public async Task InsertTodoItemAsync (ToDoItem todoItem)
{
try {
// This code inserts a new TodoItem into the database. When the operation completes
// and Mobile Services has assigned an Id, the item is added to the CollectionView
await todoTable.InsertAsync (todoItem);
Items.Add (todoItem);
} catch (MobileServiceInvalidOperationException e) {
Console.Error.WriteLine (@"ERROR {0}", e.Message);
}
}
public async Task CompleteItemAsync (ToDoItem item)
{
try {
// This code takes a freshly completed TodoItem and updates the database. When the MobileService
// responds, the item is removed from the list
item.Complete = true;
await todoTable.UpdateAsync (item);
Items.Remove (item);
} catch (MobileServiceInvalidOperationException e) {
Console.Error.WriteLine (@"ERROR {0}", e.Message);
}
}
private async Task<int> ShowConflictDialog(ToDoItem localItem, JObject serverValue)
{
var dialog = new UIAlertView("Conflict between local and server versions",
"How do you want to resolve this conflict?\n\n" + "Local item: \n" + localItem +
"\n\nServer item:\n" + serverValue.ToObject<ToDoItem>(), null, "Cancel", LOCAL_VERSION, SERVER_VERSION);
var clickTask = new TaskCompletionSource<int>();
dialog.Clicked += (sender, e) =>
{
clickTask.SetResult(e.ButtonIndex);
};
dialog.Show();
return await clickTask.Task;
}
async partial void OnAdd (NSObject sender)
{
if (string.IsNullOrWhiteSpace (itemText.Text))
return;
var newItem = new ToDoItem {
Text = itemText.Text,
Complete = false
};
await todoService.InsertTodoItemAsync (newItem);
var index = todoService.Items.FindIndex (item => item.Id == newItem.Id);
TableView.InsertRows (new [] { NSIndexPath.FromItemSection (index, 0) },
UITableViewRowAnimation.Top);
itemText.Text = "";
}