简单的验证码Winform程序

之前想过写验证的的小程序，一直没写，现在手头项目结项，根据自己的思路快的写了个小的WinForm的验证码程序。代码简单没有多大难度。

frmVerification.cs前台

winform项目中的frmVerification.cs后台代骊

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using VerificationCode;

namespace VerificationCodeUI
{
    public partial class frmVerification : Form
    {
        CodeImg codeImg;
        string strCode;
        public frmVerification()
        {
            InitializeComponent();
            codeImg = new CodeImg();
            GetCodeImg();
        }
        private void GetCodeImg()
        {
            pictureBox1.Image = codeImg.GetCodeImg(4, pictureBox1.Width, pictureBox1.Height, out strCode);
        }
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            GetCodeImg();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.ToLower() == strCode.ToLower())
                MessageBox.Show("OK");
            else
                MessageBox.Show("No");
        }
    }
}

dll项目中的CodeImg.cs

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

namespace VerificationCode
{
    public class CodeImg
    {
        int length;
        /// <summary>
        /// 长度
        /// </summary>
        public int Length
        {
            get { return length; }
            set { length = value; }
        }
        int width;
        /// <summary>
        /// 宽度
        /// </summary>
        public int Width
        {
            get { return width; }
            set { width = value; }
        }
        int height;
        /// <summary>
        /// 高度
        /// </summary>
        public int Height
        {
            get { return height; }
            set { height = value; }
        }
        string code = "";
        /// <summary>
        /// 验证码
        /// </summary>
        public string Code
        {
            get { return code; }
            set { code = value; }
        }

        /// <summary>
        /// 随机的字符数组
        /// </summary>
        string[] seeds={"1","2","3","4","5","6","7","8","9","0",
                            "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",
                            "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"
        };

        public string[] Seeds
        {
            get { return seeds; }
            set { seeds = value; }
        }

        public CodeImg()
        {
            
        }
        public CodeImg(int w,int h)
        {
            Width = w;
            Height = h;
        }

        public Image GetCodeImg(int length,int w,int h,out string strCode)
        {
            Random rand;

            StringBuilder strbCode=new StringBuilder();
            int index=0;

            Rectangle rect = new Rectangle(0, 0, w, h);
            Bitmap bitMap = new Bitmap(w, h);
            Image codeImg = bitMap;
            Graphics g = Graphics.FromImage(codeImg);
            int fontSize = 16;
            Font f = new Font("宋体", fontSize);
            SolidBrush s=new SolidBrush(Color.Red);
            int x = fontSize + 4;
            int y=Convert.ToInt32(Math.Ceiling((decimal)((h - 16) / 2)));
            int zeed = 0;
            for(int i=0;i<length;i++)
            {
                zeed = (int)(DateTime.Now.Ticks);

                rand = new Random(zeed);
                index=rand.Next(Seeds.Length);
                strbCode.Append(seeds[index]);

                g.DrawString(seeds[index], f, s, x * i, y);
                System.Threading.Thread.Sleep(50);
            }
            strCode = strbCode.ToString();
            return codeImg;
        }
    }
}