Beautiful Mizuki!

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using System;
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using System.IO;
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namespace 随机密码生成器
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{
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    internal class Program
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    {
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        static void Main(string[] args)
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        {
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            string[] uppercase = new string[] { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "N", "M", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
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            string[] lowercase = new string[] { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "n", "m", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };
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            string[] num = new string[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
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            string[] symbols = new string[] { ".", "+", "-", "*", "/" };
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            Random rand = new Random();
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            StreamWriter streamWriter = new StreamWriter("password.txt", true);
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            Console.WriteLine("输入密码强度,输入1为纯数字,2为数字加小写字母,3为数字加上大小写字母,4为数字加上大小写字母加上符号");
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            while (true)
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            {
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                string password = "";
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                try
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                {
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                    int strength = int.Parse(Console.ReadLine());
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                    Console.WriteLine("输入密码长度");
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                    int length = int.Parse(Console.ReadLine());
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                    password = GeneratePassword(strength, length, rand, uppercase, lowercase, num, symbols);
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                    Console.WriteLine(password);
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                    SavePassword(password, streamWriter);
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                }
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                catch (Exception e)
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                {
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                    Console.WriteLine(e.ToString());
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                    Console.ReadKey();
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                }
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            }
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        }
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        private static string GeneratePassword(int strength, int length, Random rand,
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            string[] uppercase, string[] lowercase, string[] num, string[] symbols)
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        {
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            string password = "";
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            for (int i = 0; i < length; i++)
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            {
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                int choice = rand.Next(0, strength);
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                switch (strength)
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                {
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                    case 1:
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                        password += num[rand.Next(num.Length)];
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                        break;
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                    case 2:
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                        password += (choice == 0) ? num[rand.Next(num.Length)]
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                                                : lowercase[rand.Next(lowercase.Length)];
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                        break;
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                    case 3:
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                        if (choice == 0) password += num[rand.Next(num.Length)];
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                        else if (choice == 1) password += lowercase[rand.Next(lowercase.Length)];
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                        else password += uppercase[rand.Next(uppercase.Length)];
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                        break;
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                    case 4:
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                        if (choice == 0) password += num[rand.Next(num.Length)];
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                        else if (choice == 1) password += lowercase[rand.Next(lowercase.Length)];
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                        else if (choice == 2) password += uppercase[rand.Next(uppercase.Length)];
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                        else password += symbols[rand.Next(symbols.Length)];
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                        break;
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                }
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            }
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            return password;
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        }
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        private static void SavePassword(string password, StreamWriter streamWriter)
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        {
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            streamWriter.WriteLine(DateTime.Now);
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            streamWriter.WriteLine(password);
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            streamWriter.WriteLine("---------------------------------");
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            streamWriter.Flush();
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        }
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    }
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}