public Task <List <User> > CheckUsersInGroupPresence(GroupChannel channel)
{
var tcs = new TaskCompletionSource <List <User> >();
if (channel == null)
{
tcs.TrySetCanceled();
return(tcs.Task);
}
channel.Refresh((e) =>
{
if (e != null)
{
tcs.TrySetCanceled();
}
else
{
tcs.TrySetResult(channel.Members);
}
});
Debug.WriteLine("UpdateUsers Presence");
return(tcs.Task);
}