学步园

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Web.UI;
using System.Drawing.Drawing2D;
using System.IO;
using System.Text;
using System.Collections.Specialized;
namespace Vegnet.Common.Framework.Util
...{
    /**//// <summary>
    /// 生成验证码的类
    ///  </summary>
    调用示例#region 调用示例
       //* *********************************************调用示例**************************************************
         * 作者 downnmoon(邀月) 2006年11月************************************************************************
     
        //呈现页面后台
        private void getNumbers(int len)
            ...{
                ValidateNumber.CurrentLength=len;
                ValidateNumberAndChar.CurrentNumber=ValidateNumberAndChar.CreateValidateNumber(ValidateNumberAndChar.CurrentLength);
                string number=ValidateNumberAndChar.CurrentNumber;
                ValidateNumberAndChar.CreateValidateGraphic(this,number);
                HttpCookie a = new HttpCookie("VegnetValidNumber2", number);
                Response.Cookies.Add(a);
                        
            }
        //验证页面前台
            <asp:TextBox id="TextBox3"  runat="server"></asp:TextBox>
            <asp:Label id="Label3"  runat="server"></asp:Label>
            <asp:Button id="Button3"  runat="server"Text="验证"></asp:Button>
            <IMGsrc="DispValid.aspx">
        //验证页面后台
        private void Button3_Click(object sender, System.EventArgs e)
            ...{
                HttpCookieCollection cookies = Request.Cookies;
                string tmp = cookies["VegnetValidNumber2"].Value;
                this.Label3.Text=(tmp.Trim().ToLower()==TextBox3.Text.Trim().ToLower())?"正确":"无效";
            }
            
                    
        ******************************************************************************************************/
    
       #endregion
    public  class ValidateNumberAndChar
    ...{
        public ValidateNumberAndChar()
        ...{
        }
        /**//// <summary>
        /// 验证码的最大长度
        /// </summary>
        public static  int MaxLength
        ...{
            get...{return 10;}
        }
        /**//// <summary>
        /// 验证码的最小长度
        /// </summary>
        public static int MinLength
        ...{
            get...{return 1;}
        }
        /**//// <summary>
        /// 验证码的前缀
        /// </summary>
        public static string BaseString
        ...{
            get
            ...{
                return "VegnetValidNumber";
            }
        }
        /**//// <summary>
        /// 当前字符串长度，主要是为了更换图片时用
        /// </summary>
        private static int _currentLength=5;
        public static int CurrentLength
        ...{
            get
            ...{
                return _currentLength;
            }
            set
            ...{
                _currentLength=value;
            }
        }
        /**//// <summary>
        /// 当前字符串，主要是为了更换图片时用
        /// </summary>
        private static string _currentNumber="";
        public static string CurrentNumber
        ...{
            get
            ...{
                if(_currentNumber!="")
                ...{
                    return     _currentNumber;
                }
                else
                ...{
                    return CreateValidateNumber(CurrentLength);
                }
            }
            set
            ...{
                _currentNumber=value;
            }
        }

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