Thank you very much, problem solved

Thank you very much, problem solved

i can't download  you attachments.

When I am through “ this.NavigationService.Navigate<MachineTimeViewModel>();”The navigation view ，not find "MachineTimeViewModel"。"DataListViewModelBase" Can be achieved by "this.NavigationService.Navigate<>"navigation ?

namespace MyInventory.ViewModels{
    public class MachineTimeViewModel: DataListViewModelBase<Item, IItemRepository>
    {
        private ItemQueryDefinition _queryDefinition = null;

        public ItemListViewModel()
        {
            // configure data behaviors
            this.EnableRefresh = true;
            this.EnableIncrementalRefresh = true;
            this.EnableIncrementalLoading = true;
            this.EnableAsyncFilter = true;
            this.IncrementalLoadingSize = 20;

            // commands
            this.LoadIncrementalCommand = new DelegateCommand(ExecuteLoadIncrementalCommand,
                                                           CanExecuteLoadIncrementalCommand);
        }

        public DelegateCommand LoadIncrementalCommand
        {
            get;
            set;
        }

        public override string TitleText
        {
            get
            {
                if (this.Items != null)
                    return "Inventories (" + this.Items.Count() + ")";
                return "Inventories";
            }
        }

        protected override IQueryDefinition ViewQuery
        {
            get
            {
                if (_queryDefinition == null)
                    _queryDefinition = new ItemQueryDefinition();
                return _queryDefinition;
            }
        }

        private bool CanExecuteLoadIncrementalCommand(object paramater)
        {
            return this.EnableIncrementalLoading;
        }

        private void ExecuteLoadIncrementalCommand(object parameter)
        {
            LoadDataIncremental();
        }
    }
}