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public class RandomStringBuilder
    {
        /// 

        /// 生成單個(gè)隨機(jī)數(shù)字
        /// 
        private int createNum()
        {
            Random random = new Random(Guid.NewGuid().GetHashCode());
            int num = random.Next(10);
            return num;
        }

        /// 

        /// 生成單個(gè)大寫隨機(jī)字母
        /// 
        private string createBigAbc()
        {
            //A-Z的 ASCII值為65-90
            Random random = new Random(Guid.NewGuid().GetHashCode());
            int num = random.Next(65, 91);
            string abc = Convert.ToChar(num).ToString();
            return abc;
        }

        /// 

        /// 生成單個(gè)小寫隨機(jī)字母
        /// 
        private string createSmallAbc()
        {
            //a-z的 ASCII值為97-122
            Random random = new Random(Guid.NewGuid().GetHashCode());
            int num = random.Next(97, 123);
            string abc = Convert.ToChar(num).ToString();
            return abc;
        }


        /// 

        /// 生成隨機(jī)字符串
        /// 
        /// 字符串的長度
        /// 
        public string Create(int length)
        {
            // 創(chuàng)建一個(gè)StringBuilder對(duì)象存儲(chǔ)密碼
            StringBuilder sb = new StringBuilder();
            //使用for循環(huán)把單個(gè)字符填充進(jìn)StringBuilder對(duì)象里面變成14位密碼字符串
            for (int i = 0; i < length; i++)
            {
                Random random = new Random(Guid.NewGuid().GetHashCode());
                //隨機(jī)選擇里面其中的一種字符生成
                switch (random.Next(3))
                {
                    case 0:
                        //調(diào)用生成生成隨機(jī)數(shù)字的方法
                        sb.Append(createNum());
                        break;
                    case 1:
                        //調(diào)用生成生成隨機(jī)小寫字母的方法
                        sb.Append(createSmallAbc());
                        break;
                    case 2:
                        //調(diào)用生成生成隨機(jī)大寫字母的方法
                        sb.Append(createBigAbc());
                        break;
                }
            }
            return sb.ToString();
        }
    }