public static List <long> GetPrimesParallel(long first, long last)
{
var lockObject = new object();
IEnumerable <long> result = new List <long>();
Parallel.ForEach(
Partitioner.Create(first, last),
() => new List <long>(),
(range, loopState, partialResult) =>
{
for (long i = range.Item1; i < range.Item2; i++)
{
if (PrimeTool.IsPrime(i))
{
partialResult.Add(i);
}
}
return(partialResult);
},
(partialResult) =>
{
lock (lockObject)
{
result = result.Concat(partialResult);
}
}
);
return(result.OrderBy(s => s).ToList());
}
