产生随机数

本是古典何须时尚 2021-10-25 12:09 486阅读 0赞

public const int Num = 50000;         //数目
    public const int MaxValue = 880296;   //最大数
    public const int MinValue = 1;    //最小数
    
    
    #region  产生随机数部分
            /// <summary>
            /// 随机数进行排序
            /// </summary>
            public int[] sort(int[] num)
            {
                int i, j, temp;
                int n = num.Length;
                for (i = 0; i < n - 1; i++)
                {
                    for (j = i + 1; j < n; j++) /*注意循环的上下限*/
                    {
                        if (num[i] > num[j])
                        {
                            temp = num[i];
                            num[i] = num[j];
                            num[j] = temp;
                        }
                    }
                }
                return num;
            }
            /// <summary>
            /// 判断随机数是否重复
            /// </summary>
            public int getNum(int[] arrNum, int tmp, int minValue, int maxValue, Random ra)
            {
                int n = 0;
                while (n <= arrNum.Length - 1)
                {
                    if (arrNum[n] == tmp) //利用循环判断是否有重复
                    {
                        tmp = ra.Next(minValue, maxValue); //重新随机获取。
                        getNum(arrNum, tmp, minValue, maxValue, ra);//递归:如果取出来的数字和已取得的数字有重复就重新随机获取。
                    }
                    n++;
                }
                return tmp;
            }
            /// <summary>
            /// 获取随机数
            /// </summary>
            public Collection<long> getRandomNum(int num, int minValue, int maxValue)
            {
                Random ra = new Random(unchecked((int)DateTime.Now.Ticks));
                Collection<long> strNum = new Collection<long>();
                int[] arrNum = new int[num];
                int tmp = 0;
    
                for (int i = 0; i <= num - 1; i++)
                {
                    tmp = ra.Next(minValue, maxValue); //随机取数
                    Console.WriteLine("排序前的：" + tmp);
                    arrNum[i] = getNum(arrNum, tmp, minValue, maxValue, ra); //取出值赋到数组中
                }
    
                this.sort(arrNum);
                string RandomNum = "RandomNum.txt";
                for (int i = 0; i < arrNum.Length; i++)
                {
                    string s = Convert.ToString(arrNum[i]);
                    Console.WriteLine("排序后的：" + s);
                    using (FileStream fst1 = new FileStream(RandomNum, FileMode.Append))
                    {
                        using (System.IO.StreamWriter _writer1 = new System.IO.StreamWriter(fst1))
                        {
                            _writer1.WriteLine("RowId = " + s);
                            _writer1.Close();
                            fst1.Close();
                        }
                    }
                    strNum.Add(Convert.ToInt64(s));
                }
                return strNum;
            }
            #endregion
    
    
      //调用中……
    
      ParserStatuteByLawCase RandomStatuteId = new ParserStatuteByLawCase();
       RandomStatuteId.getRandomNum(10000, 0, 700000);

转载于:https://www.cnblogs.com/-ShiL/archive/2011/05/11/2011\_05\_11\_13\_20.html