c# 自定義位數生成激活碼

Random random = new Random(~unchecked((int)DateTime.Now.Ticks));PRivate string CreateAndCheckCode(Random random, string code, int length) // code 激活碼前綴 {

char[] Pattern = new char[] { '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' }; string result = code; int n = Pattern.Length; for (int i = 0; i < length; i++) { int rnd = random.Next(0, n); result += Pattern[rnd]; }if (數據庫中不存在) { return result; } else { return CreateAndCheckCode(random, code, length); } }