Fast thread-safe random number generator for C#

Question

I need to quickly generate random floating-point numbers across multiple running threads. I\'ve tried using System.Random, but it\'s too slow for my needs and it re

Answer 1

Here is my take on it (requires .net 4.0):

public static class RandomGenerator
{
    private static object locker = new object();
    private static Random seedGenerator = new Random(Environment.TickCount);

    public static double GetRandomNumber()
    {
        int seed;

        lock (locker)
        {
            seed = seedGenerator.Next(int.MinValue, int.MaxValue);
        }

        var random = new Random(seed);

        return random.NextDouble();
    }
}

and a test to check that for 1000 iterations each value is unique:

[TestFixture]
public class RandomGeneratorTests
{
    [Test]
    public void GetRandomNumber()
    {
        var collection = new BlockingCollection();

        Parallel.ForEach(Enumerable.Range(0, 1000), i =>
        {
            var random = RandomGenerator.GetRandomNumber();
            collection.Add(random);
        });

        CollectionAssert.AllItemsAreUnique(collection);
    }
}

I don't guarantee that it will never return a duplicate value, but I've run the test with 10000 iterations and it passed the test.