RandomHelper-随机数辅助类代码,CSharp代码库,德仔网

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【CSharp】 RandomHelper-随机数辅助类
作者:汉妤 / 发布于2016/1/4/ 1390

	namespace Framework
	{
	 using System;
	 using System.Globalization;
	 using System.Text;
	
	 /// <summary>
	 /// 随机数辅助类
	 /// </summary>
	 public sealed class RandomHelper
	 {
	 private static readonly char[] RandChar = { '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' };
	 private static Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
	 private static int seed = 1;
	
	 private RandomHelper()
	 {
	 }
	
	 /// <summary>
	 /// 根据规则随机生成字符串
	 /// </summary>
	 /// <param name="pattern">样式："?"代表一个字符，"#"代表一个一位数字，"*"代表一个字符串或一个一位数字</param>
	 /// <returns>随机字符串</returns>
	 public static string GetRandStringByPattern(string pattern)
	 {
	 if (!pattern.Contains("#") && !pattern.Contains("?") && !pattern.Contains("*"))
	 {
	 return pattern;
	 }
	
	 char[] nums = pattern.ToCharArray();
	 StringBuilder sb = new StringBuilder();
	 for (int i = 0; i < nums.Length; i++)
	 {
	 switch (nums[i])
	 {
	 case '?':
	 nums[i] = RandChar[rand.Next(10, 62)];
	 break;
	 case '#':
	 nums[i] = RandChar[rand.Next(0, 10)];
	 break;
	 case '*':
	 nums[i] = RandChar[rand.Next(62)];
	 break;
	 default:
	 break;
	 }
	
	 sb.Append(nums[i]);
	 }
	
	 return sb.ToString();
	 }
	
	 /// <summary>
	 /// 生成随机的数值
	 /// </summary>
	 /// <param name="min">随机数可取该下界值</param>
	 /// <param name="max">随机数的上界</param>
	 /// <returns>随机的数值</returns>
	 public static int GetFormatedNumeric(int min, int max)
	 {
	 int num = 0;
	 Random ro = new Random(unchecked(seed * (int)DateTime.Now.Ticks));
	 num = ro.Next(min, max);
	 seed++;
	 return num;
	 }
	
	 /// <summary>
	 /// 获取指定长度和字符的随机字符串
	 /// 通过调用 Random 类的 Next() 方法，先获得一个大于或等于 0 而小于 pwdchars 长度的整数
	 /// 以该数作为索引值，从可用字符串中随机取字符，以指定的密码长度为循环次数
	 /// 依次连接取得的字符，最后即得到所需的随机密码串了。
	 /// </summary>
	 /// <param name="pwdchars">随机字符串里包含的字符</param>
	 /// <param name="pwdlen">随机字符串的长度</param>
	 /// <returns>随机产生的字符串</returns>
	 public static string GetRandomString(string pwdchars, int pwdlen)
	 {
	 StringBuilder tmpstr = new StringBuilder();
	 int randNum;
	
	 for (int i = 0; i < pwdlen; i++)
	 {
	 randNum = rand.Next(pwdchars.Length);
	 tmpstr.Append(pwdchars[randNum]);
	 }
	
	 return tmpstr.ToString();
	 }
	
	 /// <summary>
	 /// 获取指定长度的随机字符串
	 /// </summary>
	 /// <param name="pwdlen">随机字符串的长度</param>
	 /// <returns>随机产生的字符串</returns>
	 public static string GetRandomString(int pwdlen)
	 {
	 return GetRandomString("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_*", pwdlen);
	 }
	
	 /// <summary>
	 /// 获取指定长度的纯字母随机字符串
	 /// </summary>
	 /// <param name="pwdlen">数字串长度</param>
	 /// <returns>纯字母随机字符串</returns>
	 public static string GetRandWord(int pwdlen)
	 {
	 return GetRandomString("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", pwdlen);
	 }
	
	 /// <summary>
	 /// 获取指定长度的纯数字随机数字串
	 /// </summary>
	 /// <param name="intlong">数字串长度</param>
	 /// <returns>纯数字随机数字串</returns>
	 public static string GetRandomNum(int intlong)
	 {
	 StringBuilder w = new StringBuilder(string.Empty);
	
	 for (int i = 0; i < intlong; i++)
	 {
	 w.Append(rand.Next(10));
	 }
	
	 return w.ToString();
	 }
	
	 /// <summary>
	 /// 获取按照年月时分秒随机数生成的文件名
	 /// </summary>
	 /// <returns>随机文件名</returns>
	 public static string GetFileRndName()
	 {
	 return DateTime.Now.ToString("yyyyMMddHHmmss", CultureInfo.CurrentCulture) + GetRandomString("0123456789", 4);
	 }
	 }
	}
试试其它关键字
　RandomHelper　　随机数　
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