ValidCode.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Sent_Email
{
    class ValidCode
    {
        #region ============私有变量===============
        private const double PI = 3.1415926535897932384626433832795;
        private const double PI2 = 6.283185307179586476925286766559;
        private int _len;
        private CodeType _codetype;
        private readonly Single _jianju = (float)18.0;
        private readonly Single _height = (float)24.0;
        private string _checkCode;

        #endregion ===============================

        #region  ============公有方法===============
        public string CheckCode
        {
            get
            {
                return _checkCode;
            }
        }
        #endregion ===============================

        #region ============构造函数===================
        /// <summary> 
        /// public constructors
        /// </summary> 
        /// <param name="len"> 验证码长度 </param> 
        /// <param name="ctype"> 验证码类型：字母、数字、字母+ 数字 </param> 
        public ValidCode(int len, CodeType ctype)
        {
            this._len = len;
            this._codetype = ctype;
        }

        #endregion===============================

        #region =======公有变量========================

        public enum CodeType { Words, Numbers, Characters, Alphas }

        #endregion===============================

        #region ==============私有方法：三种类别的验证码=================
        private string GenerateNumbers()//生成验证码内容
        {
            string strOut = "";
            System.Random random = new Random();
            for (int i = 0; i < _len; i++)