public async Task <IEnumerable <UserProfile> > GetAllAsync()
{
if (allItemsLoaded)
{
return(cachedUserProfiles.Values);
}
var items = await dataApiClient.GetAllUserProfiles();
items
.Where(item => !cachedUserProfiles.ContainsKey(item.Username))
.ForEach(item => cachedUserProfiles.Add(item.Username, item));
allItemsLoaded = true;
return(items);
}