Gymnastika.Common.Navigation.NavigationService.EnsureState C# (CSharp) Méthode

        private ViewState EnsureState(
            string regionName, string viewName, string stateName, NavigationDescriptor descriptor)
        {
            ViewState viewState = null;

            if (!string.IsNullOrEmpty(stateName))
            {
                if (descriptor.States == null ||
                    (viewState = descriptor.States.SingleOrDefault(x => x.Name == stateName)) == null)
                {
                    throw new InvalidOperationException(
                        string.Format("{0}_{1}_{2} does not exist", regionName, viewName, stateName));
                }
            }

            return viewState;
        }