/// <summary>
/// 英文字母 + 数字
/// </summary>
/// <param name="context">httpcontext</param>
/// <param name="sessionKey">保存运算值的SESSION的KEY</param>
/// <param name="fontSize">字体长度</param>
/// <param name="imgWidth">图片长度</param>
/// <param name="imgHeiht">图片高度</param>
/// <param name="stainLenght">噪音点长度</param>
/// <param name="codeLenght">随机码长度</param>
public static void Alphabet(HttpContext context, string sessionKey, int codeLenght = 4, int fontSize = 12, int imgWidth = 60, int imgHeiht = 20, int stainLenght = 30)
{
var code = string.Empty;
while (string.IsNullOrWhiteSpace(code) || code.Length != codeLenght)
{
code = Guid.NewGuid().ToString().Substring(0, codeLenght);
}
Cookies.Set(sessionKey, code);
ResponseImage(context, code, Color.White, fontSize, imgWidth, imgHeiht, stainLenght);
}
/// <summary>
/// 检测验证码是否正确
/// </summary>
/// <param name="sessionKey">保存到session的key</param>
/// <param name="code">用户输入的验证码</param>
public static bool Check(string sessionKey, string code)
{
if (string.IsNullOrWhiteSpace(code))
{
return(false);
}
var verifyCode = Cookies.Get(sessionKey);
Cookies.Set(sessionKey, Rand.GetRandom(10000, 99999));
return(code.Trim().IsEquals(verifyCode));
}
/// <summary>
/// 算术运算验证
/// </summary>
/// <param name="context">httpcontext</param>
/// <param name="sessionKey">保存运算值的SESSION的KEY</param>
/// <param name="fontSize">字体长度</param>
/// <param name="imgWidth">图片长度</param>
/// <param name="imgHeiht">图片高度</param>
/// <param name="stainLenght">噪音点长度</param>
public static void Arithmetic(HttpContext context, string sessionKey, int fontSize = 11, int imgWidth = 65, int imgHeiht = 23, int stainLenght = 10)
{
string expression = null;
var rnd = new Random();
// 生成3个10以内的整数，用来运算
var op1 = rnd.Next(0, 20);
var op2 = rnd.Next(0, 50);
var result = 0;
while (op1 > op2)
{
op1 = rnd.Next(0, 20);
op2 = rnd.Next(0, 10);
}
// 随机组合运算顺序，只做 + 运算
switch (rnd.Next(0, 2))
{
case 0:
{
result = op1 + op2;
expression = string.Format("{0} + {1} = ?", op1, op2);
break;
}
case 1:
{
result = op2 - op1;
expression = string.Format("{0} + ? = {1}", op1, op2);
break;
}
case 2:
{
result = op2 - op1;
expression = string.Format("? + {0} = {1}", op1, op2);
break;
}
}
Cookies.Set(sessionKey, result.ToString());
ResponseImage(context, expression, Color.White, fontSize, imgWidth, imgHeiht, stainLenght);
}
/// <summary>
/// 记住用户最后一次访问地址
/// </summary>
public static void RememberUrl()
{
Cookies.Set(SystemConfigs.ConfigInfo.Cookies_CallBack_Url, Req.GetUrl());
}
