protected void Page_Load(object sender, EventArgs e)
{
string checkCode = CreateRandomCode(4);
Session["CheckCode"] = checkCode;
CreateImage(checkCode);
}
//产生4个随即字符
private string CreateRandomCode(int codeCount)
{
string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";
string[] allCharArray = allChar.Split(','); //以","为分割符把allChar拆分成数据;
string randomCode = "";
int temp;
Random rand = new Random();
for (int i = 0; i < codeCount; i++)
{
int t = rand.Next(35);
temp = t;
randomCode += allCharArray[t];
}
return randomCode;
}
{
string checkCode = CreateRandomCode(4);
Session["CheckCode"] = checkCode;
CreateImage(checkCode);
}
//产生4个随即字符
private string CreateRandomCode(int codeCount)
{
string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";
string[] allCharArray = allChar.Split(','); //以","为分割符把allChar拆分成数据;
string randomCode = "";
int temp;
Random rand = new Random();
for (int i = 0; i < codeCount; i++)
{
int t = rand.Next(35);
temp = t;
randomCode += allCharArray[t];
}
return randomCode;
}
{
string checkCode = CreateRandomCode(4);//获取验证码文本
Session["CheckCode"] = checkCode;//将验证码保存到Session,以便其他页面调用
CreateImage(checkCode);//根据验证码文本生成验证码图片
}
//产生4个随即字符
private string CreateRandomCode(int codeCount)
{
string allChar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z";
string[] allCharArray = allChar.Split(','); //以","为分割符把allChar拆分成数据;
string randomCode = "";//用来保存生成随机验证码
int temp;//此句无用
Random rand = new Random();//定义rand,用来生成随机数
for (int i = 0; i < codeCount; i++)
{
int t = rand.Next(35);//生成0-35的随机数
temp = t;//无用,可去掉
randomCode += allCharArray[t];//随机数对应的字符添加到randomCode
}
return randomCode;//返回验证码
}
Session["CheckCode"] = checkCode;//保存到sesion
CreateImage(checkCode);//生成验证码图片
Random rand = new Random();//生成随机数Random r = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < codeCount; i++)
{
int t = rand.Next(35);//0-35
temp = t;
randomCode += allCharArray[t];
}