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  • 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">

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  • 原文地址:https://www.cnblogs.com/tuyile006/p/711874.html
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