Question

My app makes a simple call the an Azure Webservice database and I want to copy the returned rows into a new list.

private IMobileServiceTable<dbEntry> entryTable = App.MobileService.GetTable<dbEntry>();
private MobileServiceCollectionView<dbEntry> currentEntries;

currentEntries = (entryTable.Where(ev => ev.event_date.Month == dateToShow.Month)
            .ToCollectionView());

foreach (dbEntry ev in currentEntries)
{
    //insert ev into another List
}

The problem is that the “where” call to the DB is asynchronous, so by the time the loop is reached there are no elements in currentEntries yet.

How can I detect that the call has completed before executing the loop? Is there an event handler for this?

Thank you.

Answer 1

It sounds like you found this solution already but I’ll post it for anyone else that comes across this.

Unless you directly want to bind a UI element to the results of the operation, I suggest you do not use the ToCollectionView method. Instead, do the following:

private IMobileServiceTable<dbEntry> entryTable = App.MobileService.GetTable<dbEntry>();
private List<dbEntry> currentEntries;

currentEntries = await entryTable.Where(ev => ev.event_date.Month == dateToShow.Month)
   .ToListAsync();

foreach (dbEntry ev in currentEntries)
{
    //insert ev into another List
}