C＃，Random.Next的奇怪之处

Question

我有一个蜗牛课。

    class snails
{
    Random speedRand = new Random();
    public int SnaleOffset = 9;
    int speed;
    public void snailChangeSpeed() { this.speed = speedRand.Next(3)+1; }
    public void snailGo() { this.SnaleOffset = this.SnaleOffset + this.speed; }
}

我创建了4个蜗牛对象，当timerSnailSpeed计时器滴答时，它们会改变它们的移动速度......

        private void timerSnailSpeed_Tick(object sender, EventArgs e)
    {
        Snail1.snailChangeSpeed();
        Snail2.snailChangeSpeed();
        Snail3.snailChangeSpeed();
        Snail4.snailChangeSpeed();

    private void timerSnailMove_Tick(object sender, EventArgs e)
    {
        Snail1.snailGo();
        Snail2.snailGo();
        Snail3.snailGo();
        Snail4.snailGo();
        imgSnail1.Left = Snail1.SnaleOffset;
        imgSnail2.Left = Snail2.SnaleOffset;
        imgSnail3.Left = Snail3.SnaleOffset;
        imgSnail4.Left = Snail4.SnaleOffset;
    }

然而问题是，它们的速度不会随机变化为每个蜗牛对象，而是随后所有蜗牛对象的速度。有什么想法吗？

谢谢！

Answer 1

您正在创建Random的四个实例，并且由于默认种子是基于时间的，因此它们很可能都会产生相同的随机数序列。让snails的实例共享同一个Random实例以避免这种情况。