c 验证码识别算法()

步骤1：创建一个类，用来生成验证码

步骤2：定义一个陵塌字典来存储验证码的值 ，存储字符及其册锋对应的装换码：
Dictionary verifyCode = new Dictionary();
("a", "25");
("b", "31");
("c", "45");
("d", "56");
步骤3：定义一个方法来生成验证码：
public string GenerateVerifyCode()
{

StringBuilder verifyBuilder = new StringBuilder();

Random random = new Random();
// 随机生成长度为4的验证码

for (int i = 0; i < 4; i++)

{

int index = ( - 1);

((index));

}

return ();
}
步骤4：定义一个方法来验证验证码：
public bool CheckVerifyCode(string verifyCode)
{

Dictionary verifyCode = new Dictionary();
("a", "25");

_("b", "州汪晌31");

_("c", "45");

_("d", "56");

StringBuilder verifyBuilder = new StringBuilder();

// 验证输入的验证码是否正确

foreach (char c in verifyCode)

{

if (!_(c))

{

return false;

}

}

return true;
}