src/Czar.Cms.Core/Helper/CaptchaHelper.cs

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/**
*┌──────────────────────────────────────────────────────────────┐
*│　描    述：验证码帮助类  参考自：汪宇杰博客   https://edi.wang/post/2018/10/13/generate-captcha-code-aspnet-core                                               
*│　作    者：yilezhu                                             
*│　版    本：1.0                                                 
*│　创建时间：2019/1/21 21:51:22                             
*└──────────────────────────────────────────────────────────────┘
*┌──────────────────────────────────────────────────────────────┐
*│　命名空间： Czar.Cms.Core.Helper                                   
*│　类    名： CaptchaHelper                                      
*└──────────────────────────────────────────────────────────────┘
*/
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Text;

namespace Czar.Cms.Core.Helper
{
    public static class CaptchaHelper
    {
        public static string Letters { get; set; } = "2346789ABCDEFGHJKLMNPRTUVWXYZ";

        public static int CodeLength { get; set; } = 4;

        public static string GenerateCaptchaCode()
        {
            var rand = new Random();
            var maxRand = Letters.Length - 1;

            var sb = new StringBuilder();
            for (var i = 0; i < CodeLength; i++)
            {
                var index = rand.Next(maxRand);
                sb.Append(Letters[index]);
            }

            return sb.ToString();
        }

        public static CaptchaResult GetImage(int width, int height, string captchaCode, bool drawBezier = false)
        {
            using (var baseMap = new Bitmap(width, height))
            using (var graph = Graphics.FromImage(baseMap))
            {
                var rand = new Random();

                graph.Clear(GetRandomLightColor());

                DrawCaptchaCode();
                DrawDisorderLine();
                AdjustRippleEffect();

                var ms = new MemoryStream();
                baseMap.Save(ms, ImageFormat.Png);

                return new CaptchaResult
                {