private void ExecuteProcessNumberSieveCommand()
{
// reset display
LoadNumbers();
// disable process button
DispatchService.Invoke(() => IsNotBusy = false);
// perform sieve in background thread
DispatchService.Background(() =>
{
const int interval = 100;
var max = _numbers.Count + 1;
for (var i = 2; i <= max; i++)
{
// delay
System.Threading.Thread.Sleep(interval);
// adjust for collection starting at 2
var index = i - 2;
var number = i;
// See if i is prime.
if (!PrimeNumberService.IsPrimeNumber(number))
{
continue;
}
// mark as prime
_numbers[index].IsPrime = true;
_numbers[index].DisplayColor = ColorService.PrimeColor;
// Knock out multiples of number
var backgroundColor = ColorService.GetNextColor();
for (var j = number * number; j <= max; j += number)
{
_numbers[j - 2].IsPrime = false;
_numbers[j - 2].Model.DisplayColor = backgroundColor;
// delay
System.Threading.Thread.Sleep(interval);
}
}
// re-enable button
DispatchService.Invoke(() => IsNotBusy = true);
});
}