当前文件路径：KeXinCrm/CheckCode.aspx.cs

		            
  1using System;
  2using System.Collections;
  3using System.ComponentModel;
  4using System.Data;
  5using System.Drawing;
  6using System.Web;
  7using System.Web.SessionState;
  8using System.Web.UI;
  9using System.Web.UI.WebControls;
 10using System.Web.UI.HtmlControls;
 11using System.Drawing.Imaging;
 12using System.IO;
 13
 14namespace CRMS
 15...{
 16    /**//// <summary>
 17    /// CheckCode 的摘要说明。
 18    /// </summary>
 19    public partial class CheckCode : System.Web.UI.Page
 20    ...{
 21        public static string CheckCode2="";
 22        protected void Page_Load(object sender, System.EventArgs e)
 23        ...{
 24            this.CreateCheckCodeImage(GenerateCheckCode());
 25        }
 26
 27        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
 28        override protected void OnInit(EventArgs e)
 29        ...{
 30            //
 31            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
 32            //
 33            InitializeComponent();
 34            base.OnInit(e);
 35        }
 36
 37        /**//// <summary>
 38        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
 39        /// 此方法的内容。
 40        /// </summary>
 41        private void InitializeComponent()
 42        ...{ 
 43        }
 44        #endregion
 45
 46        private string GenerateCheckCode()
 47        ...{
 48            int number;
 49            char code;
 50            string checkCode = String.Empty;
 51
 52            System.Random random = new Random();
 53
 54            for(int i=0; i<5; i++)
 55            ...{
 56                number = random.Next();
 57
 58                if(number % 2 == 0)
 59                    code = (char)('0' + (char)(number % 10));
 60                else
 61                    code = (char)('A' + (char)(number % 26));
 62
 63                checkCode += code.ToString();
 64            }
 65
 66            //Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
 67
 68            Session["checkCode2"]=checkCode;
 69            
 70            return checkCode;
 71            //string kk=Session["checkCode2"].ToString();
 72            //Response.Write(kk);
 73            //Response.End();
 74        }
 75
 76        private void CreateCheckCodeImage(string checkCode)
 77        ...{
 78            if(checkCode == null || checkCode.Trim() == String.Empty)
 79                return;
 80
 81            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
 82            Graphics g = Graphics.FromImage(image);
 83
 84            try
 85            ...{
 86                //生成随机生成器
 87                Random random = new Random();
 88
 89                //清空图片背景色
 90                g.Clear(Color.White);
 91
 92                //画图片的背景噪音线
 93                for(int i=0; i<25; i++)
 94                ...{
 95                    int x1 = random.Next(image.Width);
 96                    int x2 = random.Next(image.Width);
 97                    int y1 = random.Next(image.Height);
 98                    int y2 = random.Next(image.Height);
 99
100                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
101                }
102
103                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
104                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
105                g.DrawString(checkCode, font, brush, 2, 2);
106
107                //画图片的前景噪音点
108                for(int i=0; i<100; i++)
109                ...{
110                    int x = random.Next(image.Width);
111                    int y = random.Next(image.Height);
112
113                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
114                }
115
116                //画图片的边框线
117                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
118
119                System.IO.MemoryStream ms = new System.IO.MemoryStream();
120                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
121                Response.ClearContent();
122                Response.ContentType = "image/Gif";
123                Response.BinaryWrite(ms.ToArray());
124            }
125            finally
126            ...{
127                g.Dispose();
128                image.Dispose();
129            }
130        }
131    }
132
133}
134