最好的办法种子随机（）的单 [英] Best way to seed Random() in singleton

问题描述

我在需要使用.NET系统中的单例类的方法。 随机（），因为该方法被调用在多线程环境下，我不能创建它只有一次，静态地声明它，但是我必须创建一个随机（）对象中的每个方法被调用的时间。由于随机（）默认种子是基于时钟滴答它不是我的塞纳里奥足够随机的。为了创造更加美好的种子我已研究过几种方法，并想出下面一个是最好的，但也有可能是其他（更快/更好），这样做的方式，我想知道的。

 随机RND =新的随机（BitConverter.ToInt32（Guid.NewGuid（）的toByteArray（），0））;
 

解决方案

而不是试图想出一个更好的种子自己时，使用<一个href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.randomnumbergenerator.aspx">System.Security.Cryptography.RandomNumberGenerator.

有使用基于一个复杂的算法，它涉及到许多不同的环境变量的种子。系统时间就是其中之一，因为是IIRC你的网卡等的MAC地址。

这也被认为是一个更随意的算法比Random类实现的人。

I have a method in a singleton class that need to use the .NET System. Random(), since the method is called in a multi-threaded environment I can't create it only once and declare it statically, but I have to create a Random() object each time the method is called. Since Random() default seed is based on the clock ticks it is not random enough in my senario. To create a better seed I have looked into several methods and have figured the following one is the best, but there may be other (faster/better) ways of doing this that I would like to know about.

Random rnd = new Random(BitConverter.ToInt32(Guid.NewGuid().ToByteArray(), 0));

解决方案

Instead of trying to come up with a better seed yourself, use System.Security.Cryptography.RandomNumberGenerator.

It uses a seed based on a complex algorithm that involves a lot of different environment variables. System time is one of those, as is IIRC the MAC address of your NIC, etc.

It is also considered a 'more random' algorithm than the one implemented by the Random class.

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