ASP.NET code tutorial for completing graphic verification code

This article introduces you to the implementation method of asp.net mid-picture graphic verification code. The code is simple and easy to understand, very good, and has reference value. Friends who need it can refer to it.

Share this article with everyone A piece of asp.net code implements the function of drawing a graphical verification code. The code is simple and easy to understand. The specific code is as follows:

context.Response.ContentType = "image/jpeg";
   //生成随机的中文验证码
   string yzm = "人口手大小多少上中下男女天地会反清复明杨中科小宝双儿命名空间语现在明天来多个的我山东河北南固安北京南昌东海西安是沙河高教园学"
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    + "童立是我朵叶美机她过他时送让吗往吧得虫很河借姐呢呀哪谁凉怕量跟最园脸因阳为光可法石找办许别那到都吓叫再做象点像照沙海桥军竹苗井面乡"
    + "忘想念王这从进边道贝男原爱虾跑吹乐地老快师短淡对热冷情拉活把种给吃练学习非苦常问伴间共伙汽分要没孩位选北湖南秋江只帮星请雪就球跳玩"
    + "桃树刚兰座各带坐急名发成动晚新有么在变什条";
   Random r = new Random();
   string validCode = "";
   for (int i = 0; i < 4; i++)
   {
    int number = r.Next(0, yzm.Length);
    validCode += yzm[number];
   }
   //画图
   using(Bitmap b = new Bitmap(150, 30))
   {
    using (Graphics g = Graphics.FromImage(b))
    using(Font f = new Font("宋体", 20))
    {
     g.Clear(Color.Yellow);//清除整个绘画面并填充指定背景色
     g.DrawString(validCode, f, Brushes.Red, new PointF(0, 0));//开始绘制
     //前景点
     for (int i = 0; i < 100; i++)
     {
      int x = r.Next(0, 150);
      int y = r.Next(0, 30);
      b.SetPixel(x, y, Color.Red);
     }
     //后景线
     for (int i = 0; i < 100; i++)
     {
      int x = r.Next(0, 150);
      int y = r.Next(0, 30);
      g.DrawLine(Pens.Red, x, y, x + 1, y + 1);
     }
    }
    b.Save(context.Response.OutputStream, ImageFormat.Jpeg);//保存到输出流中
   }

Reference:

A collection of methods for generating verification codes in asp.net (1 )

Asp.net developed webform image watermark and image verification code implementation method

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