AdvancedLauncher.Management.Internal.UpdateManager.GetFileSystem C# (CSharp) Method

        private IFileSystemManager GetFileSystem(GameModel model)
        {
            if (model == null) {
                throw new ArgumentException("model argument cannot be null");
            }
            IFileSystemManager fileSystem;
            if (FileSystems.TryGetValue(model, out fileSystem)) {
                return fileSystem;
            }
            fileSystem = App.Kernel.Get<IFileSystemManager>();
            FileSystems.TryAdd(model, fileSystem);
            fileSystem.WriteStatusChanged += (s, e) => {
                OnStatusChanged(UpdateStatusEventArgs.Stage.INSTALLING, 1, 1, e.FileNumber, e.FileCount, 0, 1);
            };
            return fileSystem;
        }