cyf
66 lines
1.8 KiB
C#
66 lines
1.8 KiB
C#
using System.Security.Cryptography;
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namespace Zhaizj.Framework.Utils
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{
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/// <summary>
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/// 随机数实用类
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/// </summary>
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public static class RandomHelper
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{
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/// <summary>
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/// 获取随机字节序列
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/// </summary>
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/// <param name="length">字节序列的长度</param>
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/// <returns>字节序列</returns>
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public static byte[] GetRandomBytes(int length) {
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if(length <= 0) {
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return new byte[0];
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}
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RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
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byte[] ret = new byte[length];
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rng.GetNonZeroBytes(ret);
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return ret;
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}
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/// <summary>
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/// 缺省的字符串取值范围
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/// </summary>
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public const string DEFAULT_CHARLIST = "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
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/// <summary>
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/// 可读的字符串取值范围,数字与字母
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/// </summary>
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public const string READ_CHARLIST = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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/// <summary>
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/// 获取随机字符串
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/// </summary>
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/// <param name="length">字符串长度</param>
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/// <param name="charList">字符串取值范围（如果为Null或为空，则返回空字符串）</param>
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/// <returns>随机字符串</returns>
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public static string GetRandomString(int length, string charList) {
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if(length <= 0 || Checker.CheckEmptyString("charList", charList, false)) {
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return string.Empty;
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}
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int num = charList.Length;
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char[] ret = new char[length];
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byte[] rnd = GetRandomBytes(length);
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for(int i = 0; i < rnd.Length; i++) {
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ret[i] = charList[rnd[i] % num];
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}
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return new string(ret);
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}
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/// <summary>
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/// 获取随机字符串
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/// </summary>
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/// <param name="length">字符串长度</param>
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/// <returns>随机字符串</returns>
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/// <remarks>
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/// 缺省使用ASCII从33到126共94个字符作为取值范围
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/// </remarks>
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public static string GetRandomString(int length) {
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return GetRandomString(length, DEFAULT_CHARLIST);
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}
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}
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}
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