VeloeAvaloniaKemonoPartyApplication/VeloeAvaloniaKemonoPartyApp/VeloeAvaloniaKemonoPartyApp.Desktop/Services/DesktopStorageService.cs

using Avalonia;
using System.IO;
using System.Reflection;
using System.Threading.Tasks;
using VeloeAvaloniaKemonoPartyApp.Services;

namespace VeloeAvaloniaKemonoPartyApp.Desktop.Services
{
    public class DesktopStorageService : IStorageService
    {
        private string _cacheFolder;
        public DesktopStorageService() 
        {
            _cacheFolder = Directory.GetParent(Assembly.GetEntryAssembly().Location) + "/cache/";

            if (!Directory.Exists(_cacheFolder))
                Directory.CreateDirectory(_cacheFolder);
        }

        public async Task<string?> GetCacheFolderAsync()
        {
            return await Task.FromResult<string?>(_cacheFolder);
        }
    }

    public static class DesktopStorageServiceAppBuilderExtentions
    {
        public static AppBuilder InitStorageService(this AppBuilder appBuilder)
        {
            RegisteredServices.StorageService = new DesktopStorageService();
            return appBuilder;
        }
    }
}