GDI制作验证码cs代码

最新推荐文章于 2019-12-29 14:49:00 发布

翻译最新推荐文章于 2019-12-29 14:49:00 发布 · 602 阅读

文章标签：

#random #string #object #class

本文介绍了一个使用C#实现的验证码生成系统，包括图像处理、颜色填充、字体设置和验证码数字生成等功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using System.IO;
using System.Text;

public partial class genimage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        System.Drawing.Image img = new Bitmap(200,60);
        Graphics g = Graphics.FromImage(img);
        this.DealImage(img, 8000);
        g.DrawLine(Pens.Red, 0, 0, 200, 60);                 //GDI画得红色斜线
        string code = this.GenerateCode();                     //获取验证码的数字
        Font font = new Font("宋体", 24, FontStyle.Bold | FontStyle.Italic | FontStyle.Strikeout);   //验证码的字体设置|其实是并且的意思
        g.DrawString(code, font, Brushes.GreenYellow, 10, 10);         //GDI画刷填充的颜色
        this.Response.Clear();
        MemoryStream ms = new MemoryStream();
        img.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
        this.Response.BinaryWrite(ms.ToArray());
        this.Response.Flush();
        this.Response.End();
    }
    private void DealImage(System.Drawing.Image img,int nums)
    {
        Bitmap b = img as Bitmap;
        Random ran = new Random();
        for (int i = 0; i < nums; i++)
        {
            b.SetPixel(ran.Next(0, img.Width), ran.Next(0, img.Height), Color.White);
        }
    }
    private string GenerateCode()
    {
        Random ran = new Random(DateTime.Now.Millisecond);
        StringBuilder sb = new StringBuilder(6);
        for (int i = 0; i < 6; i++)
        {
            sb.Append(ran.Next(0, 9));
        }
        return sb.ToString();
    }
}