public class RandomStringBuilder
{/// <summary>/// 生成单个随机数字/// </summary>private int createNum(){Random random = new Random(Guid.NewGuid().GetHashCode());int num = random.Next(10);return num;}/// <summary>/// 生成单个大写随机字母/// </summary>private string createBigAbc(){//A-Z的 ASCII值为65-90Random random = new Random(Guid.NewGuid().GetHashCode());int num = random.Next(65, 91);string abc = Convert.ToChar(num).ToString();return abc;}/// <summary>/// 生成单个小写随机字母/// </summary>private string createSmallAbc(){//a-z的 ASCII值为97-122Random random = new Random(Guid.NewGuid().GetHashCode());int num = random.Next(97, 123);string abc = Convert.ToChar(num).ToString();return abc;}/// <summary>/// 生成随机字符串/// </summary>/// <param name="length">字符串的长度</param>/// <returns></returns>public string Create(int length){// 创建一个StringBuilder对象存储密码StringBuilder sb = new StringBuilder();//使用for循环把单个字符填充进StringBuilder对象里面变成14位密码字符串for (int i = 0; i < length; i++){Random random = new Random(Guid.NewGuid().GetHashCode());//随机选择里面其中的一种字符生成switch (random.Next(3)){case 0://调用生成生成随机数字的方法sb.Append(createNum());break;case 1://调用生成生成随机小写字母的方法sb.Append(createSmallAbc());break;case 2://调用生成生成随机大写字母的方法sb.Append(createBigAbc());break;}}return sb.ToString();}
}