private void OnDeleteCommand(object obj)
        {
            if (IsLoading)
            {
                ToastHelper.ShowMessage("加载中,请稍后");
                return;
            }
            var localItem = obj as LocalBookItemViewModel;

            if (localItem == null)
            {
                return;
            }
            IsLoading = true;

            Task.Run(() =>
            {
                var reslut = DbLocalBook.DeleteBook(AppDataPath.GetLocalBookDbPath(),
                                                    localItem.CurrentBook.BookId);

                DispatcherHelper.CheckBeginInvokeOnUI(() =>
                {
                    if (!reslut)
                    {
                        ToastHelper.ShowMessage($"{localItem.CurrentBook.BookName}删除失败,请重试", false);
                        return;
                    }
                    localItem.IsDeleted = true;
                    LocalBooks.Remove(localItem);
                    IsLoading = false;
                });
            });
        }
        public void InserOrUpdateBook(Book book)
        {
            if (book == null)
            {
                return;
            }

            var temp = LocalBooks.FirstOrDefault(p => p.CurrentBook.BookId == book.BookId);

            DbLocalBook.InsertOrUpdatBook(AppDataPath.GetLocalBookDbPath(), book);

            DispatcherHelper.CheckBeginInvokeOnUI(() =>
            {
                if (temp != null)
                {
                    LocalBooks.Remove(temp);
                }
                LocalBooks.Insert(0, new LocalBookItemViewModel(book));
            });

            if (!IsInit)
            {
                GetLocalBookFromDb();
            }
        }