C#中文随机数实现方法

/// <summary>/// 随机中文码/// </summary>/// <returns></returns>private string GetRndCh(){ System.Text.Encoding gb = System.Text.Encoding.Default; //获取GB2312编码页（表） object[] bytes = CreateRegionCode(4); //调用函数产生4个随机中文汉字编码 string[] str = new string[4]; System.Text.StringBuilder sb = new System.Text.StringBuilder(); for (int i = 0; i < 4; i++) {   //根据汉字编码的字节数组解码出中文汉字   str[i] = gb.GetString((byte[])Convert.ChangeType(bytes[i], typeof(byte[])));   sb.Append( str[i].ToString()); } return sb.ToString (); } /// <summary> /// 产生随机中文汉字编码 /// </summary> /// <param name="strlength"></param> /// <returns></returns> private static object[] CreateRegionCode(int strlength) { //定义一个字符串数组储存汉字编码的组成元素 string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };  Random rnd = new Random(); object[] bytes = new object[strlength]; for (int i = 0; i < strlength; i++) {   //区位码第1位   int r1 = rnd.Next(11, 14);   string str_r1 = rBase[r1].Trim();   //区位码第2位   rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);   int r2;   if (r1 == 13)   {   r2 = rnd.Next(0, 7);   }   else   {   r2 = rnd.Next(0, 16);   }   string str_r2 = rBase[r2].Trim();   //区位码第3位   rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i);   //更换随机种子   int r3 = rnd.Next(10, 16);   string str_r3 = rBase[r3].Trim();   //区位码第4位   rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i);   int r4;   if (r3 == 10)   {   r4 = rnd.Next(1, 16);   }   else if (r3 == 15)   {   r4 = rnd.Next(0, 15);   }   else   {   r4 = rnd.Next(0, 16);   }   string str_r4 = rBase[r4].Trim();   //定义两个字节变量存储产生的随机汉字区位码   byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);   byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);   //将两个字节变量存储在字节数组中   byte[] str_r = new byte[] { byte1, byte2 };   //将产生的一个汉字的字节数组放入object数组中   bytes.SetValue(str_r, i); } return bytes;}