randomvalueservice.cs

来自「该项目中对 SQLHelper 类进行了简单封装」· CS 代码 · 共 65 行

/* 
 * RandomValueService.cs @Microsoft Visual Studio 2005 <.NET Framework 2.0>
 * AfritXia
 * 2007-12-16
 * 
 * Copyright(c) http://www.AfritXia.NET/
 * 
 */

using System;

namespace NET.AfritXia.SecurityUtility
{
	/// <summary>
	/// 随机值服务
	/// </summary>
	public sealed class RandomValueService
	{
		// 随机数生成器
		private static readonly Random g_random = new Random();

		/// <summary>
		/// 获取随机代码
		/// </summary>
		/// <param name="length">代码长度</param>
		/// <param name="startWithWord">以英文字母开始</param>
		/// <param name="groupSize">分组大小，当该值为 -1 时则忽略分组</param>
		/// <param name="separator">分组间的间隔字符串</param>
		/// <returns></returns>
		public static string GetRandomString(int length, bool startWithWord, int groupSize, string separator)
		{
			// 随机码
			string randomCode = "";
			// ASCII 码
			int asciiCode;

			int i = 0;

			while (i < length)
			{
				// 获取 ASCII 字符
				asciiCode = g_random.Next(48, 122);

				if ((asciiCode >= 58 && asciiCode <= 64) || (asciiCode >= 91 && asciiCode <= 96))
					continue;

				// 不以数字开头
				if (startWithWord && i == 0 && (asciiCode >= 48 && asciiCode <= 57))
					continue;

				if (groupSize != -1)
				{
					if ((i != 0) && (i % Math.Abs(groupSize) == 0))
						randomCode += separator;
				}

				randomCode += (char)asciiCode;

				i++;
			}

			return randomCode;
		}
	}
}