using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace LifePayment.Domain.Shared;
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public static class GlobalRandom
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{
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// 字符集
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private static readonly string LowerCase = "abcdefghijklmnopqrstuvwxyz";
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private static readonly string UpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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private static readonly string Digits = "0123456789";
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private static readonly string Symbols = "~`!@#$%^&*\\|()_-+=\\、{}\\[\\]'\"<>?.,:;/";
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/// <summary>
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/// 获取指定位数的随机数
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/// </summary>
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/// <param name="length"></param>
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/// <returns></returns>
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public static string GetRandomNum(int length)
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{
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var ranInt = 0;
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var minAMax = GetMinAndMaxNumByLength(length);
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ranInt = Random.Shared.Next(minAMax.Min, minAMax.Max + 1);
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return ranInt.ToString().PadLeft(length, '0');
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}
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/// <summary>
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/// 获取指定位数的十进制数的最大值和最小值
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/// </summary>
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/// <param name="length"></param>
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/// <param name="isOneMin"></param>
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/// <returns></returns>
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/// <exception cref="ArgumentException"></exception>
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public static (int Min, int Max) GetMinAndMaxNumByLength(int length, bool minIsOne = true)
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{
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if (length <= 0) throw new ArgumentException("length必须大于等于0");
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if (length == 0) return (0, 0);
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var min = minIsOne ? 1 : (int)Math.Pow(10, length - 1);
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var max = (int)Math.Pow(10, length) - 1;
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return (min, max);
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}
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/// <summary>
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/// 根据指定长度和字符池获取指定长度的随机字符串
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/// </summary>
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/// <param name="length"></param>
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/// <param name="charPool"></param>
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/// <returns></returns>
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public static string GetRandomStrFromCharPool(int length, char[] charPool)
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{
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string result = null;
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if (length > 0 && charPool.IsNotNullOrEmpty())
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{
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Shuffle(charPool);
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for (int i = 0; i < length; i++)
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{
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result += charPool[Random.Shared.Next(0, charPool.Length)];
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}
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}
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return result;
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}
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/// <summary>
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/// 获取随机密码
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/// </summary>
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/// <param name="length"></param>
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/// <param name="charPool"></param>
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/// <returns></returns>
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public static string GetRandomPassword(int minLenth = 6, int maxLenth = 6)
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{
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// 生成一个合法的字符串长度
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int length = minLenth == maxLenth ? minLenth : Random.Shared.Next(minLenth, maxLenth + 1); // 6 到 16 的随机长度
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// 至少包含一个字母、数字和符号
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var sb = new StringBuilder();
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sb.Append(LowerCase[Random.Shared.Next(LowerCase.Length)]); // 加一个小写字母
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sb.Append(UpperCase[Random.Shared.Next(UpperCase.Length)]); // 加一个大写字母
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sb.Append(Digits[Random.Shared.Next(Digits.Length)]); // 加一个数字
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//sb.Append(Symbols[Random.Shared.Next(Symbols.Length)]); // 加一个符号
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// 填充其余字符
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var allChars = LowerCase + UpperCase + Digits;
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for (int i = sb.Length; i < length; i++)
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{
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sb.Append(allChars[Random.Shared.Next(allChars.Length)]);
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}
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// 打乱字符顺序，以确保字符种类不被集中在前面
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return new string(sb.ToString().OrderBy(c => Random.Shared.Next()).ToArray());
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}
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/// <summary>
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/// 随机洗牌
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="array"></param>
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public static void Shuffle<T>(T[] array)
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{
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Random rng = new Random();
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int n = array.Length;
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for (int i = n - 1; i > 0; i--)
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{
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int j = rng.Next(i + 1);
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(array[i], array[j]) = (array[j], array[i]); // 交换元素
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}
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}
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}
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