App.xaml.cs

using System;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using VoicemeeterOsdProgram.Core;
using VoicemeeterOsdProgram.Factories;
using VoicemeeterOsdProgram.Helpers;
using VoicemeeterOsdProgram.Options;
using VoicemeeterOsdProgram.Updater;
using VoicemeeterOsdProgram.Updater.Types;

namespace VoicemeeterOsdProgram;

/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
    public App()
    {
        InitializeComponent();
        Current.DispatcherUnhandledException += OnUnhandledException;
    }

    async void OnAppStartup(object sender, StartupEventArgs e)
    {
        var optionsTask = OptionsStorage.InitAsync();
        OptionsStorage.Program.RenderMode = RenderOptions.ProcessRenderMode;
        OptionsStorage.Program.RenderModeChanged += (_, val) => RenderOptions.ProcessRenderMode = val;

        VoicemeeterApiClient.PoolingRate = OptionsStorage.Voicemeeter.ApiPollingRate;
        OptionsStorage.Voicemeeter.ApiPollingRateChanged += (_, val) => VoicemeeterApiClient.PoolingRate = val;

        DpiHelper.Init();
        TrayIconManager.Init();
        OsdWindowManager.Init();
        
        UpdateManager.logger = Globals.Logger;
        UpdateManager.DefaultOS = System.Runtime.InteropServices.OSPlatform.Windows;

        await optionsTask;
        var vmTask = VoicemeeterApiClient.InitAsync((int)OptionsStorage.Voicemeeter.InitializationDelay);

        if (OptionsStorage.Updater.CheckOnStartup)
        {
            var updaterRes = await UpdateManager.TryCheckForUpdatesAsync();
            if (updaterRes == UpdaterResult.NewVersionFound)
            {
                TrayIconManager.OpenUpdater();
            }
        }

        await vmTask;
        await ArgsHandler.HandleAsync(AppLifeManager.appArgs);
        // start to recieve command-line arguments from other launched instance
        AppLifeManager.StartArgsPipeServer();

        Globals.Logger?.Log("Program initialized");

        await CheckProgramDirectoryIOAsync();
    }

    private async Task CheckProgramDirectoryIOAsync()
    {
        const string Msg = "Unable to create files/directories in the program's directory.\n" + 
            "Updater and persistent config might not work.\n\n" + 
            "Possible solution: if program is located in 'Program Files' move it to a different folder/drive";

        string path = AppDomain.CurrentDomain.BaseDirectory;
        bool canCreateDirs = IOAccessCheck.TryCreateRandomDirectory(path);
        bool canCreateFiles = await IOAccessCheck.TryCreateRandomFileAsync(path);
        if (!canCreateDirs || !canCreateFiles)
        {
            var exType = IOAccessCheck.LastException.GetType();
            var d = MsgBoxFactory.GetWarning();
            d.ContentToDisplay.Content = $"{exType}\n{Msg}";
            d.Show();
        }
    }

    private void OnUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
    {
        Globals.Logger?.LogCritical($"Unhandled exception: {e.Exception}");
    }
}