关于随机y线程的问题 [英] Question about Random y Threads

问题描述

我有个问题:

我有一个A类，其中有一个静态属性Random.在另一个类B中，有一个线程使用A的随机数来确定B类实例应朝哪个方向旋转，从而在整个画布上产生随机运动.问题是 一段时间后(B的实例越多，发生的越早)，B的所有实例开始旋转一个小圈.就像A.random的预想值已经结束，并且它向B的所有实例返回相同的值.

I've a class A, wich have an static attribute Random. In another class B, there is a thread that uses A's random to decide in which direction the instance of the B class should turn, generating a random movement throughout the canvas. The problem is that after a while (the more instances of B, the sooner it happens) all the instances of B begin to spin in little circles. It's like the aleatory values of A.random are over, and it returns the same value to all the instances of B.

解决此问题的一种非常简单的方法是为B的每个实例创建一个新的随机变量，但是我想知道为什么会这样.

A very simple way to fix this is to create a new random variable to each instance of B, but I'd like to know why is this happening.

希望得到答案，谢谢.

MigueloH

推荐答案

使用时钟初始化随机类，这意味着如果您同时创建多个实例， (或几乎相同)的时间，例如在一个循环中，您可能会得到相同的随机"时间.价值观.

The Random class is initialized using the clock and this means that if you create several instances of it at the same (or nearly the same) time, for example in a loop, you may get the same "random" values.

解决方案是使用Random类的 same 实例生成 所有随机数.除了在类的每个实例中创建新的Random对象之外，您还可以创建一个静态的应用程序范围的类，该类返回将由所有类使用的同一Random对象:

The solution is to use the same instance of the Random class to generate all random numbers. Instead of creating a new Random object in each instance of your class, you could perhaps create a static application-wide class that returns the same Random object to be used by all classes:

  public static class ApplicationService
  {

    private static Random _random = new Random();

    public static Random Random {
      get {
        return _random;
      }
    }
  }

public class A
{
void SomeMethodA()
{
 Random random = ApplicationService.Random; //use this one
}
}

public class B
{
void SomeMethodB()
{
 Random random = ApplicationService.Random; //use this one
}
}

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