一個隨機數類

       本類思想：高性能計數器以微妙級累加數值，逢十進位。如果動態的單看數值最後一個數字，一定是在0-9之間不斷旋轉，就像一個滾動的俄羅斯輪盤，暫停時一定指向其中某一位數字並且指向哪個數字是不可預測的，當暫停次數足夠多時，分佈在各個數值上的概率無限接近。

using System.Runtime.InteropServices;

namespace SuiJiShu
{
    /// <summary>
    /// 隨機數生成器
    /// </summary>
    public class SuiJiShuShengChengQi
    {
        //獲取高性能計數器數值
        [DllImport("kernel32.dll")]
        extern static short QueryPerformanceCounter(ref long x);

        /// <summary>
        /// 十以內隨機數
        /// </summary>
        /// <returns></returns>
        public int ShiYiNeiSuiJiShu()
        {
            long _dangQianJiShuQiZhi = 0;
            QueryPerformanceCounter(ref _dangQianJiShuQiZhi);

            string _dangQianJiShuQiZhiString = _dangQianJiShuQiZhi.ToString();
            return int.Parse(_dangQianJiShuQiZhiString.Remove(0, _dangQianJiShuQiZhiString.Length - 1));
        }
        /// <summary>
        /// 百以內隨機數
        /// </summary>
        /// <returns></returns>
        public int BaiYiNeiSuiJiShu()
        {
            long _dangQianJiShuQiZhi = 0;
            QueryPerformanceCounter(ref _dangQianJiShuQiZhi);

            string _dangQianJiShuQiZhiString = _dangQianJiShuQiZhi.ToString();
            return int.Parse(_dangQianJiShuQiZhiString.Remove(0, _dangQianJiShuQiZhiString.Length - 2));
        }
        /// <summary>
        /// 千以內隨機數
        /// </summary>
        /// <returns></returns>
        public int QianYiNeiSuiJiShu()
        {
            long _dangQianJiShuQiZhi = 0;
            QueryPerformanceCounter(ref _dangQianJiShuQiZhi);

            string _dangQianJiShuQiZhiString = _dangQianJiShuQiZhi.ToString();
            return int.Parse(_dangQianJiShuQiZhiString.Remove(0, _dangQianJiShuQiZhiString.Length - 3));
        }
    }
}

//ShiYiNeiSuiJiShu運行一百萬次數值分佈：
0:97872
1:100082
2:100237
3:99895
4:100556
5:99995
6:100384
7:99928
8:100339
9:100712

//測試代碼
Dictionary<int, List<int>> _tongJiZiDian = new Dictionary<int, List<int>>();
for (int i = 0; i < 10; i++)
{
    _tongJiZiDian.Add(i, new List<int>());
}

SuiJiShuShengChengQi _SuiJiShuShengChengQi = new SuiJiShuShengChengQi();
for (int i = 0; i < 1000000; i++)
{
   int _suiJiShu = _SuiJiShuShengChengQi.ShiYiNeiSuiJiShu();
   _tongJiZiDian[_suiJiShu].Add(_suiJiShu);
}

StringBuilder _sss = new StringBuilder();
foreach (KeyValuePair<int, List<int>> key in _tongJiZiDian)
{
  _sss.Append(key.Key.ToString() + ":" + key.Value.Count.ToString() + "\r\n");
}   

寫作時間：2018-11-07

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