对字符串数组生成一个随机序

这种情况： 一组照片，或者MP3歌曲，知道它们的路径，保存在一个数组中。现在想随机播放之。要求，每首歌出现的概率相等，且播放完全部之前不会重复，并且保证顺序可以前后无限快进或者快倒。

using System; using System.Collections.Generic; using System.Text; using System.IO;

namespace RandomStringArray { class Program { private static int count = 50;

    static void Main(string[] args)
    {
        string[] originalArray = GetStringArray();
        string[] randomArray = new string;

        SortedList<int, string> list = new SortedList<int, string>();
        for (int i = 0; i < originalArray.Length; i++)
        {
            list.Add(originalArray.GetHashCode(), originalArray);
        }

        int index = 0;
        foreach (KeyValuePair<int, string> item in list)
        {
            randomArray = item.Value;
        }

        // Print Result
        Console.WriteLine("Original:");
        for (int i = 0; i < originalArray.Length; i++)
        {
            Console.WriteLine(string.Format("[{0}]{1}", i, originalArray));
        }
        Console.WriteLine("Random:");
        for (int i = 0; i < randomArray.Length; i++)
        {
            Console.WriteLine(string.Format("[{0}]{1}", i, randomArray));
        }
    }

    ///
    /// Generate a directories list for test
    ///
    /// <returns>Directories list</returns>
    private static string[] GetStringArray()
    {
        if (!Directory.Exists("Temp"))
        {
            Directory.CreateDirectory("Temp");

            for (int i = 0; i < count; i++)
            {
                Directory.CreateDirectory("Temp\\" +
                            Guid.NewGuid().ToString());
            }
        }
        return Directory.GetDirectories("Temp");
    }
}

}