不管是窗體應用程式還是Web應用程式，驗證碼是經常用到的東西，為了友善我也寫了個驗證碼類，分享一下，互相學習。
先看下代碼，最後再看效果，代碼如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace winform驗證碼
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//-------------這個就是最後的驗證碼的結果-------------
string ther = null;
void getyzm()
{
//初始化驗證碼
MYYZM yzm = new MYYZM(0, MYYZM.CodeType.Romdom, false);
//生成顯示驗證碼圖像
pictureBox1.Image = Bitmap.FromStream(yzm.CreateCheckCodeImage(out ther));
}
private void Form1_Load(object sender, EventArgs e)
{
//1、窗體啟動時産生驗證碼
getyzm();
}
private void pictureBox1_Click(object sender, EventArgs e)
{
//2、點選驗證碼時更換
getyzm();
}
private void button1_Click(object sender, EventArgs e)
{
//3、判斷驗證碼正誤
string inputstr = textBox1.Text;
if(inputstr.Equals(ther))
{
MessageBox.Show("正确！");
}
else
{
MessageBox.Show("錯誤！");
}
}
public class MYYZM
{
#region 私有字段
private const double PI = 3;
private const double PI2 = 6;
//驗證碼區分大小寫
private bool _qfdxx;
//驗證碼字元數量
private int _len;
//驗證碼類型
private CodeType _codetype;
private readonly Single _jianju = (float)18.0;
private readonly Single _height = (float)24.0;
private string _checkCode;
private string _checkResult;
//左空隙
private int leftspace = 10;
#endregion
#region 屬性
public string MYYZMcode
{
get
{
return _checkCode;
}
}
#endregion
#region 構造函數
/// <summary>
/// public constructors
/// </summary>
/// <param name="len"> 驗證碼長度 </param>
/// <param name="ctype"> 驗證碼類型：字母、數字、字母+ 數字、算數 </param>
public MYYZM(int len, CodeType ctype, bool qfdxx)
{
_qfdxx = qfdxx;
Random random = new Random();
if (len == 0)
{
_len = random.Next(4, 7);
}
else
{
this._len = len;
}
if (ctype == CodeType.Romdom)
{
int n = random.Next(1, 6);
switch (n)
{
case 1:
this._codetype = CodeType.Alphas;
break;
case 2:
this._codetype = CodeType.Characters;
break;
case 3:
this._codetype = CodeType.Numbers;
break;
case 4:
this._codetype = CodeType.Words;
break;
case 5:
this._codetype = CodeType.SuanShu;
break;
default:
this._codetype = CodeType.Alphas;
break;
}
}
else
{
this._codetype = ctype;
}
}
#endregion
#region 共有變量
/// <summary>
/// ?驗證碼類型：字母、數字、字母+ 數字
/// </summary>
public enum CodeType { Romdom, Words, Numbers, Characters, Alphas, SuanShu }
#endregion
#region 私有方法
private string GenerateNumbers()
{
string strOut = "";
System.Random random = new Random();
for (int i = 0; i < _len; i++)
{
string num = Convert.ToString(random.Next(10000) % 10);
strOut += num;
}
return strOut.Trim();
}
private string GenerateCharacters()
{
string strOut = "";
System.Random random = new Random();
for (int i = 0; i < _len; i++)
{
string num = Convert.ToString((char)(65 + random.Next(10000) % 26));
strOut += num;
}
return strOut.Trim();
}
//
private string GenerateAlphas()
{
string strOut = "";
string num = "";
System.Random random = new Random();
for (int i = 0; i < _len; i++)
{
if (random.Next(500) % 2 == 0)
{
num = Convert.ToString(random.Next(10000) % 10);
}
else
{
num = Convert.ToString((char)(65 + random.Next(10000) % 26));
}
strOut += num;
}
return strOut.Trim();
}
private string GenerateSuanShu()
{
string strOut = "";
System.Random random = new Random();
int a = random.Next(1, 10);
int b = random.Next(1, 10);
if (a < b)
{
int t = a;
a = b; ; b = t;
}
string fh = "+";
int jiajian = random.Next(1, 3);
if (jiajian == 1)
{
fh = "-";
_checkResult = (a - b).ToString();
}
else
{
fh = "+";
_checkResult = (a + b).ToString();
}
strOut = a + fh + b;
return strOut.Trim();
}
private System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
// 将位圖背景填充為白色
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
graph.Dispose();
double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
for (int i = 0; i < destBmp.Width; i++)
{
for (int j = 0; j < destBmp.Height; j++)
{
double dx = 0;
dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = Math.Sin(dx);
// 取得目前點的顔色
int nOldX = 0, nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
nOldY = bXDir ? j : j + (int)(dy * dMultValue);
System.Drawing.Color color = srcBmp.GetPixel(i, j);
if (nOldX >= 0 && nOldX < destBmp.Width
&& nOldY >= 0 && nOldY < destBmp.Height)
{
destBmp.SetPixel(nOldX, nOldY, color);
}
}
}
return destBmp;
}
#endregion
#region 共有方法
/// <summary>
/// 産生驗證碼的方法
/// </summary>
/// <returns></returns>
public Stream CreateCheckCodeImage(out string MYYZMCode)
{
string checkCode;
switch (_codetype)
{
case CodeType.Alphas:
checkCode = GenerateAlphas();
break;
case CodeType.Numbers:
checkCode = GenerateNumbers();
break;
case CodeType.Characters:
checkCode = GenerateCharacters();
break;
case CodeType.SuanShu:
checkCode = GenerateSuanShu();
break;
default:
checkCode = GenerateAlphas();
break;
}
if (_codetype == CodeType.SuanShu)
{
_checkCode = _checkResult;
}
else
{
_checkCode = checkCode;
}
if (_qfdxx) //區分大小寫
{
MYYZMCode = _checkCode;
}
else
{
_checkCode = _checkCode.ToLower();
MYYZMCode = _checkCode.ToLower();
}
MemoryStream ms = null;
//
if (checkCode == null || checkCode.Trim() == String.Empty)
return null;
Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * _jianju) + leftspace + leftspace), (int)_height);
Graphics g = Graphics.FromImage(image);
try
{
Random random = new Random();
g.Clear(Color.Yellow);
// 畫圖檔的背景噪音線
for (int i = 0; i < 18; 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.FromArgb(random.Next()), 1), x1, y1, x2, y2);
}
Font font = new System.Drawing.Font("Times New Roman", 15, System.Drawing.FontStyle.Bold);
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width + leftspace, image.Height), Color.Black, Color.DarkRed, 1.2f, true);
if (_codetype != CodeType.Words)
{
for (int i = 0; i < checkCode.Length; i++)
{
g.DrawString(checkCode.Substring(i, 1), font, brush, (2 + i * _jianju) + leftspace, 1);
}
}
else
{
g.DrawString(checkCode, font, brush, 2, 2);
}
// 畫圖檔的前景噪音點
for (int i = 0; i < 150; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
// 畫圖檔的波形濾鏡效果
if (_codetype != CodeType.Words)
{
image = TwistImage(image, true, 3, 1);
}
// 畫圖檔的邊框線
g.DrawRectangle(new Pen(Color.Green), 0, 0, image.Width - 1, image.Height - 1);
ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
}
finally
{
g.Dispose();
image.Dispose();
}
return ms;
}
#endregion
}
}
} 說明：
getyzm();就是産生及重新整理驗證碼的方法
用使用者輸入與 ther 對比來判斷驗證碼是否正确。
效果如下：
