async where linq
static async Task<IEnumerable<T>> Where<T>(
this IEnumerable<T> source, Func<T, Task<bool>> predicate)
{
var results = new ConcurrentQueue<T>();
var tasks = source.Select(
async x =>
{
if (await predicate(x))
results.Enqueue(x);
});
await Task.WhenAll(tasks);
return results;
}
var filteredAddresses = await addresses.Where(MeetsCriteria);