public class NameGenerator
    {
        public string[] FirstNames { get; set; }
        public string[] BoyWords { get; set; }
        public string[] GirlWords { get; set; }

        Random _rand = new Random((int)DateTime.Now.Ticks);

        public NameGenerator()
        {
            FirstNames = new[] { "赵","钱","孙","李","周","吴","郑","王","冯","陈","褚","卫","蒋","沈","韩","杨","朱","秦","尤","许","何","吕","施","张","孔","曹","严","华","金","魏","陶","姜","戚","谢","邹","水","昌","马","苗","凤","花","方","俞","任","袁","柳","鲍","史","唐","费","岑","薛","雷","贺","倪","汤","殷","罗","毕","郝","邬","安","常","乐","于","时","齐","康","伍","余","元","顾","孟","黄", "欧阳","夏侯","皇甫","上官"};
            BoyWords = new[] { "刚","强","仁","发","民","国","忠","艺","文","德","志","智","辉","华","军","生","裕","健","炎","宏","毅","坚","石","超","鹏","亮","锦","家","春","磊","勇","正","东","南","斌","武","友","祖","颂","小","宇","兴","波","荣","峰","祥","思","振","海","凯","远","汉","桥","松","柏","利","大"};
            GirlWords = new[] { "花","华","芳","芬","燕","虹","菁","丽","娟","莘","苹","红","玉","妙","丹","芸","香","蕾","兰","慧","玲","静","茹","怡","紫"};
        }

        public string generate(string first_name, int sex, int length)
        {
            var index = 0;
            if (string.IsNullOrEmpty(first_name))
            {
                index = _rand.Next(FirstNames.Length);
                first_name = FirstNames[index];
            }
            var name = first_name;
            if (sex < 0 || sex > 1)
            {
                sex = _rand.Next(2);
            }
            if (length < 1)
            {
                length = _rand.Next(2) + 1;
            }
            
            for (int i = 0; i < length; i++)
            {
                if (sex == 0)
                {
                    index = _rand.Next(BoyWords.Length);
                    name += BoyWords[index];
                }
                else
                {
                    index = _rand.Next(GirlWords.Length);
                    name += GirlWords[index];
                }
            }
            return name;
        }