private async void downloadItemList()
{
var serverDb = new ServerDatabaseService();
List <Models.Item> itemList = new List <Models.Item>();
if (ItemCatalogue == null)
{
ItemCatalogue = new ObservableCollection <SalesItemSelection>();
}
Models.Item temp;
foreach (SalesItemSelection item in ItemCatalogue)
{
temp = new Models.Item(item.ItemId, item.Name, item.Price, item.UnitMeasurement, item.Barcode);
itemList.Add(temp);
}
var fetchedItem = await serverDb.getAllItems();
if (fetchedItem != null)
{
//compare with local
List <Models.Item> fetchedData = new List <Models.Item>(fetchedItem);
List <Models.Item> newData = fetchedData.Except(itemList).ToList();
List <Models.Item> deletedData = itemList.Except(fetchedData).ToList();
if (newData != null)
{
//insert new data to local db
await itemDb.InsertItems(new ObservableCollection <Models.Item>(newData));
}
if (deletedData != null)
{
//delete deleted data in local db
foreach (Models.Item data in deletedData)
{
await itemDb.DeleteItem(data);
}
}
loadItemCatalogue();
}
}