在C＃中的Windows Phone 7洗牌字符串列表 [英] Shuffling string list in C# Windows phone 7

问题描述

我到处找关于如何随机播放/随机字符串列表在C＃中为Windows Phone 7，我还是可以这么说这可能是我的出路联赛初学者，但我正在写一个简单的应用程序，这是它的基础。我有我需要重新洗牌，并输出到一个文本块字符串列表。我有位和codeS，我抬头一看片，但我知道我有错。有什么建议？

I've looked everywhere on how to shuffle/randomize a string list in C# for the windows phone 7. I'm still a beginner you could say so this is probably way out of my league, but I'm writing a simple app, and this is the base of it. I have a list of strings that I need to shuffle and output to a text block. I have bits and pieces of codes I've looked up, but I know I have it wrong. Any suggestions?

推荐答案

的费雪耶茨-Durstenfeld洗牌是一个成熟的技术，很容易实现。下面是可以在任何的IList＆LT执行就地洗牌的扩展方法; T＆GT;

The Fisher-Yates-Durstenfeld shuffle is a proven technique that's easy to implement. Here's an extension method that will perform an in-place shuffle on any IList<T>.

（这应该很容易，如果你决定要离开原来的完整列表，并返回一个新的适应，洗牌列表，而不是，或<一个href=\"http://stackoverflow.com/questions/1651619/optimal-linq-query-to-get-a-random-sub-collection-shuffle/1653204#1653204\">act在的IEnumerable＆LT; T＆GT; 序列，点菜LINQ）

(It should be easy enough to adapt if you decide that you want to leave the original list intact and return a new, shuffled list instead, or to act on IEnumerable<T> sequences, à la LINQ.)

var list = new List<string> { "the", "quick", "brown", "fox" };
list.ShuffleInPlace();

// ...

public static class ListExtensions
{
    public static void ShuffleInPlace<T>(this IList<T> source)
    {
        source.ShuffleInPlace(new Random());
    }

    public static void ShuffleInPlace<T>(this IList<T> source, Random rng)
    {
        if (source == null) throw new ArgumentNullException("source");
        if (rng == null) throw new ArgumentNullException("rng");

        for (int i = 0; i < source.Count - 1; i++)
        {
            int j = rng.Next(i, source.Count);

            T temp = source[j];
            source[j] = source[i];
            source[i] = temp;
        }
    }
}

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