C#随机生成中文

namespace WindowsFormsApplication4
{
        public partial class Form1 : Form
        {
                public Form1()
                {
                        InitializeComponent();
                }

                private void Form1_Load(object sender, EventArgs e)
                {

                }

                private void button1_Click(object sender, EventArgs e)
                {

                        //获取GB2312编码页（表）
                        StringBuilder temp = new StringBuilder();
                        string str4 = "";
                        string str1 = "";
                        int i = 1;

　　　　　　　　//用for循环总是会出现很多相同的 不知道为什么
                        while (i<1000)
                        {
                                str4 = "";
                                str4 = RText();
                                if (str4 == str1)
                                {
                                        continue;
                                }
                                else
                                {
                                        i += 1;
                                        str1 = str4;
                                        temp.AppendFormat("{0};\r\n", "INSERT INTO " + textBox5.Text.Trim() + "(" + textBox6.Text.Trim() + "," + textBox7.Text.Trim() + ") VALUES ('" + (i + 1).ToString() + "','" + str4 + "') ");
                                }
                        }

                        string[] strss = new string[] { temp.ToString() };
                        File.WriteAllLines(Application.StartupPath + "\\sql.txt", strss);
                }

                string RText()
                {
                        string str1 = "", str2 = "", str3 = "";
                        Encoding gb = Encoding.GetEncoding("gb2312");
                        //调用函数产生4个随机中文汉字编码
                        object[] bytes = new ChineseCode().CreateRegionCode(3);
                        //根据汉字编码的字节数组解码出中文汉字
                        str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));
                        str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));
                        str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));
                        return str1 + str2 + str3;
                }
        }

        public class ChineseCode
        {
                /**/
                /*
                此函数在汉字编码范围内随机创建含两个元素的十六进制字节数组，每个字节数组代表一个汉字，并将
                四个字节数组存储在object数组中。
                参数：strlength，代表需要产生的汉字个数
                */
                public 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();

                        //定义一个object数组用来
                        object[] bytes = new object[strlength];

                        /**/
                        /*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中
                            每个汉字有四个区位码组成
                            区位码第1位和区位码第2位作为字节数组第一个元素
                            区位码第3位和区位码第4位作为字节数组第二个元素
                        */
                        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);//更换随机数发生器的

                                //种子避免产生重复值
                                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);
                                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;
                }
        }
}