public bool VerifyCode(string cookie, string code)
{
var isOk = false;
try
{
if (string.IsNullOrEmpty(cookie) || string.IsNullOrEmpty(code))
{
isOk = false;
return(isOk);
}
var result = Des.Decrypt(cookie);
if (string.Equals(result.Result, code, StringComparison.CurrentCultureIgnoreCase))//忽略大小写比较
{
isOk = true;
}
}
catch (Exception)
{
return(isOk);
}
return(isOk);
}
/// <summary>
/// 生成二维码图片
/// </summary>
/// <param name="captchaCount"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public async Task <CaptchaInfo> CreateCaptcha(int captchaCount, int width, int height)
{
var model = new CaptchaInfo
{
ContentType = ContentType
};
var chars = new char[captchaCount];
var len = _characters.Count;
var random = new Random();
//随机生成验证码
for (var i = 0; i < chars.Length; i++)
{
var val = random.Next(len);
chars[i] = _characters[val];
}
var captcha = string.Join(string.Empty, chars); //取出验证码
model.Answer = await Des.Encrypt(captcha); //加密
//定义字体集合
var fontNames = new List <string>
{
"Helvetica", "Arial", "Lucida Family", "Verdana", "Tahoma", "Trebuchet MS", "Georgia", "Times"
};
// Bitmap 类 封装 GDI + 包含图形图像和其属性的像素数据的位图。 一个 Bitmap 是用来处理图像像素数据所定义的对象。
//Bitmap 类 继承自 抽象基类 Image 类
using (var bitmap = new Bitmap(width, height))
{
//Graphics 类 封装一个 GDI+ 绘图图面。
using (var graphics = Graphics.FromImage(bitmap))
{
///填充背景色
graphics.Clear(Color.White);
Disturb(random, bitmap, graphics, width / 2, height);
//添加灰色边框
var pen = new Pen(Color.Silver);
graphics.DrawRectangle(pen, 0, 0, width, height);
var x = 1;
var y = 5;
//定义一个矩形
var rectanngle = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
//随机颜色
//var color = Color.FromArgb(random.Next(110, 122), random.Next(110, 122), random.Next(110, 122));
foreach (var i in chars)
{
//随机选择字符 字体 大小
var fontName = fontNames[random.Next(0, fontNames.Count - 1)];
var font = new Font(fontName, random.Next(15, 20), FontStyle.Bold | FontStyle.Italic);
///渐变字符颜色
using (var brush = new LinearGradientBrush(rectanngle, Color.Blue, Color.DarkRed, 1.2f, true))
{
brush.SetSigmaBellShape(0.5f);
graphics.DrawString(i.ToString(), font, brush, x + random.Next(-2, 2), y + random.Next(-5, 5));
x = x + width / captchaCount;
}
}
using (var ms = new MemoryStream())
{
bitmap.Save(ms, ImageFormat.Jpeg);
model.Image = ms.ToArray();
return(model);
}
}
}
}
