用于C#的快速线程安全随机数生成器 [英] Fast thread-safe random number generator for C#

问题描述

我需要在多个运行线程中快速生成随机浮点数.我尝试使用System.Random，但是对于我的需求来说太慢了，并且它在多个线程中返回相同的数字. (当我在单个线程中运行应用程序时，它可以很好地工作.)此外，我需要确保生成的数字在0到100之间.

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 returns the same number across multiple threads. (It works fine when I run my application in a single thread.) Also, I need to make sure the generated numbers are between 0 and 100.

这就是我现在正在尝试的内容:

Here's what I'm trying now:

number = random.NextDouble() * 100;

我应该怎么做?

推荐答案

这是我的看法(需要.net 4.0):

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();
    }
}

进行测试以检查1000次迭代中每个值是否唯一:

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<double>();

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

        CollectionAssert.AllItemsAreUnique(collection);
    }
}

我不保证它永远不会返回重复的值，但是我已经运行了10000次迭代并通过了测试.

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.

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