【分享】C#验证码类，超级详细解释，适合新手使用
using System;using System.Web;using System.Drawing;using System.Security.Cryptography;namespace DotNet.Utilities{ /// <summary> /// 验证码类 /// </summary> public class Rand { #region 生成随机数字 /// <summary> /// 生成随机数字 /// </summary> /// <param name="length">生成长度</param> public static string Number(int Length) { return Number(Length, false); } /// <summary> /// 生成随机数字 /// </summary> /// <param name="Length">生成长度</param> /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param> public static string Number(int Length, bool Sleep) { if (Sleep) System.Threading.Thread.Sleep(3); string result = ""; System.Random random = new Random(); for (int i = 0; i < Length; i++) { result += random.Next(10).ToString(); } return result; } #endregion #region 生成随机字母与数字 /// <summary> /// 生成随机字母与数字 /// </summary> /// <param name="IntStr">生成长度</param> public static string Str(int Length) { return Str(Length, false); } /// <summary> /// 生成随机字母与数字 /// </summary> /// <param name="Length">生成长度</param> /// <param name="Sleep">是否要在生[url=http://www.ruiec.com]www.legowu.net[/url]成前将当前线程阻止以避免重复</param> public static string Str(int Length, bool Sleep) { if (Sleep) System.Threading.Thread.Sleep(3); char[] Pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' }; string result = ""; int n = Pattern.Length; System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks)); for (int i = 0; i < Length; i++) { int rnd = random.Next(0, n); result += Pattern[rnd]; } return result; } #endregion #region 生成随机纯字母随机数 /// <summary> /// 生成随机纯字母随机数 /// </summary> /// <param name="IntStr">生成长度</param> public static string Str_char(int Length) { return Str_char(Length, false); } /// <summary> /// 生成随机纯字母随机数 /// </summary> /// <param name="Length">生成长度</param> /// <param name="Sleep">是否要在生成前将当前线程阻止以避免重复</param> public static string Str_char(int Length, bool Sleep) { if (Sleep) System.Threading.Thread.Sleep(3); char[] Pattern = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' }; string result = ""; int n = Pattern.Length; System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks)); for (int i = 0; i < Length; i++) { int rnd = random.Next(0, n); result += Pattern[rnd]; } return result; } #endregion }