1.生成随机字母字符串(数字字母混和)
/// 生成随机字母字符串(数字字母混和) /// /// 待生成的位数 /// 生成的字母字符串 private string GenerateCheckCode(int codeCount) { int rep = 0; string str = string.Empty; long num2 = DateTime.Now.Ticks + rep; rep++; Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> rep))); for (int i = 0; i < codeCount; i++) { char ch; int num = random.Next(); if ((num % 2) == 0) { ch = (char)(0x30 + ((ushort)(num % 10))); } else { ch = (char)(0x41 + ((ushort)(num % 0x1a))); } str = str + ch.ToString(); } return str; }