// Fetches the last chat conversation items from the cloud to be displayed on screen
private async void RefreshChatItems()
{
prgBusy.IsActive = true;
if (isLoggedin)
{
MobileServiceInvalidOperationException exception = null;
try
{
// The max number of items to retrieve from Azure Mobile Services
// Note that N CANNOT be greater than 50, we'd have to use paging for more
int n = 20;
// This code refreshes the entries in the list view by querying the ChatItems table.
// We only want the last N members, so we have to sort by descending order and request the first N
items = await chatTable.OrderByDescending(chatitem => chatitem.TimeStamp).Take(n).ToCollectionAsync();
// But now we need to reverse the order again so the last item is always at the bottom of the list, not the top
// Unfortunately, both of these methods are unsupported on a Mobile Service Collection
// items.Reverse<ChatItem>();
// items.OrderBy(chatitem => chatitem.TimeStamp);
// Let's get creative and manually invert the order of the items by moving them one by one
// Since there cannot be more than 50 items, this is not an unreasonable technique to use
if (items.Count > 0)
{
if (items.Count < n)
{
n = items.Count;
}
for (int i = 0; i < (n - 1); i++)
{
items.Move(0, n - i - 1);
}
}
items.CollectionChanged += (s, args) => ScrollDown();
ScrollDown();
}
catch (MobileServiceInvalidOperationException e)
{
exception = e;
}
if (exception != null)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
new MessageDialog(exception.Message, "Error loading items").ShowAsync();
});
}
else
{
ListItems.ItemsSource = items;
}
}
prgBusy.IsActive = false;
}
// Fetches the last chat conversation items from the cloud to be displayed on screen
private async void RefreshChatItems()
{
prgBusy.IsActive = true;
if (isLoggedin)
{
MobileServiceInvalidOperationException exception = null;
try
{
// The max number of items to retrieve from Azure Mobile Services
int n = 30;
// refreshes the entries in the list view by querying the ChatItems table.
items = await chatTable.OrderByDescending(chatitem => chatitem.TimeStamp).Take(n).ToCollectionAsync();
// reverse the order again so the last item is always at the bottom of the list, not the top
if (items.Count > 0)
{
if (items.Count < n)
{
n = items.Count;
}
for (int i = 0; i < (n - 1); i++)
{
items.Move(0, n - i - 1);
}
}
ScrollDown();
}
catch (MobileServiceInvalidOperationException e)
{
exception = e;
}
if (exception != null)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
new MessageDialog(exception.Message, "Error loading items").ShowAsync();
});
}
else
{
ListItems.ItemsSource = items;
//lastCount = items.Count;
ScrollDown();
}
}
prgBusy.IsActive = false;
}
// Obtiene los últimos mensajes de la conversación desde la nube para mostrarlos en la pantalla
private async void RefreshChatItems()
{
prgBusy.IsActive = true;
if (isLoggedin)
{
MobileServiceInvalidOperationException exception = null;
try
{
int n = 20;
items = await chatTable.OrderByDescending(chatitem => chatitem.TimeStamp).Take(n).ToCollectionAsync();
if (items.Count > 0)
{
if (items.Count < n)
{
n = items.Count;
}
for (int i = 0; i < (n - 1); i++)
{
items.Move(0, n - i - 1);
}
}
}
catch (MobileServiceInvalidOperationException e)
{
exception = e;
}
if (exception != null)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
new MessageDialog(exception.Message, "Error cargando los mensajes").ShowAsync();
});
}
else
{
ListItems.ItemsSource = items;
}
}
prgBusy.IsActive = false;
}
// Fetches the last chat conversation items from the cloud to be displayed on screen
private async void RefreshChatItems()
{
prgBusy.IsActive = true;
if (isLoggedin)
{
MobileServiceInvalidOperationException exception = null;
try
{
// The max number of items to retrieve from Azure Mobile Services
// Note that N CANNOT be greater than 50, we'd have to use paging for more
int n = 20;
// This code refreshes the entries in the list view by querying the ChatItems table.
// We only want the last N members, so we have to sort by descending order and request the first N
items = await chatTable.OrderByDescending(chatitem => chatitem.TimeStamp).Take(n).ToCollectionAsync();
// But now we need to reverse the order again so the last item is always at the bottom of the list, not the top
// Unfortunately, both of these methods are unsupported on a Mobile Service Collection
// items.Reverse<ChatItem>();
// items.OrderBy(chatitem => chatitem.TimeStamp);
// Let's get creative and manually invert the order of the items by moving them one by one
// Since there cannot be more than 50 items, this is not an unreasonable technique to use
if (items.Count > 0)
{
if (items.Count < n) { n = items.Count; }
for (int i = 0; i < (n - 1); i++)
{
items.Move(0, n - i - 1);
}
}
items.CollectionChanged += (s, args) => ScrollDown();
ScrollDown();
}
catch (MobileServiceInvalidOperationException e)
{
exception = e;
}
if (exception != null)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
new MessageDialog(exception.Message, "Error loading items").ShowAsync();
});
}
else
{
ListItems.ItemsSource = items;
}
}
prgBusy.IsActive = false;
}