C# 生成随即验证码图片类库

using System;
using System.Web;
using System.Collections.Generic;
using System.Text;
using System.Drawing.Imaging;
using System.Drawing;

public class ValidateCode
{

    private int _Length;
    private int _Width;
    private int _Height;
    private int _Points;
    private int _Lines;
    private CodeTypes _CodeType;
    private SaveTypes _SaveType;
    private string _SaveName;
    private string _Code;

    public ValidateCode()
    {
        _Length = 4;
        _Width = _Length * 14;
        _Height = 20;
        _Points = 80;
        _Lines = 5;
        CodeType = CodeTypes.LetterNumber;
        _SaveType = SaveTypes.Session;
        _SaveName = "ValidateCode";
        _Code = "";
        this.GetConfig();
    }

    public int Length
    {
        get { return _Length; }
        set { _Length = value; }
    }

    public int Width
    {
        get { return _Width; }
        set { _Width = value; }
    }

    public int Height
    {
        get { return _Height; }
        set { _Height = value; }
    }

    public int Points
    {
        get { return _Points; }
        set { _Points = value; }
    }

    public int Lines
    {
        get { return _Lines; }
        set { _Lines = value; }
    }

    public CodeTypes CodeType
    {
        get { return _CodeType; }
        set
        {
            _CodeType = value;

            switch (_CodeType)
            {
                case CodeTypes.Letter:
                case CodeTypes.LetterNumber:
                    {
                        _Width = _Length * 14;
                        break;
                    }
                case CodeTypes.Number:
                    {
                        _Width = _Length * 12;
                        break;
                    }
                case CodeTypes.Chinese:
                    {
                        _Width = _Length * 24;
                        break;
                    }
            }
        }
    }

    public SaveTypes SaveType
    {
        get { return _SaveType; }
        set { _SaveType = value; }
    }

    public string SaveName
    {
        get { return _SaveName; }
        set { _SaveName = value; }
    }

    public string Code
    {
        get { return _Code; }
        set { _Code = value; }
    }

    private void GetConfig()
    {
        string _length = System.Configuration.ConfigurationManager.AppSettings["Length"];
        string _width = System.Configuration.ConfigurationManager.AppSettings["Width"];
        string _height = System.Configuration.ConfigurationManager.AppSettings["Height"];
        string _points = System.Configuration.ConfigurationManager.AppSettings["Points"];
        string _lines = System.Configuration.ConfigurationManager.AppSettings["Lines"];
        string _codetype = System.Configuration.ConfigurationManager.AppSettings["CodeType"];
        string _savetype = System.Configuration.ConfigurationManager.AppSettings["SaveType"];
        string _savename = System.Configuration.ConfigurationManager.AppSettings["SaveName"];
        try
        {
            if (_length != null && _length != "")
            {
                _Length = Convert.ToInt32(_length);
            }

            if (_width != null && _width != "")
            {
                _Width = Convert.ToInt32(_width);
            }

            if (_height != null && _height != "")
            {
                _Height = Convert.ToInt32(_height);
            }

            if (_points != null && _points != "")
            {
                _Points = Convert.ToInt32(_points);
            }

            if (_lines != null && _lines != "")
            {
                _Lines = Convert.ToInt32(_lines);
            }

            if (_codetype != null && _codetype != "")
            {
                _codetype = _codetype.ToLower();
                if (_codetype == "letter")
                {
                    CodeType = CodeTypes.Letter;
                }
                if (_codetype == "number")
                {
                    CodeType = CodeTypes.Number;
                }
                if (_codetype == "letternumber")
                {
                    CodeType = CodeTypes.LetterNumber;
                }
                if (_codetype == "chinese")
                {
                    CodeType = CodeTypes.Chinese;
                }
            }

            if (_savetype != null && _savetype != "")
            {
                if (_savetype.ToLower().Trim() == "cookie")
                {
                    _SaveType = SaveTypes.Cookie;
                }
                else
                {
                    _SaveType = SaveTypes.Session;
                }
            }

            if (_savename != null && _savename != "")
            {
                _SaveName = _savename;
            }
        }
        catch { }
    }

    private void GetValidateCode()
    {
        System.Random random = new Random();
        string strChk = "";
        switch (_CodeType)
        {
            case CodeTypes.Number:
                {
                    strChk = "0123456789";
                    break;
                }
            case CodeTypes.Letter:
                {
                    strChk = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                    break;
                }
            case CodeTypes.LetterNumber:
                {
                    strChk = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
                    break;
                }
            case CodeTypes.Chinese:
                {
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    /// 
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    /// 保存方式.
    /// 保存的标识.
    public void CreateValidateCodeImage(int len, CodeTypes codetype, SaveTypes savetype, string savename)
    {
        this._Length = len;
        this.CodeType = codetype;
        this._SaveType = savetype;
        this._SaveName = savename;
        this.CreateValidateCodeImage();
    }

    /// 

    /// 创建验证码图片.
    /// 
    public void CreateValidateCodeImage()
    {
        //生成验证码.
        this.GetValidateCode();

        if (_Code.Trim() == "")
        {
            return;
        }

        System.Web.HttpContext.Current.Response.ContentType = "image/jpeg";

        //设置页面缓存过期时间为0.
        System.Web.HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
        System.Web.HttpContext.Current.Response.Expires = 0;

        //创建图片.
        System.Drawing.Bitmap ValidateImage = new System.Drawing.Bitmap(_Width, _Height);
        Graphics g = Graphics.FromImage(ValidateImage);

        try
        {
            //生成随机生成器 
            Random random = new Random();

            //清空图片背景色 
            g.Clear(Color.White);

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

                g.DrawLine(new Pen(Color.FromArgb(random.Next(255), random.Next(255), random.Next(255))), x1, y1, x2, y2);
            }

            Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
            System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, ValidateImage.Width, ValidateImage.Height), Color.Blue, Color.DarkRed, 1.2f, true);
            g.DrawString(_Code, font, brush, 2, 2);

            //画图片的前景噪音点 
            for (int i = 0; i < _Points; i++)
            {
                int x = random.Next(ValidateImage.Width);
                int y = random.Next(ValidateImage.Height);

                ValidateImage.SetPixel(x, y, Color.FromArgb(random.Next()));
            }

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

            //向页面输出图片.
            ValidateImage.Save(System.Web.HttpContext.Current.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        }
        finally
        {
            g.Dispose();
            ValidateImage.Dispose();
        }
    }


    /// 

    /// 验证码类型.
    /// 
    public enum CodeTypes
    {
        /// 

        /// 数字.
        /// 
        Number,
        /// 

        /// 字母.
        /// 
        Letter,
        /// 

        /// 字母数字组合.
        /// 
        LetterNumber,
        /// 

        /// 中文.
        /// 
        Chinese
    }

    /// 

    /// 验证码保存方式.
    /// 
    public enum SaveTypes
    {
        /// 

        /// 保存到Cookie.
        /// 
        Cookie,

        /// 

        /// 保存到Session.
        /// 
        Session
    }
}