RolePermission.Common/ValidateCode.cs

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using System;
using System.DrawingCore;
using System.DrawingCore.Drawing2D;
using System.DrawingCore.Imaging;
using System.IO;

namespace RolePermission.Common
{
    public class ValidateCode
    {
        /// <summary>
        /// 验证码的最大长度
        /// </summary>
        public int MaxLength => 10;

        /// <summary>
        /// 验证码的最小长度
        /// </summary>
        public int MinLength => 1;

        /// <summary>
        /// 生成验证码
        /// </summary>
        /// <param name="length">指定验证码的长度</param>
        /// <returns></returns>
        public string CreateValidateCode(int length)
        {
            int[] randMembers = new int[length];
            int[] validateNums = new int[length];
            string validateNumberStr = "";
            //生成起始序列值
            int seekSeek = unchecked((int) DateTime.Now.Ticks);
            Random seekRand = new Random(seekSeek);
            int beginSeek = (int) seekRand.Next(0, Int32.MaxValue - length * 10000);
            int[] seeks = new int[length];
            for (int i = 0; i < length; i++)
            {
                beginSeek += 10000;
                seeks[i] = beginSeek;
            }

            //生成随机数字
            for (int i = 0; i < length; i++)
            {
                Random rand = new Random(seeks[i]);
                int pownum = 1 * (int) Math.Pow(10, length);
                randMembers[i] = rand.Next(pownum, Int32.MaxValue);
            }

            //抽取随机数字
            for (int i = 0; i < length; i++)
            {
                string numStr = randMembers[i].ToString();
                int numLength = numStr.Length;
                Random rand = new Random();
                int numPosition = rand.Next(0, numLength - 1);
                validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
            }

            //生成验证码