public async Task <IValueProvider> BindAsync(IStorageTable value, ValueBindingContext context)
{
IQueryable <TElement> queryable;
if (!await value.ExistsAsync(context.CancellationToken))
{
queryable = Enumerable.Empty <TElement>().AsQueryable();
}
else
{
queryable = value.CreateQuery <TElement>();
}
return(new TableValueProvider(value, queryable, typeof(IQueryable <TElement>)));
}
public async Task <IQueryable <TElement> > ConvertAsync(IStorageTable value, CancellationToken cancellation)
{
// If Table does not exist, treat it like have zero rows.
// This means return an non-null but empty enumerable.
// SDK doesn't do that, so we need to explicitly check.
bool exists = await value.ExistsAsync(CancellationToken.None);
if (!exists)
{
return(Enumerable.Empty <TElement>().AsQueryable());
}
else
{
return(value.CreateQuery <TElement>());
}
}
