学步园

 在类库横行的今天，请支持DIY ，直接看代码（有注释）

using System;</p> <p>namespace MyRandom<br /> {<br /> public class Rand<br /> {<br /> private long seed; //随机数种子 </p> <p> //用系统时间作为随机种子<br /> public Rand()<br /> {<br /> string str = DateTime.Now.Day.ToString();<br /> str += DateTime.Now.Hour.ToString();<br /> str += DateTime.Now.Minute.ToString();<br /> str += DateTime.Now.Second.ToString();<br /> str += DateTime.Now.Millisecond.ToString();<br /> this.seed = long.Parse(str);<br /> }<br /> //用户自定义随机种子<br /> public Rand(long Value)<br /> {<br /> this.seed = Value;<br /> }</p> <p> //产生非负伪随机数<br /> public long Next()<br /> {<br /> long l = this.seed;<br /> l = l * l;<br /> string strTime = l.ToString();<br /> int w = strTime.Length / 3;<br /> string str = "";<br /> for (int i = w; i < strTime.Length - w; i++)<br /> str += strTime[i];<br /> l = long.Parse(str);<br /> return l;<br /> }<br /> //产生上限为Value的伪随机数<br /> public long Next(long Value)<br /> {<br /> if (Value < 0)<br /> return -1;<br /> long l = this.seed;<br /> l = l * l;<br /> string strTime = l.ToString();<br /> int w = strTime.Length / 3;<br /> string str = "";<br /> for (int i = w; i < strTime.Length - w; i++)<br /> str += strTime[i];<br /> l = long.Parse(str);<br /> return l % Value;<br /> }<br /> //产生下限为minValue上限为maxValue的伪随机数<br /> public long Next(long minValue, long maxValue)<br /> {<br /> if (minValue < 0 || maxValue < 0 || minValue > maxValue)<br /> return -1;<br /> long l = this.seed;<br /> l = l * l;<br /> string strTime = l.ToString();<br /> int w = strTime.Length / 3;<br /> string str = "";<br /> for (int i = w; i < strTime.Length - w; i++)<br /> str += strTime[i];<br /> l = long.Parse(str);<br /> return l % (maxValue - minValue) + minValue;<br /> }<br /> //伪随机数填充指定的比特数组<br /> public void NextBytes(byte[] buffer)<br /> {<br /> long Value = 0;<br /> Value = this.Next() % 255;<br /> for (int i = 0; i < buffer.Length; i++)<br /> {<br /> Value = Value * Value;<br /> string strTime = Value.ToString();<br /> int w = strTime.Length / 3;<br /> string str = "";<br /> for (int j = w; j < strTime.Length - w; j++)<br /> str += strTime[j];<br /> Value = long.Parse(str);<br /> Value = Value % 255;<br /> buffer[i] = (byte)Value;<br /> }<br /> }<br /> //产生0.0到1.0的伪随机数<br /> public double NextDouble()<br /> {<br /> long l = this.Next(0, 100000);<br /> if (l == 100000)<br /> return 1.0;<br /> l = l * l;<br /> string strTime = l.ToString();<br /> int w = strTime.Length / 3;<br /> string str = "0.";<br /> for (int i = w; i < strTime.Length - w; i++)<br /> str += strTime[i];<br /> double d = double.Parse(str);<br /> return d;<br /> }<br /> }<br /> }