Random sj = new Random();//创建随机数
private void button1_Click(object sender, EventArgs e)
{ //定义一个字符串来接收验证码
string sjs = "";
//定义多种字体的数组
String[] ziti = { "Arial", "Verdana", "Comic Sans MS", "Impact", "Haettenschweiler", "Lucida Sans Unicode", "Garamond", "Courier New", "Book Antiqua", "Arial Narrow" };
for (int i = 0; i < 4; i++)
{ //判断大小写字母与数字
int pd = sj.Next(0, 3);
if (pd == 0)
{
sjs += sj.Next(0, 9).ToString();
}
else if (pd == 1)
{
sjs += ((char)sj.Next(65, 91)).ToString();//小写字母
}
else
{
sjs += ((char)sj.Next(97, 123)).ToString();//大写字母
}
}
**第一种方法直接通过索引取出**
//字符串数据,根据索引直接sjs[0]就可以取得字符串中第一个字符,以此类推,sjs[1]为字符串第二个字符
label1.Text = sjs[0].ToString();
label2.Text = sjs[1].ToString();
label3.Text = sjs[2].ToString();
label4.Text = sjs[3].ToString();
*第二种方法Split()函数*
string sjs = "";
for (int i = 0; i < 4; i++)
{
int pd = sj.Next(0, 3);
if (pd == 0)
{
sjs += sj.Next(0, 9).ToString()+"-";
}
else if (pd == 1)
{
sjs += ((char)sj.Next(65, 91)).ToString() + "-";
}
else
{
sjs += ((char)sj.Next(97, 123)).ToString() + "-";
}
}
//Split()分隔字符串为一个数组
string[] str = sjs.Split('-');
//根据索引来获取字符
label1.Text = str[0];
label2.Text = str[1];
label3.Text = str[2];
label4.Text = str[3];
**第三种方法Substring()函数**
string sjs = "";
for (int i = 0; i < 4; i++)
{
int pd = sj.Next(0, 3);
if (pd == 0)
{
sjs += sj.Next(0, 9).ToString();
}
else if (pd == 1)
{
sjs += ((char)sj.Next(65, 91)).ToString();
}
else
{
sjs += ((char)sj.Next(97, 123)).ToString();
}
}
//截取字符串 Substring()
// 将字符串进行截取
string sjs1 = sjs.Substring(0,1);
string sjs2 = sjs.Substring(1, 1);
string sjs3 = sjs.Substring(2, 1);
string sjs4 = sjs.Substring(3, 1);
label1.Text = sjs1;
label2.Text = sjs2;
label3.Text = sjs3;
label4.Text = sjs4;
//设置随机颜色
label1.ForeColor = Color.FromArgb(sj.Next(0, 255), sj.Next(0, 255), sj.Next(0, 255));
label2.ForeColor = Color.FromArgb(sj.Next(0, 255), sj.Next(0, 255), sj.Next(0, 255));
label3.ForeColor = Color.FromArgb(sj.Next(0, 255), sj.Next(0, 255), sj.Next(0, 255));
label4.ForeColor = Color.FromArgb(sj.Next(0, 255), sj.Next(0, 255), sj.Next(0, 255));
//设置随机字体与字体大小
label1.Font = new Font(ziti[sj.Next(9)], sj.Next(15, 30));
label2.Font = new Font(ziti[sj.Next(9)], sj.Next(15, 30));
label3.Font = new Font(ziti[sj.Next(9)], sj.Next(15, 30));
label4.Font = new Font(ziti[sj.Next(9)], sj.Next(15, 30));
}
}
}
C#实现随机验证码
猜你喜欢
转载自blog.csdn.net/weixin_44024993/article/details/105602797
今日推荐
周排行