后台生产验证码code和byte[]图片

引用命名空间

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;

 

 

生成方法

///

生成验证码
///

///
public string GetCheckCode()
{
int number;
char code;
string checkCode &＃61; String.Empty;

System.Random random &＃61; new Random();
do
{
number &＃61; random.Next();
if (number % 2 &＃61;&＃61; 0)
code &＃61; (char)(&＃39;0&＃39; &＃43; (char)(number % 10));
else
code &＃61; (char)(&＃39;A&＃39; &＃43; (char)(number % 26));
if (code &＃61;&＃61; &＃39;o&＃39; || code &＃61;&＃61; &＃39;O&＃39;) continue;
checkCode &＃43;&＃61; code.ToString();
} while (checkCode.Length <4);
//code储存.在session
KMHC.Infrastructure.SessionHelper.SetSession("checkCode", checkCode.ToUpper());

byte[] bytes &＃61; CreateValidateGraphic(checkCode.ToLower());
var response &＃61; new BaseResponse();
var src &＃61; "data:image/jpeg;base64," &＃43; Convert.ToBase64String(bytes);//Base64转换 HTML标签img 直接显示
return src;
}

///

/// 创建验证码的图片
///

///
///
public static byte[] CreateValidateGraphic(string checkCode)
{
Bitmap image &＃61; new Bitmap((int)Math.Ceiling(checkCode.Length * 13.5), 22);
Graphics g &＃61; Graphics.FromImage(image);
try
{
//生成随机生成器 
Random random &＃61; new Random();
//清空图片背景色 
g.Clear(Color.White);
//画图片的干扰线 
for (int i &＃61; 0; i <25; i&＃43;&＃43;)
{
int x1 &＃61; random.Next(image.Width); int x2 &＃61; random.Next(image.Width);
int y1 &＃61; random.Next(image.Height);
int y2 &＃61; random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font &＃61; new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush &＃61; new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(checkCode, font, brush, 3, 2);
//画图片的前景干扰点 
for (int i &＃61; 0; i <100; i&＃43;&＃43;)
{
int x &＃61; random.Next(image.Width); int y &＃61; random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线 
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//保存图片数据 
MemoryStream stream &＃61; new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片

return stream.ToArray();
}
finally
{
g.Dispose();
image.Dispose();
}
}