C#绘制窗体验证码

超、凢脫俗 2022-12-08 15:40 78阅读 0赞

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;
    
    namespace VerCode
    {
        public partial class VerCodeForm : Form
        {
            public VerCodeForm()
            {
                InitializeComponent();
            }
    
            private void picCodeWrapper_Click(object sender, EventArgs e)
            {
                Random rd = new Random();
                string str = null;
                // 生成随机数
                for (int i = 0; i < 5; i++)
                {
                    int rdCode = rd.Next(0, 9);
                    str += rdCode;
                }
                Bitmap bmp = new Bitmap(200, 40);
                Graphics g = Graphics.FromImage(bmp);
                // 绘制验证码
                for (int i = 0; i < 5; i++)
                {
                    Point p = new Point(i * 35, 0);
                    string[] fonts = { "微软雅黑", "幼圆", "隶书", "宋体", "黑体" };
                    Color[] colors = { Color.Red, Color.Orange, Color.Yellow, Color.Green, Color.Blue, Color.Purple };
                    g.DrawString(str[i].ToString(), new Font(fonts[rd.Next(0, 5)], 20, FontStyle.Bold), new SolidBrush(colors[rd.Next(0, 5)]), p);
                }
                // 验证码干扰线
                for (int i = 0; i < 25; i++)
                {
                    Point p1 = new Point(rd.Next(0, bmp.Width), rd.Next(0, bmp.Height));
                    Point p2 = new Point(rd.Next(0, bmp.Width), rd.Next(0, bmp.Height));
                    g.DrawLine(new Pen(Brushes.Green), p1, p2);
                }
                // 验证码干扰像素点
                for (int i = 0; i < 300; i++)
                {
                    Point p = new Point(rd.Next(0, bmp.Width), rd.Next(0, bmp.Height));
                    bmp.SetPixel(p.X, p.Y, Color.Black);
                }
                picCodeWrapper.Image = bmp;
            }
        }
    }

运行示例：  
![在这里插入图片描述][20200920173642208.png_pic_center]

[20200920173642208.png_pic_center]: /images/20221123/23f57fe8073a45b8a81546a5d9aa0f2a.png