public Task <IEnumerable <T> > LoadAsync(TKey key)
{
lock (_cache)
{
// Get value from the cache if it's there
if (_cache.TryGetValue(key, out var value))
{
return(Task.FromResult(value));
}
// Otherwise add to pending keys
_pendingKeys.Add(key);
}
// Return task which will complete when this loader is dispatched
return(DataLoaded.ContinueWith(task => task.Result[key],
TaskContinuationOptions.OnlyOnRanToCompletion));
}