using System;
using System.Security.Cryptography;
public class RNG
{
private static RNGCryptoServiceProvider rngp = new RNGCryptoServiceProvider();
private static byte[] rb = new byte[4];
/// <summary>
/// 产生一个非负数的乱数
/// </summary>
public static int Next()
{
rngp.GetBytes(rb);
int value = BitConverter.ToInt32(rb, 0);
if (value < 0) value = -value;
return value;
}
/// <summary>
/// 产生一个非负数且最大值在 max 以下的乱数
/// </summary>
/// <param name="max">最大值</param>
public static int Next(int max)
{
rngp.GetBytes(rb);
int value = BitConverter.ToInt32(rb, 0);
value = value % (max + 1);
if (value < 0) value = -value;
return value;
}
/// <summary>
/// 产生一个非负数且最小值在 min 以上最大值在 max 以下的乱数
/// </summary>
/// <param name="min">最小值</param>
/// <param name="max">最大值</param>
public static int Next(int min, int max)
{
int value = Next(max - min) + min;
return value;
}
}
posted @ 2008-06-17 01:21
nasa 阅读(433)
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