configuration, logging, and other services.
    // https://docs.microsoft.com/dotnet/core/extensions/generic-host
    // https://docs.microsoft.com/dotnet/core/extensions/dependency-injection
    // https://docs.microsoft.com/dotnet/core/extensions/configuration
    // https://docs.microsoft.com/dotnet/core/extensions/logging
    public IHost Host
    {
        get;
    }

    public static T GetService<T>()
        where T : class
    {
        if ((App.Current as App)!.Host.Services.GetService(typeof(T)) is not T service)
        {
            throw new ArgumentException($"{typeof(T)} needs to be registered in ConfigureServices within App.xaml.cs.");
        }

        return service;
    }

    public static WindowEx MainWindow { get; } = new MainWindow();

    public static UIElement? AppTitlebar { get; set; }

    public App()
    {
        InitializeComponent();
        System.Diagnostics.Process[] myProcesses = System.Diagnostics.Process.GetProcessesByName("RustTools");//获取指定的进程名   
        if (myProcesses.Length > 1) //如果可以获取到知道的进程名则说明已经启动
        {
            Exit();              //关闭系统
        }

        Host = Microsoft.Extensions.Hosting.Host.
        CreateDefaultBuilder().
        UseContentRoot(AppContext.BaseDirectory).
        ConfigureServices((context, services) =>
        {
            // Default Activation Handler
            services.AddTransient<ActivationHandler<LaunchActivatedEventArgs>, DefaultActivationHandler>();

            // Other Activation Handlers

            // Services
            services.AddSingleton<ILocalSettingsService, LocalSettingsService>();
            services.AddSingleton<IThemeSelectorService, ThemeSelectorService>();
            services.AddTransient<INavigationViewService, NavigationViewService>();

            services.AddSingleton<IActivationService, ActivationService>();
            services.AddSingleton<IPageService, PageService>();
            services.AddSingleton<INavigationService, NavigationService>();

            // Core Services
            services.AddSingleton<IFileService, FileService>();

            // Views and ViewModels
            services.AddTransient<SettingsViewModel>();
            services.AddTransient<SettingsPage>();

            services.AddTransient<HomePageViewModel>();
            services.AddTransient<HomePage>();
            services.AddTransient<ConcernViewModel>();
            services.AddTransient<Concern>();
            services.AddTransient<RankingViewModel>();
            services.AddTransient<RankingPage>();
            services.AddTransient<UserViewModel>();
            services.AddTransient<UserPage>();

            services.AddTransient<ShellPage>();
            services.AddTransient<ShellViewModel>();

            // Configuration
            services.Configure<LocalSettingsOptions>(context.Configuration.GetSection(nameof(LocalSettingsOptions)));
        }).
        Build();

        UnhandledException += App_UnhandledException;
    }

    private void App_UnhandledException(object sender, Microsoft.UI.Xaml.UnhandledExceptionEventArgs e)
    {
        // TODO: Log and handle exceptions as appropriate.
        // https://docs.microsoft.com/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.application.unhandledexception.
    }

    protected async override void OnLaunched(LaunchActivatedEventArgs args)
    {
        base.OnLaunched(args);

        await App.GetService<IActivationService>().ActivateAsync(args);
    }

    private Mutex mutex;
    private void InitializeMutex()
    {
        // Mutex name should be unique for your application.
        string mutexName = "Global\\MyWinUIAppMutex";
        bool createdNew;

        // Try to create the Mutex. If it fails, another instance is already running.
        mutex = new Mutex(true, mutexName, out createdNew);
        if (!createdNew)
        {
            // Another instance is already running.
            Environment.Exit(0); // Exit the current application.
        }

        // Clean up the Mutex when the application exits.
        //Current.Exiting += (sender, args) =>
        //{
        //    mutex.Close();
        //    mutex.Dispose();
        //};
    }
}