C#生成图形验证码

产生验证码图片的源码：using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Drawing;using System.IO;

public partial class CreatImage : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        string checkCode = CreateCode(4);        Session["CheckCode"] = checkCode;        CreateImage(checkCode);    }

    /*产生验证码*/    public string CreateCode(int codeLength)    {                string so = "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";        string[] strArr=so.Split(',');        string code = "";        Random rand=new Random();        for (int i = 0; i < codeLength; i++)        {            code+=strArr[rand.Next(0, strArr.Length)];        }        return code;    }

    /*产生验证图片*/    public void CreateImage(string code)    {                Bitmap image = new Bitmap(60, 20);        Graphics g = Graphics.FromImage(image);        WebColorConverter ww=new WebColorConverter();        g.Clear((Color)ww.ConvertFromString("#FAE264"));

        Random random = new Random();        //画图片的背景噪音线        for (int i = 0; i < 12; i++)        {            int x1 = random.Next(image.Width);            int x2 = random.Next(image.Width);            int y1 = random.Next(image.Height);            int y2 = random.Next(image.Height);

            g.DrawLine(new Pen(Color.LightGray), x1, y1, x2, y2);        }        Font font = new Font("Arial", 15, FontStyle.Bold | FontStyle.Italic);        System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(            new Rectangle(0,0,image.Width,image.Height),Color.Blue,Color.Gray,1.2f,true);        g.DrawString(code, font, brush, 0, 0);

        //画图片的前景噪音点        //for (int i = 0; i < 10; i++)        //{        //    int x = random.Next(image.Width);        //    int y = random.Next(image.Height);        //    image.SetPixel(x, y, Color.White);        //}

        //画图片的边框线       // g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

        System.IO.MemoryStream ms = new System.IO.MemoryStream();        image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);        Response.ClearContent();        Response.ContentType = "image/Gif";        Response.BinaryWrite(ms.ToArray());        g.Dispose();        image.Dispose();    }}使用方法：将以上代码保存在网页：createImg.aspx中在你的验证码图片处：<img src="createImg.aspx" align="middle">

转载于:https://www.cnblogs.com/tuyile006/archive/2007/04/13/711874.html

相关资源：c#生成图形验证码类