定义随机数：产生1到9之间的数字-->
Random ran=new Random(); int RNum=ran.Next(1,10);
范例1：针对键盘随机数的产生-->
private static char[] keyPressNum = { '0','1','2','3','4','5','6','7','8','9', 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z', 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' }; public static string GenerateRandomNumber(int Length) { System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62); Random rd = new Random(); for (int i = 0; i < Length; i++) { newRandom.Append(keyPressNum[rd.Next(62)]); } return newRandom.ToString(); }
范例2：定义一数组，并产生不重复的随机数-->
public int[] getRandomNum(int num, int minValue, int maxValue) { Random ra = new Random(); int[] arrNum = new int[num]; int tmp = 0; for (int i = 0; i < num ; i++) { tmp = ra.Next(minValue, maxValue); //随机取数 arrNum[i] = getNum(arrNum, tmp, minValue, maxValue, ra); //取出值赋到数组中 } return arrNum; } public int getNum(int[] arrNum, int tmp, int minValue, int maxValue, Random ra) { int n = 0; while (n < arrNum.Length) { 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; }
